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
Rockland's temperature records reveal December as the coldest month, marked by average highs of 29.3°F (-1.5°C) and lows of 18°F (-7.8°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In December, the rain falls for 8.5 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. In Rockland, during the entire year, the rain falls for 108.7 days and collects up to 10.47" (266mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Rockland, Idaho, during December, snow falls for 13.7 days and regularly aggregates up to 5.28" (134mm) of snow. Throughout the year, there are 57.1 snowfall days, and 25.2" (640mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:42 am and sunset at 4:59 pm. On the last day of December, sunrise is at 8:01 am and sunset at 5:08 pm MST.
Sunshine
In December, the average sunshine is 5.2h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading 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 maximum UV index of 1 translates into these guidelines:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
How cold is December?
What is the average humidity in December in Rockland?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rockland have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Rockland, ID
- Average high temperature in December: 29.3°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is August (58.5°F).
The coldest months (with the lowest average low temperature) are January and December (18°F).
Average pressure in December
Rockland, ID
- Average pressure in December: 30.26"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Rockland, ID
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest months (with the lowest average wind speed) are January and December (7mph).
Average humidity in December
Rockland, ID
- Average humidity in December: 84%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (32%).
Average rainfall in December
Rockland, ID
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is March (1.18").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in December
Rockland, ID
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in December
Rockland, ID
- Average snowfall in December: 5.28"
The month with the highest snowfall is January (7.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Rockland, ID
- Average snowfall days in December: 13.7 days
The month with the highest number of snowfall days is December (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Rockland, ID
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 5h and 1min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Rockland, ID
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is February (12.4 days).
Average UV index in December
Rockland, ID
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rockland, ID
- Average cloud cover in December: 47
The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Rockland, ID
- 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).
Rockland, Idaho, USA
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