Climate and monthly weather forecastDecker, MT
Climate and monthly weather forecast
Weather in January
January, the same as December, in Decker, Montana, is another subzero cold winter month, with an average temperature ranging between min 16.2°F (-8.8°C) and max 31.8°F (-0.1°C). With January's arrival, Decker notes an average high-temperature of a still freezing cold 31.8°F (-0.1°C), closely following the trend of the preceding month. Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Decker, Montana, with an average temperature varying between 16.2°F (-8.8°C) and 31.6°F (-0.2°C). Decker experiences an average high-temperature of a still subzero cold 31.6°F (-0.2°C) with the onset of February, subtly varied from January's 31.8°F (-0.1°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Decker, Montana, with an average temperature varying between 45°F (7.2°C) and 28.2°F (-2.1°C). March signals a shift in the average high-temperature, moving from February's subzero cold 31.6°F (-0.2°C) to a chilly 45°F (7.2°C). Weather in March »Weather in April
April is a cool spring month in Decker, Montana, with an average temperature fluctuating between 53.1°F (11.7°C) and 34.2°F (1.2°C). April marks a minor ascent in the average high-temperature, adjusting from March's chilly 45°F (7.2°C) to a cool 53.1°F (11.7°C). Weather in April »Weather in May
May, the last month of the spring in Decker, is an enjoyable month, with an average temperature ranging between min 43.5°F (6.4°C) and max 63.7°F (17.6°C). The arrival of May brings a change in Decker's weather, with average high-temperatures moving from April's fresh 53.1°F (11.7°C) to a refreshing 63.7°F (17.6°C). Weather in May »Weather in June
June, the first month of the summer in Decker, is a warm month, with temperature in the range of an average low of 52.9°F (11.6°C) and an average high of 75.7°F (24.3°C). Decker's weather shows a temperature rise with the arrival of June, moving from an enjoyable 63.7°F (17.6°C) in May to a warm 75.7°F (24.3°C). Weather in June »Weather in July
July, like June, in Decker, Montana, is a moderately hot summer month, with an average temperature ranging between min 61.5°F (16.4°C) and max 85.5°F (29.7°C). July is the warmest month of the year, registering average temperatures as high as 85.5°F (29.7°C) and as low as 61.5°F (16.4°C). July's mean heat index is computed to be a hot 86°F (30°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Decker, Montana, with temperature in the range of an average low of 60.4°F (15.8°C) and an average high of 83.7°F (28.7°C). In Decker, August's average high-temperature stands at a still warm 83.7°F (28.7°C), closely related to the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Decker, Montana, with an average temperature ranging between max 74.1°F (23.4°C) and min 52.7°F (11.5°C). During the transition into September, Decker observes a decrease in the average high-temperature, falling from a warm 83.7°F (28.7°C) in August to a still moderately hot 74.1°F (23.4°C). Weather in September »Weather in October
October, the same as September, in Decker, Montana, is another refreshing autumn month, with an average temperature fluctuating between 56.8°F (13.8°C) and 39°F (3.9°C). A shift in Decker's weather is noticeable as September turns into October, with the average high temperature decreasing from a moderately hot 74.1°F (23.4°C) to a moderate 56.8°F (13.8°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Decker, Montana, with an average temperature ranging between min 27.1°F (-2.7°C) and max 43.3°F (6.3°C). November brings a minor decrease, with the average high-temperature reducing from a refreshing 56.8°F (13.8°C) in October to a frosty 43.3°F (6.3°C). Weather in November »Weather in December
December, the first month of the winter in Decker, is also a subzero cold month, with an average temperature ranging between max 31.1°F (-0.5°C) and min 16.7°F (-8.5°C). In Decker, the month of December is known for its lowest average temperatures, reaching a high of 31.1°F (-0.5°C) and a low of 16.7°F (-8.5°C). Weather in December »Updated: Jul 16, 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
The months with the highest humidity are January and February, with an average relative humidity of 79%.
Throughout the year, there are 127.6 rainfall days, and 14.25" (362mm) of precipitation is accumulated.
Months with snowfall are January through May, September through December.
