Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
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. Throughout January nights, Decker experiences a consistent temperature average of 16.2°F (-8.8°C).Humidity
January and February, with an average relative humidity of 79%, are the most humid months.Rainfall
In Decker, Montana, in January, during 6.3 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 127.6 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In Decker, during January, snow falls for 12 days and regularly aggregates up to 4.45" (113mm) of snow. In Decker, during the entire year, snow falls for 65.3 days and aggregates up to 28.82" (732mm) of snow.Daylight
In January, the average length of the day is 9h and 14min.On the first day of January in Decker, sunrise is at 7:45 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:13 pm MST.
Sunshine
The average sunshine in January is 6.1h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 2 during January translates into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January?
What are the most humid months in Decker?
What is the average humidity in January?
How many days does it rain in January?
How many days does it snow in January?
How many hours of daylight does Decker have in January?
What time are sunrise and sunset in January?
How long on average sun shines in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Decker, MT
- Average high temperature in January: 31.8°F
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).
- Average low temperature in January: 16.2°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 in January
Decker, MT
- Average pressure in January: 30.13"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 in January
Decker, MT
- Average wind speed in January: 7.4mph
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 in January
Decker, MT
- Average humidity in January: 79%
The months with the highest relative humidity are January and February (79%).
The month with the lowest relative humidity is August (40%).
Average rainfall in January
Decker, MT
- Average rainfall in January: 0.75"
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 in January
Decker, MT
- Average rainfall days in January: 6.3 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 in January
Decker, MT
- Average snowfall in January: 4.45"
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 in January
Decker, MT
- Average snowfall days in January: 12 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 in January /
Average sunshine in January
Decker, MT
- Average daylight in January: 9h and 1min
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 1min
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 in January
Decker, MT
- Average sunshine days in January: 15.3 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 in January
Decker, MT
- Average UV index in January: 2
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 in January
Decker, MT
- Average cloud cover in January: 36
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 in January
Decker, MT
- Average visibility in January: 6mi
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).
Decker, Montana, USA
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