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
The shift into December brings a noticeable decrease in the average high-temperature, falling from a cold 38.7°F (3.7°C) in November to a subzero cold 23.9°F (-4.5°C). Rockville experiences a consistent average temperature of 13.5°F (-10.3°C) throughout the nights in December.Humidity
In Rockville, the average relative humidity in December is 87%.Rainfall
In Rockville, in December, it is raining for 3.4 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, in Rockville, there are 109.6 rainfall days, and 17.52" (445mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 12.6 days and typically aggregates up to 4.13" (105mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of December in Rockville, sunrise is at 7:37 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:57 am and sunset at 4:44 pm CST.
Sunshine
The average sunshine in December in Rockville is 3.4h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 1 in December translates into this advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
How cold is it in Rockville in December?
What is the average humidity in December in Rockville?
How many days does it rain in December in Rockville?
When does it snow the most in Rockville?
How many days does it snow in December in Rockville?
What is the month with the shortest days in Rockville?
What is the average length of the day in December in Rockville?
What time are sunrise and sunset in December in Rockville?
How long on average sun shines in December in Rockville?
What is the month with the lowest UV index in Rockville?
How high is the UV index in December in Rockville?
Average temperature in December
Rockville, MN
- Average high temperature in December: 23.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (18.7°F).
- Average low temperature in December: 13.5°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in December
Rockville, MN
- Average pressure in December: 30.11"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Rockville, MN
- Average wind speed in December: 8.7mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Rockville, MN
- Average humidity in December: 87%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are April and May (70%).
Average rainfall in December
Rockville, MN
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Rockville, MN
- Average rainfall days in December: 3.4 days
The month with the highest number of rainy days is June (15.3 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in December
Rockville, MN
- Average snowfall in December: 4.13"
The month with the highest snowfall is December (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rockville, MN
- Average snowfall days in December: 12.6 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rockville, MN
- Average daylight in December: 8h and 5min
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 December: 3h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Rockville, MN
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is September (19.2 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in December
Rockville, MN
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Rockville, MN
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Rockville, MN
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Rockville, Minnesota, USA
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