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Contents
- The climate of East Helena
- The best time to visit East Helena
- The worst time to visit East Helena
- Spring weather in East Helena
- Summer weather in East Helena
- Autumn weather in East Helena
- Winter weather in East Helena
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of East Helena
East Helena, located in the state of Montana, USA, falls within the BSk category or Mid-latitude steppe according to the Köppen climate classification. This climate categorization evidences the dominantly dry conditions accompanied by a wide range of temperatures.
Throughout the year, month-to-month fluctuations in various weather parameters are pronounced. Average high temperatures range from 27.7°F (-2.4°C) in December to 80.2°F (26.8°C) in July, presenting a significant thermal contrast. Concurrently, average low temperatures differ from the chilliest 14.2°F (-9.9°C) in December to more comfortable 50.4°F (10.2°C) during July. A marked relative humidity transition from 85% in January to its low point at 46% in July and August reveals the variance in moisture content in the air.
Rain is not an everyday occurrence, but the range of average monthly rainfall is relatively tight, varying from 0.63" (16mm) in January and December to a slightly wetter 2.01" (51mm) in June. Exposure to sunlight changes drastically during the year with East Helena enjoying 5.6 hours of sunshine per day on average in January, peaking at 11.7 hours in July. Snowfall is prominent during the colder months, with February witnessing the highest snowfall of 6.18" (157mm).
Throughout the year, month-to-month fluctuations in various weather parameters are pronounced. Average high temperatures range from 27.7°F (-2.4°C) in December to 80.2°F (26.8°C) in July, presenting a significant thermal contrast. Concurrently, average low temperatures differ from the chilliest 14.2°F (-9.9°C) in December to more comfortable 50.4°F (10.2°C) during July. A marked relative humidity transition from 85% in January to its low point at 46% in July and August reveals the variance in moisture content in the air.
Rain is not an everyday occurrence, but the range of average monthly rainfall is relatively tight, varying from 0.63" (16mm) in January and December to a slightly wetter 2.01" (51mm) in June. Exposure to sunlight changes drastically during the year with East Helena enjoying 5.6 hours of sunshine per day on average in January, peaking at 11.7 hours in July. Snowfall is prominent during the colder months, with February witnessing the highest snowfall of 6.18" (157mm).
The best time to visit East Helena
The best time to visit East Helena is from late spring through summer, namely May through August. These months are warm, with average high temperatures reaching from 59.4°F (15.2°C) to 80.2°F (26.8°C). Relative humidity is at its lowest, below 50% in July and August, making the warm temperatures pleasant rather than oppressive. Sunshine hours are also at their annual peak during this period, with between 11.1 hours and 11.7 hours of daylight daily. Rainfall is relatively low, particularly in July and August with less than 1 inch, offering a less disrupted outdoor experience.
The worst time to visit East Helena
Visitors are advised to avoid the colder months from November to February when conditions are at their harshest. Average high temperatures remain below freezing from 27.7°F (-2.4°C) to 39.7°F (4.3°C), and the lows plummet to between 14.2°F (-9.9°C) and 23.2°F (-4.9°C). Snowfall measurements average from 4.29" (109mm) to 6.18" (157mm) per month, further intensifying the cold sensation. The number of sunshine hours is at its lowest during this period, ranging from 5.8 to 7 hours per day, constraining outdoor activities.
Spring weather in East Helena
In the spring months between March and May, the weather in East Helena starts to warm. Average high temperatures rise from 39.7°F (4.3°C) in March to 59.4°F (15.2°C) by May, while the lows ascend from 23.2°F (-4.9°C) to 36.9°F (2.7°C). Although it is a transition season, spring witnesses increased rainfall with values ranging from 1.1" (28mm) in March to 1.5" (38mm) in May. The length of daylight extends from 12 hours in March to 15 hours by May, providing more opportunities to explore the locale.
Summer weather in East Helena
From June to August, the weather in East Helena is at its warmest and driest. Average high temperatures maintain between 69.4°F (20.8°C) and 80.2°F (26.8°C), while lows keep between 44.2°F (6.8°C) and 50.4°F (10.2°C). Summer offers the longest daylight duration with up to 15.8 hours in June, decreasing slightly to 14.1 hours by August. Rainfall declines during this season, from the highest 2.01" (51mm) in June tapering to 0.87" (22mm) in August.
Autumn weather in East Helena
The autumn in East Helena from September to November brings cooler temperatures and increased rainfall. Average high temperatures drop from 68.2°F (20.1°C) in September down to a chilly 37.4°F (3°C) by November. Correspondingly, average low temperatures decline from 43.9°F (6.6°C) to 22.1°F (-5.5°C) within this period. Rainfall also elevates with 0.94" (24mm) in September, up to 0.71" (18mm) in November. Daylight hours shrink from 12.5 hours in September to a mere 9.4 hours by November, marking the season's end.