Throughout the year, there are 65.3 snowfall days, and 28.82" (732mm) of snow is accumulated.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 14.3 days and typically aggregates up to 5.2" (132mm) of snow.
February has the least sunshine of the year, with an average of 5.7h 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.
May is the month with the most rainfall. Rain falls for 18 days and accumulates 2.64" (67mm) of precipitation.
June through August are months without snowfall.
June has the longest days of the year in Decker, with an average of 15h and 36min of daylight.
The warmest period tends to be July, when average temperatures fluctuate between a high of 85.5°F (29.7°C) and a low of 61.5°F (16.4°C).
The months with the most sunshine are July and August, with an average of 11.9h of sunshine.
With an average maximum UV index of 7, July is the month with the highest UV index.
The least humid month is August, with an average relative humidity of 40%.
Decker's coldest month, December, registers temperatures that range from a high of 31.1°F (-0.5°C) to a low of 16.7°F (-8.5°C).
December is the month with the least rainfall. Rain falls for 6.8 days and accumulates 0.67" (17mm) of precipitation.
With an average of 8h and 48min of daylight, December has the shortest days of the year.
Average temperature
Decker, MT
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (31.1°F).
The month with the highest average low temperature is July (61.5°F).
The coldest months (with the lowest average low temperature) are January and February (16.2°F).
Average pressure
Decker, MT
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.85"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.93"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
Decker, MT
- Average wind speed in January:
7.4mph - Average wind speed in February:
7mph - Average wind speed in March:
7.6mph - Average wind speed in April:
9.1mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
7mph - Average wind speed in September:
7.6mph - Average wind speed in October:
8.3mph - Average wind speed in November:
7mph - Average wind speed in December:
6.8mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and December (6.8mph).
Average humidity
Decker, MT
The months with the highest relative humidity are January and February (79%).
The month with the lowest relative humidity is August (40%).
Average rainfall
Decker, MT
- Average rainfall in January:
0.75" - Average rainfall in February:
0.83" - Average rainfall in March:
1.14" - Average rainfall in April:
2.01" - Average rainfall in May:
2.64" - Average rainfall in June:
1.46"
- Average rainfall in July:
1.14" - Average rainfall in August:
1.1" - Average rainfall in September:
0.83" - Average rainfall in October:
0.94" - Average rainfall in November:
0.75" - Average rainfall in December:
0.67"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is December (0.67").
Average rainfall days
Decker, MT
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
7.7 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
18 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
10.7 days - Average rainfall days in August:
11.6 days - Average rainfall days in September:
8.6 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
7.2 days - Average rainfall days in December:
6.8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (6.3 days).
Average snowfall
Decker, MT
- Average snowfall in January:
4.45" - Average snowfall in February:
5.2" - Average snowfall in March:
4.29" - Average snowfall in April:
5.08" - Average snowfall in May:
0.87" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Decker, MT
- Average snowfall days in January:
12 days - Average snowfall days in February:
14.3 days - Average snowfall days in March:
9.5 days - Average snowfall days in April:
6.3 days - Average snowfall days in May:
1.3 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:
0.2 days - Average snowfall days in October:
2.8 days - Average snowfall days in November:
7.7 days - Average snowfall days in December:
11.2 days
The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Decker, MT
- Average daylight in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 54min - Average daylight in June:
15h and 36min
- Average daylight in July:
15h and 12min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 36min - Average daylight in December:
8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
6h and 6min - Average sunshine in February:
5h and 42min - Average sunshine in March:
8h and 6min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 30min - Average sunshine in June:
11h and 36min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 54min - Average sunshine in September:
10h and 48min - Average sunshine in October:
6h and 48min - Average sunshine in November:
6h and 36min - Average sunshine in December:
6h and 6min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days
Decker, MT
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
11.5 days - Average sunshine days in March:
12 days - Average sunshine days in April:
10.3 days - Average sunshine days in May:
9.6 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
13.6 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
17.1 days - Average sunshine days in November:
16.9 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is September (18.2 days).
The month with the least sunshine days is May (9.6 days).
Average UV index
Decker, MT
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Decker, MT
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility
Decker, 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).
