Climate and monthly weather forecastLewistown, MT
Climate and monthly weather forecast
The climate of Lewistown
Perched in the geographical region of Montana, USA, Lewistown experiences a specific weather condition known as the Humid continental climate type, with no dry season, and a warm summer according to the Köppen climate classification, indicated as Dfb. In a year, Lewistown's temperature shows a wide variety, with the highest temperature reaching 78.8°F (26°C) in July and the coolest dropping to 15.3°F (-9.3°C) in February. Rainfall is present throughout the year, with May receiving the highest precipitation of 3.39" (86mm) annually.The lush, green city experiences dramatic differences between its dry and wet seasons. While August has the lowest humidity with 47%, February has a relatively higher percentage at 79%. Snowfall is also a regular occurrence with the highest recorded in April, measuring up to 9.13" (232mm) while the lowest traces of snow are spotted in June and July. Additionally, varied tendencies in hourly sunshine are noticed throughout the year with a peak of 15.8 hours in June and a dip to 8.6 hours in December.
Lewistown's weather conditions exhibit a unique pattern in wind speed and atmospheric pressure. The winds blow at their highest during November and April with a speed of 9.9mph (15.9km/h) whereas during August, the winds slow down to 7.4mph (11.9km/h). The atmospheric pressure varies from a high of 30.13" (765mm) in January to a low of 29.85" (758mm) in June.
The best time to visit Lewistown
To make the most out of a visit to Lewistown, July stands out as the most fitting month. It is during this period that the city experiences warmest temperatures reaching upto 78.8°F (26°C) accompanied by the longest period of sunshine with 11.8 hours daily. Despite being the peak of summer, the relative humidity drops to 51%, providing a perfect balance of warmth and comfort for explorers. In addition, there is a minimal likelihood of rainfall with only 1.06" (27mm) expected throughout July.The worst time to visit Lewistown
February proves to be a challenging month for travelers due to the harsh winter conditions. With the lowest temperatures reaching a chilly 15.3°F (-9.3°C), one can expect to face the cold hands of winter. Snowfall is also significant during this time with up to 6.65" (169mm) of snow expected. The days are short with just 10.3 hours of daylight and the route visibility might also be impacted by the reduced visibility of 6 miles, making outdoor activities difficult.Spring weather in Lewistown
March to May marks the time of Spring in Lewistown with temperatures ranging from 25.3°F (-3.7°C) to 58.5°F (14.7°C). March sees a higher snowfall of 5.63" (143mm), whereas it fades off in May to a mere 2.48" (63mm), making way for a greener landscape. Rainfall during the spring months incrementally increases, reaching its annual peak in May with 3.39" (86mm) of rainfall on average. This period also sees a rise in the number of sunshine hours, creating a pleasant atmosphere.Summer weather in Lewistown
The summer months from June to August in Lewistown present a warm and agreeable climate. The temperatures range from 47.8°F (8.8°C) in June to a peak of 78.8°F (26°C) in July. The rainfall decreases during this period, with August experiencing 1.34" (34mm) on average. With less rainfall, the humidity also falls to 47%, creating dry and comfortable conditions. These months offer a long span of daylight, with 15.8 hours in June, making it ideal for various outdoor activities.Autumn weather in Lewistown
Autumn in Lewistown, from September to November, witnesses falling temperatures, starting from 67.5°F (19.7°C) in September and dropping to 39.2°F (4°C) in November. Rainfall is relatively moderate, averaging between 1.02" (26mm) and 1.22" (31mm) over the autumn months. While September sees minimal snowfall, November sees a substantial increase to 5.31" (135mm), hinting the start of the winter season.Winter weather in Lewistown
Winter, spanning from December to February, showcases cold and snowy conditions in Lewistown. The temperatures drop rapidly, ranging from 29.1°F (-1.6°C) to 16.9°F (-8.4°C). These months are characterized by frequent snowfall, with an average snowfall of 6.65" (169mm) in February. While daylight hours decrease to 8.6 hours in December, the humidity rises, reaching 79% in February— the highest throughout the year.Weather in January
January gifts Lewistown, Montana a surprising blend of icing conditions with the lower temperatures stooping to 16.9°F (-8.4°C) and the maximum being 30.6°F (-0.8°C). The city experiences more snowy days compared to rainy, establishing a frosty yet cardinal winter climate. Weather in January »Weather in February
February infers a continuation of winter's reign with the mercury dipping to 15.3°F (-9.3°C), the lowest of the year, capped at 29.1°F (-1.6°C) causing a chillier environment than in previous January. Notable conditions include an increase in snowfall to 6.65" (169mm), emphasizing the persistent winter chills. Weather in February »Weather in March
March brings a respite from the intense cold as Lewistown moves towards spring, with temperatures rising considerably compared to February. A distinct rise in rainfall of 1.14" (29mm) signals the shifting weather conditions. The appearance of the sun's rays becomes more regular, providing slightly longer days compared to the last month. Weather in March »Weather in April
April greets Lewistown with a transition from early spring to a more mature version of the season. Notably, there’s an abrupt upward trend in the city’s downpour, recording 2.36" (60mm) as gusty winds pave the way for heavy rainstorms. Weather in April »Weather in May
May signifies a period of increased weather activity with the transition of seasons. With temperatures ascending to 58.5°F (14.7°C), indicating a significant departure from April, the warmth becomes noticeable. A peak rainfall volume of 3.39" (86mm) documents the heaviest downpour for the year. Weather in May »Weather in June
June marks the advent of summer in Lewistown with higher temperatures compared to May peaking at 68.5°F (20.3°C). The trend shifts towards drier weather with a drop in rainfall to 2.83" (72mm). Longer sunshine duration, extending to the max of 11.1 hours daily, encapsulates the quintessential summer attributes. Weather in June »Weather in July
July stages the peak of summer in Lewistown sporting the highest temperature, reaching 78.8°F (26°C). Experiencing the sunshine around 11.8 hours daily, most of any month, reflects the climax of the sun’s reign. The month also showcases a minimal number of rainy days and an overall drop in humidity from June, resonating with the summer spirit. Weather in July »Weather in August