Winter weather in East Helena
In winter from December to February, East Helena faces its coldest temperatures. Average highs range from 27.7°F (-2.4°C) in December to a slightly milder 30.4°F (-0.9°C) in January. Low temperatures present even more severe cold, staying between 14.2°F (-9.9°C) and 16°F (-8.9°C). This season also witnesses the highest snowfall, averaging from 4.41" (112mm) in December, peaking at 6.18" (157mm) in February. Sunshine hours dwindle, delivering just 5.6 hours of daylight in December, reaching 6 hours by February.
Weather in January
East Helena, Montana starts the year with a chilly atmosphere where snowfall happens on about 13.3 days, accumulating 4.41" (112mm) of snow in this month. January's weather conditions are marked with a quiet and steady rhythm, transforming the cityscape into a white winter wonderland. Weather in January »
Weather in February
Winter in East Helena continues into February, albeit with an increase in snowfall to 6.18" (157mm) compared to January. The month’s lower temperatures and high snowfall make it an ideal time for winter expeditions. Yet, the shorter daylight hours might require careful planning. Weather in February »
Weather in March
By March, East Helena, Montana starts to show signs of spring. Warmer than the two previous months, it still keeps a winter coat, recording 5.12" (130mm) of snow over 11.7 days. Therefore, the anticipation of spring intermixes with the last traces of winter, especially in the earlier part of the month. Weather in March »
Weather in April
April in East Helena, Montana is a transition month with a noticeable increase in daylight hours. Although the last vestiges of winter persist with a snowfall of 5.12" (130mm), they are fading, giving way to spring. Milder temperatures allow the city to show signs of waking up from its long winter slumber. Weather in April »
Weather in May
As spring hits its stride in May, East Helena, Montana is met with mild weather, leaving only a trace of snow at 0.67" (17mm). May signifies a time of renewal with greener landscapes and an increase in outdoor activities. Pleasant weather reigns supreme as the city fully embraces the spring season. Weather in May »
Weather in June
In East Helena, Montana, June is a graceful and mild start to the summer. Living up to its reputation, June doesn't record any snowfall, a trend that continues until August. With summer finally arriving, it's a time of jovial backyard barbecues and refreshing dips in the local lakes. Weather in June »
Weather in July
July is the heart of summer in East Helena, Montana with long sunny days featuring a peak average temperature of 80.2°F (26.8°C). While outdoor activities reach their zenith, residents also enjoy the relief of cooler evenings. The blue Montana skies, with a minimum cloud percentage, offer perfect conditions for outdoor pursuits. Weather in July »
Weather in August
August, similar to July, allows summer to continue its reign in East Helena, Montana, despite a slight dip in the maximum temperature to 78.1°F (25.6°C). As the last full month of summer, it is a celebration of its joys. The long, sunny days invite the residents outside for adventure and relaxation. Weather in August »
Weather in September
September in East Helena, Montana sees the beginning of fall, despite a late summer feel with the temperature still reaching up to 68.2°F (20.1°C). The vibrancy of summer slowly transforms into the calmness of autumn. A slight chill starts to touch the morning and evening air. Weather in September »
Weather in October
October in East Helena, Montana brings the full essence of autumn, characterized by slightly cooler weather and beautiful fall foliage. As the city prepares for the upcoming winter, residents cherish the comfortable mix of sunny days and crisp evenings. Weather in October »
Weather in November
November in East Helena, Montana is a prelude to the winter, with its first notable snowfall of 4.29" (109mm) indicating a move towards colder weather. As the last month of fall, it retains a portion of its autumnal charm infused with a winter ambiance. Weather in November »
Weather in December
Wrapping up the year, December in East Helena, Montana welcomes the full onset of winter with an average snowfall of 4.61" (117mm). The winter scenery of East Helena transforms the city into a winter wonderland. As the year draws to a close, the city embraces the winter charm and festive spirit, signifying the end of a cycle. Weather in December »
[Resources]Frequently asked questions
What is the most humid month in East Helena?
With an average relative humidity of 85%, January is the most humid month in East Helena, Montana.
What is the driest month in East Helena?
January and December are months with the least rain in East Helena, Montana, when the rain falls for 8.4 days and typically aggregates up to 0.63" (16mm) of rain.
How much does it rain in East Helena?
Throughout the year, in East Helena, Montana, there are 123.7 rainfall days, and 12.4" (315mm) of precipitation is accumulated.
When does it snow in East Helena?
Months with snowfall in East Helena are January through May, September through December.
