Climate and monthly weather forecastSun River, MT
Climate and monthly weather forecast
Weather in January
January, the same as December, in Sun River, Montana, is another subzero cold winter month, with temperature in the range of an average high of 31.3°F (-0.4°C) and an average low of 18.7°F (-7.4°C). Sun River, Montana, registers an average high-temperature of a still subzero cold 31.3°F (-0.4°C) with the arrival of January, showing minor deviation from the preceding month. Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Sun River, Montana, with an average temperature varying between 17.6°F (-8°C) and 31.3°F (-0.4°C). February's entry sees an average high-temperature of a still subzero cold 31.3°F (-0.4°C), replicating January's climate. Weather in February »Weather in March
The first month of the spring, March, is an icy month in Sun River, Montana, with an average temperature ranging between max 42.6°F (5.9°C) and min 27°F (-2.8°C). The shift into March is characterized by a rise in the average high-temperature, transitioning from February's freezing cold 31.3°F (-0.4°C) to an icy 42.6°F (5.9°C). Weather in March »Weather in April
April is a fresh spring month in Sun River, Montana, with temperature in the range of an average low of 34.3°F (1.3°C) and an average high of 51.4°F (10.8°C). In Sun River, the onset of April comes with a modest high-temperature shift, transitioning from March's cold 42.6°F (5.9°C) to a cool 51.4°F (10.8°C). Weather in April »Weather in May
May, the last month of the spring in Sun River, is a comfortable month, with an average temperature fluctuating between 41.9°F (5.5°C) and 62.2°F (16.8°C). The arrival of May brings a change in Sun River's weather, with average high-temperatures moving from April's cool 51.4°F (10.8°C) to an enjoyable 62.2°F (16.8°C). Weather in May »Weather in June
The first month of the summer, June, is a pleasant month in Sun River, Montana, with an average temperature ranging between max 71.2°F (21.8°C) and min 48.7°F (9.3°C). The shift from May to June is marked by an increase in the average high-temperature, moving from an enjoyable 62.2°F (16.8°C) to an agreeable 71.2°F (21.8°C). Weather in June »Weather in July
July is a moderately hot summer month in Sun River, Montana, with an average temperature fluctuating between 82.2°F (27.9°C) and 55.6°F (13.1°C). With average high and low temperatures of 82.2°F (27.9°C) and 55.6°F (13.1°C) respectively, July is Sun River's warmest month. During July, the heat index is estimated at 82.4°F (28°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Sun River, Montana, with an average temperature fluctuating between 81.1°F (27.3°C) and 56.7°F (13.7°C). The average high-temperature for August is a still warm 81.1°F (27.3°C), closely aligning with the temperature of the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Sun River, is also an agreeable month, with an average temperature varying between 49.5°F (9.7°C) and 70.5°F (21.4°C). The shift from August to September involves a decrease in the average high-temperature, dropping from a warm 81.1°F (27.3°C) to an agreeable 70.5°F (21.4°C). Weather in September »Weather in October
October, like September, in Sun River, Montana, is a cool autumn month, with an average temperature varying between 54.5°F (12.5°C) and 36.7°F (2.6°C). October signals a significant shift in the average high-temperature, falling from September's agreeable 70.5°F (21.4°C) to a cool 54.5°F (12.5°C). Weather in October »Weather in November
The last month of the autumn, November, is also an icy month in Sun River, Montana, with an average temperature varying between 26.6°F (-3°C) and 40.1°F (4.5°C). With the onset of November, Sun River experiences a distinct temperature drop, with the average high-temperature reducing from October's fresh 54.5°F (12.5°C) to a cold 40.1°F (4.5°C). Weather in November »Weather in December
December, the first month of the winter in Sun River, is also a subzero cold month, with an average temperature varying between 29.5°F (-1.4°C) and 17.4°F (-8.1°C). Sun River records the coldest temperatures in December, averaging a high of 29.5°F (-1.4°C) and a low of 17.4°F (-8.1°C). Weather in December »Updated: Feb 13, 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
With an average relative humidity of 78%, January is the most humid month.