August in Lewistown experiences a mild decline in temperature, peaking at 78.1°F (25.6°C), indicating soft whispers of a nearing fall. Noticeably, rainfall inches up to 1.34, offering a slight relief from the dry spell. A declining trend in daylight and Sunshine hours reinstates the coming shift in seasons. Weather in August »Weather in September
September is a portal from summer to fall, with a noticeable dip in temperatures from August, manifesting the onset of autumn. A highlight is that snow makes a comeback with the city receiving 1.3" (33mm), the first in four months. Weather in September »Weather in October
October introduces Lewistown to a full-fledged autumn as temperatures continue to descend from September values. Snowfall shows a significant jump with the city getting blanketed with 4.61" (117mm), staging a winter preview. The shorter daylight hours, along with fewer sunshine hours, cater to the wintry sensation. Weather in October »Weather in November
November takes a step closer to winter with temperatures reducing significantly from October. Snowfall sees an increase by collecting 5.31" (135mm), gently hinting at the coming winter. The general decrease in daylight hours, coupled with slightly fewer sunshine hours, presents ordinary autumn traits. Weather in November »Weather in December
December welcomes winter again in Lewistown with temperatures dropping off to a chilly 29.1°F (-1.6°C), reverting to the weather state from the start of the year. An increased snowfall reaching 4.88" (124mm) and more snowy days mark the full-fledged arrival of winter. Weather in December »Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.
Months with snowfall are January through June, September through December.
In Lewistown, during the entire year, snow falls for 83.4 days and aggregates up to 45.51" (1156mm) of snow.
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2.
During February and December, Lewistown experiences its lowest temperatures, averaging a high-temperature of 29.1°F (-1.6°C).
With an average relative humidity of 79%, February is the most humid month.
February has the least sunshine of the year, with an average of 5.5h of sunshine.
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.
The month with the most snowfall is April, when snow falls for 10 days and typically aggregates up to 9.13" (232mm) of snow.
The month with the most rainfall is May, when the rain falls for 19.3 days and typically aggregates up to 3.39" (86mm) of precipitation.
With an average of 15h and 48min of daylight, June has the longest days of the year in Lewistown.
July stands out as Lewistown's warmest month, with an average high-temperature of 78.8°F (26°C) and a low-temperature of 54.3°F (12.4°C).
July and August are months without snowfall.
The month with the most sunshine is July, with an average of 11.8h of sunshine.
With an average maximum UV index of 6, July is the month with the highest UV index.
August is the least humid month in Lewistown, with an average relative humidity of 47%.
The month with the least rainfall is December, when the rain falls for 6 days and typically collects 0.71" (18mm) of precipitation.
With an average of 8h and 36min of daylight, December has the shortest days of the year.
Average temperature
Lewistown, MT
The warmest month (with the highest average high temperature) is July (78.8°F).
The months with the lowest average high temperature are February and December (29.1°F).
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure
Lewistown, MT
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.85"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Lewistown, MT
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.1mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.8mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
7.6mph - Average wind speed in August:
7.4mph - Average wind speed in September:
8.5mph - Average wind speed in October:
9.9mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.5mph
The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity
Lewistown, MT
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).
Average rainfall
Lewistown, MT
- Average rainfall in January:
0.83" - Average rainfall in February:
0.98" - Average rainfall in March:
1.14" - Average rainfall in April:
2.36" - Average rainfall in May:
3.39" - Average rainfall in June:
2.83"
- Average rainfall in July:
1.06" - Average rainfall in August:
1.34" - Average rainfall in September:
1.02" - Average rainfall in October:
1.22" - Average rainfall in November:
0.94" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days
Lewistown, MT
- Average rainfall days in January:
5.4 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
10.4 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
19.3 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
11.2 days - Average rainfall days in August:
10.5 days - Average rainfall days in September:
8.7 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
6 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).
Average snowfall
Lewistown, MT
- Average snowfall in January:
5.47" - Average snowfall in February:
6.65" - Average snowfall in March:
5.63" - Average snowfall in April:
9.13" - Average snowfall in May:
2.48" - Average snowfall in June:
0.04"
The month with the highest snowfall is April (9.13").
The months with the least snowfall are July and August (0").
Average snowfall days
Lewistown, MT
- Average snowfall days in January:
12.9 days - Average snowfall days in February:
15.2 days - Average snowfall days in March:
12.7 days - Average snowfall days in April:
10 days - Average snowfall days in May:
2.4 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:
1 days - Average snowfall days in October:
6.1 days - Average snowfall days in November:
9.4 days - Average snowfall days in December:
13.5 days
The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Lewistown, MT
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 48min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 36min
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 42min - Average sunshine in February:
5h and 30min - Average sunshine in March:
7h and 36min - Average sunshine in April:
9h and 0min - Average sunshine in May:
10h and 0min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 24min - Average sunshine in September:
10h and 0min - Average sunshine in October:
6h and 30min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days
Lewistown, MT
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
10.5 days - Average sunshine days in April:
8.3 days - Average sunshine days in May:
8.9 days - Average sunshine days in June:
9.9 days
- Average sunshine days in July:
16.6 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
16.8 days - Average sunshine days in December:
16 days
The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).
Average UV index
Lewistown, MT
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover
Lewistown, MT
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility
Lewistown, MT
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
