December weather forecastHelena, MO
December
Weather in December
The first month of the winter, December, is also an icy month in Helena, Missouri, with an average temperature ranging between max 38.3°F (3.5°C) and min 25°F (-3.9°C).Temperature
In Helena, the average high-temperature in December decreases from a cool 50.9°F (10.5°C) in November to a wintry 38.3°F (3.5°C). Helena, during the month of December, experiences an average low-temperature of 25°F (-3.9°C).Humidity
In Helena, Missouri, the average relative humidity in December is 76%.Rainfall
In Helena, Missouri, during December, the rain falls for 5.5 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Helena, during the entire year, the rain falls for 132.3 days and collects up to 27.28" (693mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Helena, during December, snow falls for 4.9 days and regularly aggregates up to 1.73" (44mm) of snow. Throughout the year, in Helena, there are 25.5 snowfall days, and 10.91" (277mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December in Helena, Missouri, sunrise is at 7:21 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 5:03 pm CST.
Sunshine
In December, the average sunshine is 5.3h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Helena, MO
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Helena, MO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Helena, MO
- Average wind speed in December: 9.2mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in December
Helena, MO
- Average humidity in December: 76%
The month with the highest relative humidity is June (79%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in December
Helena, MO
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January and February (0.94").
Average rainfall days in December
Helena, MO
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in December
Helena, MO
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Helena, MO
- Average snowfall days in December: 4.9 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Helena, MO
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Helena, MO
- Average sunshine days in December: 21 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in December
Helena, MO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Helena, MO
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Helena, MO
- Average visibility in December: 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).
