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
December brings the lowest temperatures in East Helena, with an average high of 27.7°F (-2.4°C) and an average low of 14.2°F (-9.9°C).Humidity
In December, the average relative humidity is 83%.Rainfall
The months with the least rainfall are January and December Rain falls for 7.9 days and accumulates 0.63" (16mm) of rain.Snowfall
January through May, September through December are months with snowfall. In East Helena, in December, snow falls for 14.1 days, with typically accumulated 4.61" (117mm) of snow. Throughout the year, in East Helena, there are 80.4 snowfall days, and 34.88" (886mm) of snow is accumulated.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 7:52 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:50 pm MST.
Sunshine
In East Helena, the average sunshine in December is 5.8h.UV index
In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in East Helena?
How cold is December in East Helena?
What is the average humidity in December in East Helena?
What is the driest month in East Helena?
How many days does it rain in December in East Helena?
How much does it snow in East Helena in December?
What is the month with the shortest days in East Helena?
What is the average length of the day in December in East Helena?
When is the sunrise / sunset in December in East Helena?
How many hours of sunshine does East Helena have in December?
How high is the UV index in December in East Helena?
Average temperature in December
East Helena, MT
- Average high temperature in December: 27.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).
- Average low temperature in December: 14.2°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).
Average pressure in December
East Helena, MT
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
East Helena, MT
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
East Helena, MT
- Average humidity in December: 83%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall in December
East Helena, MT
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").
Average rainfall days in December
East Helena, MT
- Average rainfall days in December: 7.9 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).
Average snowfall in December
East Helena, MT
- Average snowfall in December: 4.61"
The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
East Helena, MT
- Average snowfall days in December: 14.1 days
The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
East Helena, MT
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in December
East Helena, MT
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).
Average UV index in December
East Helena, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
East Helena, MT
- Average cloud cover in December: 43
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
East Helena, MT
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
East Helena, Montana, USA
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