January and July are months with the least rain in Sun River when the rain falls for 4.8 days and typically aggregates up to 0.63" (16mm) of rain.
Throughout the year, in Sun River, there are 112.8 rainfall days, and 12.95" (329mm) of precipitation is accumulated.
Months with snowfall are January through May, September through December.
Throughout the year, there are 69.4 snowfall days, and 35.35" (898mm) of snow is accumulated.
The months with the least sunshine are January and December, with an average of 5.4h of sunshine.
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
The month with the most snowfall in Sun River is February, when snow falls for 14.4 days and typically aggregates up to 6.34" (161mm) of snow.
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.
June is the month with the most rainfall in Sun River. Rain falls for 13.8 days and accumulates 2.05" (52mm) of precipitation.
June through August are months without snowfall in Sun River.
June has the longest days of the year, with an average of 15h and 54min of daylight.
Sun River's warmest temperatures are experienced in July, with average high temperatures of 82.2°F (27.9°C) and lows of 55.6°F (13.1°C).
July has the most sunshine of the year in Sun River, Montana, with an average of 11.9h of sunshine.
The month with the highest UV index is July, with an average maximum UV index of 6.
August is the least humid month, with an average relative humidity of 41%.
December is the coldest month, with the temperature often reaching an average high of 29.5°F (-1.4°C) and an average low of 17.4°F (-8.1°C).
The month with the shortest days in Sun River is December, with an average of 8h and 30min of daylight.
Average temperature
Sun River, MT
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (29.5°F).
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is December (17.4°F).
Average pressure
Sun River, MT
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.14"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Sun River, MT
- Average wind speed in January:
10.7mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.5mph - Average wind speed in May:
8.1mph - Average wind speed in June:
8.2mph
- Average wind speed in July:
7.5mph - Average wind speed in August:
7.3mph - Average wind speed in September:
8.2mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.7mph - Average wind speed in December:
10.4mph
The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity
Sun River, MT
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall
Sun River, MT
- Average rainfall in January:
0.63" - Average rainfall in February:
0.91" - Average rainfall in March:
0.91" - Average rainfall in April:
1.61" - Average rainfall in May:
1.69" - Average rainfall in June:
2.05"
- Average rainfall in July:
0.63" - Average rainfall in August:
0.79" - Average rainfall in September:
1.14" - Average rainfall in October:
0.98" - Average rainfall in November:
0.94" - Average rainfall in December:
0.67"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are January and July (0.63").
Average rainfall days
Sun River, MT
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
6 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
14.1 days - Average rainfall days in May:
15.2 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
9 days - Average rainfall days in August:
8.8 days - Average rainfall days in September:
8.7 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
4.9 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall
Sun River, MT
- Average snowfall in January:
4.41" - Average snowfall in February:
6.34" - Average snowfall in March:
4.92" - Average snowfall in April:
4.41" - Average snowfall in May:
0.63" - Average snowfall in June:
0"
The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Sun River, MT
- Average snowfall days in January:
11.5 days - Average snowfall days in February:
14.4 days - Average snowfall days in March:
9.9 days - Average snowfall days in April:
6 days - Average snowfall days in May:
1.2 days - Average snowfall days in June:
0.1 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 days - Average snowfall days in November:
9.2 days - Average snowfall days in December:
12.4 days
The month with the highest number of snowfall days is February (14.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Sun River, 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 42min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 54min
- 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 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
5h and 30min - Average sunshine in March:
7h and 30min - Average sunshine in April:
8h and 54min - Average sunshine in May:
10h and 6min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 24min - Average sunshine in September:
9h and 36min - Average sunshine in October:
6h and 30min - Average sunshine in November:
6h and 0min - Average sunshine in December:
5h and 24min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days
Sun River, MT
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
11.2 days - Average sunshine days in March:
13 days - Average sunshine days in April:
10.3 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
17.7 days - Average sunshine days in August:
18.2 days - Average sunshine days in September:
18.8 days - Average sunshine days in October:
16.4 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (10.3 days).
Average UV index
Sun River, MT
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Sun River, MT
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility
Sun River, 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).
