Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In Geyser, the lowest average temperatures are observed in December, with a high of 24.3°F (-4.3°C) and a low of 11.7°F (-11.3°C).Humidity
The average relative humidity in December is 85%.Rainfall
The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 1.26" (32mm) of precipitation.Snowfall
January through June, August through December are months with snowfall. In Geyser, during December, snow falls for 17.9 days and regularly aggregates up to 10" (254mm) of snow. In Geyser, during the entire year, snow falls for 137.4 days and aggregates up to 110.08" (2796mm) of snow.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:48 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 8:08 am and sunset at 4:42 pm MST.
Sunshine
In December, the average sunshine is 5h.UV index
In Geyser, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: The UV index of 2 during December translates into the following guidance:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Enhance your sun protection with tightly woven, yet airy clothing. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Geyser have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Geyser, MT
- Average high temperature in December: 24.3°F
The warmest month (with the highest average high temperature) is July (73.9°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in December: 11.7°F
The months with the highest average low temperature are July and August (48.2°F).
The coldest month (with the lowest average low temperature) is December (11.7°F).
Average pressure in December
Geyser, MT
- 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 in December
Geyser, MT
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Geyser, MT
- Average humidity in December: 85%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (53%).
Average rainfall in December
Geyser, MT
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is May (4.69").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in December
Geyser, MT
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is June (20.9 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in December
Geyser, MT
- Average snowfall in December: 10"
The month with the highest snowfall is April (19.29").
The month with the least snowfall is July (0").
Average snowfall days in December
Geyser, MT
- Average snowfall days in December: 17.9 days
The month with the highest number of snowfall days is March (20.3 days).
The month with the least snowfall days is July (0 days).
Average daylight in December /
Average sunshine in December
Geyser, MT
- Average daylight in December: 8h and 4min
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 36min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Geyser, MT
- Average sunshine days in December: 12.1 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is May (4.7 days).
Average UV index in December
Geyser, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in December
Geyser, MT
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
Geyser, MT
- Average visibility in December: 5mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is February (4mi).
Geyser, Montana, USA
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