How much does it snow in East Helena?
Throughout the year, in East Helena, Montana, there are 80.4 snowfall days, and 34.88" (886mm) of snow is accumulated.
What is the month with the least sunshine in East Helena?
With an average of 5.6h of sunshine, January has the least sunshine of the year.
What is the snowiest month in East Helena?
The month with the most snowfall is February, when snow falls for 16.2 days and typically aggregates up to 6.18" (157mm) of snow.
When is the lowest UV index in East Helena?
The month with the lowest UV index is February, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in East Helena?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
What is the wettest month in East Helena?
The month with the most rainfall in East Helena is June, when the rain falls for 13.3 days and typically aggregates up to 2.01" (51mm) of precipitation.
When it does not snow in East Helena?
In East Helena, Montana, snow does not fall in June through August.
When are the longest days in East Helena?
June has the longest days of the year, with an average of 15h and 48min of daylight.
What part of the year is the hottest in East Helena?
July, marked by an average high-temperature of 80.2°F (26.8°C) and a low-temperature of 50.4°F (10.2°C), is the warmest month in East Helena.
What are the least humid months in East Helena?
July and August, with an average relative humidity of 46%, are the least humid months in East Helena, Montana.
What month has the most sunshine in East Helena?
July has the most sunshine of the year in East Helena, with an average of 11.7h of sunshine.
What is the month with the highest UV index in East Helena?
With an average maximum UV index of 6, July is the month with the highest UV index in East Helena, Montana.
What part of the year is the coldest in East Helena?
With average high temperatures of 27.7°F (-2.4°C) and lows of 14.2°F (-9.9°C), December is the coldest month in East Helena, Montana.
What is the month with the shortest days in East Helena?
With an average of 8h and 36min of daylight, December has the shortest days of the year.
Average temperature
East Helena, MT
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).
Average pressure
East Helena, MT
- Average pressure in January:
30.18"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.17"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
East Helena, MT
- Average wind speed in January:
7mph - Average wind speed in February:
6.5mph - Average wind speed in March:
6.6mph - Average wind speed in April:
6.9mph - Average wind speed in May:
5.8mph - Average wind speed in June:
6mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
5mph - Average wind speed in September:
5.9mph - Average wind speed in October:
6.7mph - Average wind speed in November:
7.1mph - Average wind speed in December:
6.8mph
The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity
East Helena, MT
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall
East Helena, MT
- Average rainfall in January:
0.63" - Average rainfall in February:
0.87" - Average rainfall in March:
1.1" - Average rainfall in April:
1.5" - Average rainfall in May:
1.5" - Average rainfall in June:
2.01"
- Average rainfall in July:
0.83" - Average rainfall in August:
0.87" - Average rainfall in September:
0.94" - Average rainfall in October:
0.83" - Average rainfall in November:
0.71" - Average rainfall in December:
0.63"
The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").
Average rainfall days
East Helena, MT
- Average rainfall days in January:
8.4 days - Average rainfall days in February:
7.4 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
15.1 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
8.8 days - Average rainfall days in August:
9.1 days - Average rainfall days in September:
8.1 days - Average rainfall days in October:
10 days - Average rainfall days in November:
7 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).
Average snowfall
East Helena, MT
- Average snowfall in January:
4.41" - Average snowfall in February:
6.18" - Average snowfall in March:
5.12" - Average snowfall in April:
5.12" - Average snowfall in May:
0.67" - Average snowfall in June:
0"
The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").
Average snowfall days
East Helena, MT
- Average snowfall days in January:
13.3 days - Average snowfall days in February:
16.2 days - Average snowfall days in March:
11.7 days - Average snowfall days in April:
8.8 days - Average snowfall days in May:
1.3 days - Average snowfall days in June:
0.2 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.7 days - Average snowfall days in October:
4.6 days - Average snowfall days in November:
9.5 days - Average snowfall days in December:
14.1 days
The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
East Helena, MT
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
6h and 0min - Average sunshine in March:
7h and 5min - Average sunshine in April:
9h and 1min - Average sunshine in May:
10h and 2min - Average sunshine in June:
11h and 1min
- Average sunshine in July:
11h and 4min - Average sunshine in August:
11h and 3min - Average sunshine in September:
9h and 4min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days
East Helena, MT
- Average sunshine days in January:
15.2 days - Average sunshine days in February:
10.4 days - Average sunshine days in March:
11 days - Average sunshine days in April:
9.8 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
14.2 days
- Average sunshine days in July:
20.5 days - Average sunshine days in August:
19.5 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
17.2 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).
Average UV index
East Helena, MT
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover
East Helena, MT
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility
East Helena, MT
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
East Helena, Montana, USA
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