Climate and monthly weather forecastHelena, MO
Climate and monthly weather forecast
Weather in January
January, the same as December, is an icy winter month in Helena, Missouri, with an average temperature ranging between min 20.3°F (-6.5°C) and max 34.2°F (1.2°C). The month of January sees the lowest average temperatures, reaching 34.2°F (1.2°C) at the peak and 20.3°F (-6.5°C) at the low. Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Helena, Missouri, with an average temperature varying between 38.3°F (3.5°C) and 23.5°F (-4.7°C). The shift from January to February is characterized by an average high-temperature of a still icy 38.3°F (3.5°C), not significantly different from the 34.2°F (1.2°C) of January. Weather in February »Weather in March
The first month of the spring, March, is a cool month in Helena, Missouri, with an average temperature ranging between max 52°F (11.1°C) and min 35.2°F (1.8°C). As March begins, there is an increase in the average high-temperature, moving from a cold 38.3°F (3.5°C) in February to a fresh 52°F (11.1°C). Weather in March »Weather in April
April in Helena, Missouri, is a comfortable spring month, with temperature in the range of an average low of 44.4°F (6.9°C) and an average high of 62.8°F (17.1°C). The shift into April brings an increase in the average high-temperature, moving from a cool 52°F (11.1°C) in March to a refreshing 62.8°F (17.1°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Helena, Missouri, with an average temperature varying between 72.1°F (22.3°C) and 55.2°F (12.9°C). As May arrives, Helena's weather shows an increase in high-temperatures, moving from April's comfortable 62.8°F (17.1°C) to an agreeable 72.1°F (22.3°C). Weather in May »Weather in June
June, the first month of the summer in Helena, is a moderately hot month, with an average temperature ranging between max 82.6°F (28.1°C) and min 64.9°F (18.3°C). June comes with an increase, with the average high-temperature moving from a pleasant 72.1°F (22.3°C) in May to a warm 82.6°F (28.1°C). Weather in June »Weather in July
July, like June, in Helena, Missouri, is a moderately hot summer month, with an average temperature fluctuating between 67.6°F (19.8°C) and 85.5°F (29.7°C). In Helena, Missouri, the peak average temperatures are observed in July, with a high of 85.5°F (29.7°C) and a low of 67.6°F (19.8°C). The average heat index in July is evaluated at a fiery hot 96.8°F (36°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Helena, Missouri, with an average temperature varying between 83.8°F (28.8°C) and 64.6°F (18.1°C). A minor adjustment in Helena's average high-temperature is noted with the start of August, touching a still moderately hot 83.8°F (28.8°C) from July's 85.5°F (29.7°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Helena, Missouri, with an average temperature ranging between max 77.5°F (25.3°C) and min 57.9°F (14.4°C). The onset of September aligns with a soft reduction in the average high-temperature, gently falling from 83.8°F (28.8°C) in August to a still warm 77.5°F (25.3°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Helena, Missouri, with an average temperature varying between 46.4°F (8°C) and 63.5°F (17.5°C). The decrease of average high-temperatures is mild in October, with a decline from a moderately hot 77.5°F (25.3°C) in September to a refreshing 63.5°F (17.5°C). Weather in October »Weather in November
November, the last month of the autumn in Helena, is also a fresh month, with an average temperature ranging between max 50.9°F (10.5°C) and min 35.1°F (1.7°C). Stepping into November, Helena observes a temperature decline, with the average high falling from October's comfortable 63.5°F (17.5°C) to a fresh 50.9°F (10.5°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Helena, Missouri, with an average temperature ranging between max 38.3°F (3.5°C) and min 25°F (-3.9°C). In Helena, the average high-temperature in December decreases from a cool 50.9°F (10.5°C) in November to a wintry 38.3°F (3.5°C). Weather in December »Updated: Feb 12, 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
January stands out as Helena's coldest month, with an average high-temperature of 34.2°F (1.2°C) and a low-temperature of 20.3°F (-6.5°C).
January and February are months with the least rain when the rain falls for 3.8 days and typically aggregates up to 0.94" (24mm) of rain.
In Helena, during the entire year, the rain falls for 132.3 days and collects up to 27.28" (693mm) of precipitation.
January through May, October through December are months with snowfall.
The month with the most snowfall is January, when snow falls for 7 days and typically aggregates up to 3.43" (87mm) of snow.
Throughout the year, in Helena, there are 25.5 snowfall days, and 10.91" (277mm) of snow is accumulated.
January has the least sunshine of the year in Helena, Missouri, with an average of 4.8h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Helena, Missouri.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The month with the most rainfall in Helena, Missouri, is May, when the rain falls for 17.1 days and typically aggregates up to 4.02" (102mm) of precipitation.
With an average relative humidity of 79%, June is the most humid month.
June through September are months without snowfall in Helena, Missouri.
June has the longest days of the year, with an average of 15h and 0min of daylight.
The months with the highest UV index in Helena are June through August, with an average maximum UV index of 6.
July, with average temperatures reaching a high of 85.5°F (29.7°C) and a low of 67.6°F (19.8°C), is the warmest month.
With an average of 10.3h of sunshine, July has the most sunshine of the year in Helena, Missouri.
The months with the lowest humidity are October and November, with an average relative humidity of 70%.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Helena, MO
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (34.2°F).
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure
Helena, MO
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Helena, MO
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.9mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.4mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.5mph - Average wind speed in December:
9.2mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity
Helena, MO
The month with the highest relative humidity is June (79%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall
Helena, MO
- Average rainfall in January:
0.94" - Average rainfall in February:
0.94" - Average rainfall in March:
1.89" - Average rainfall in April:
2.87" - Average rainfall in May:
4.02" - Average rainfall in June:
3.78"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January and February (0.94").
Average rainfall days
Helena, MO
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
5 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
14.1 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
15.7 days - Average rainfall days in August:
14.6 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.7 days - Average rainfall days in December:
5.5 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (3.8 days).
Average snowfall
Helena, MO
- Average snowfall in January:
3.43" - Average snowfall in February:
2.91" - Average snowfall in March:
0.94" - Average snowfall in April:
0.55" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Helena, MO
- Average snowfall days in January:
7 days - Average snowfall days in February:
7.2 days - Average snowfall days in March:
3.7 days - Average snowfall days in April:
0.7 days - Average snowfall days in May:
0.2 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
1.3 days - Average snowfall days in December:
4.9 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Helena, MO
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
5h and 30min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 24min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 6min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 18min - Average sunshine in October:
6h and 6min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days
Helena, MO
- Average sunshine days in January:
20.4 days - Average sunshine days in February:
16.9 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
13.5 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
12.2 days - Average sunshine days in August:
13.5 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
21.1 days - Average sunshine days in December:
21 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.8 days).
Average UV index
Helena, MO
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Helena, MO
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Helena, MO
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).
