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 Castle Rock, the average high-temperature in December significantly decreases from an icy 41°F (5°C) in November to a freezing cold 26.1°F (-3.3°C). Throughout December, the nighttime temperature averages to 15.4°F (-9.2°C).Humidity
In Castle Rock, the average relative humidity in December is 89%.Rainfall
In Castle Rock, during December, the rain falls for 4.3 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Castle Rock, during the entire year, the rain falls for 126.4 days and collects up to 24.76" (629mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Castle Rock, Minnesota. In Castle Rock, in December, during 11.6 snowfall days, 4.21" (107mm) of snow is typically accumulated. In Castle Rock, during the entire year, snow falls for 55.6 days and aggregates up to 22.36" (568mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of December in Castle Rock, sunrise is at 7:29 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:42 pm CST.
Sunshine
The average sunshine in December is 3.5h.UV index
The months with the lowest UV index in Castle Rock are January, February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A daily high UV index of 1 in December leads to these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
How cold is December in Castle Rock?
What is the average humidity in December in Castle Rock?
How much does it rain in Castle Rock in December?
How much does it snow in Castle Rock in December?
What is the month with the shortest days in Castle Rock?
What is the average length of the day in December in Castle Rock?
When are sunrise and sunset in December in Castle Rock?
How many hours of sunshine does Castle Rock have in December?
When is the lowest UV index in Castle Rock?
What is the UV index intensity in December in Castle Rock?
Average temperature in December
Castle Rock, MN
- Average high temperature in December: 26.1°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (20.8°F).
- Average low temperature in December: 15.4°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (7.7°F).
Average pressure in December
Castle Rock, 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 (29.88"Hg).
Average wind speed in December
Castle Rock, MN
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in December
Castle Rock, MN
- Average humidity in December: 89%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are April and October (73%).
Average rainfall in December
Castle Rock, MN
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is June (4.21").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in December
Castle Rock, MN
- Average rainfall days in December: 4.3 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in December
Castle Rock, MN
- Average snowfall in December: 4.21"
The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Castle Rock, MN
- Average snowfall days in December: 11.6 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Castle Rock, MN
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 3min
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 0min).
Average sunshine days in December
Castle Rock, MN
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in December
Castle Rock, 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
Castle Rock, MN
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Castle Rock, MN
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Castle Rock, Minnesota, USA
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