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 indicates a shift in the average high-temperature, from November's cold 39.6°F (4.2°C) to a freezing cold 26.6°F (-3°C). During the month of December, the nighttime temperature in Harlem, Montana, falls to an average of 14.9°F (-9.5°C).Humidity
In December, the average relative humidity in Harlem is 80%.Rainfall
The months with the least rainfall in Harlem are February, March and December Rain falls for 7 days and accumulates 0.55" (14mm) of rain.Snowfall
Months with snowfall are January through May, September through December. In Harlem, during December, snow falls for 11.1 days and regularly aggregates up to 3.58" (91mm) of snow. Throughout the year, in Harlem, Montana, there are 57.6 snowfall days, and 21.69" (551mm) of snow is accumulated.Daylight
With an average of 8h and 24min of daylight, December has the shortest days of the year in Harlem.On the first day of December in Harlem, sunrise is at 7:46 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 4:29 pm MST.
Sunshine
The average sunshine in December in Harlem is 5.6h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Harlem. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold is December in Harlem?
What is the average humidity in December in Harlem?
What is the driest month in Harlem?
How many days does it rain in December in Harlem?
How much does it snow in Harlem in December?
What is the month with the shortest days in Harlem?
What is the average length of the day in December in Harlem?
What time are sunrise and sunset in December in Harlem?
How long on average sun shines in December in Harlem?
What is the month with the lowest UV index in Harlem?
What is the UV index intensity in December in Harlem?
Average temperature in December
Harlem, MT
- Average high temperature in December: 26.6°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is February (26.2°F).
- Average low temperature in December: 14.9°F
The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is February (12.6°F).
Average pressure in December
Harlem, MT
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in December
Harlem, MT
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity in December
Harlem, MT
- Average humidity in December: 80%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Harlem, MT
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is June (1.85").
The driest months (with the least rainfall) are February, March and December (0.55").
Average rainfall days in December
Harlem, MT
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Harlem, MT
- Average snowfall in December: 3.58"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Harlem, MT
- Average snowfall days in December: 11.1 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Harlem, MT
- Average daylight in December: 8h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in December
Harlem, MT
- Average sunshine days in December: 17 days
The month with the most sunshine days is July (21.6 days).
The month with the least sunshine days is April (12.5 days).
Average UV index in December
Harlem, MT
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Harlem, MT
- Average cloud cover in December: 42
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in December
Harlem, MT
- 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).
Harlem, Montana, USA
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