December weather forecastDerby, ME
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Derby, Maine, with an average temperature fluctuating between 29.5°F (-1.4°C) and 18.9°F (-7.3°C).Temperature
Onset of December comes with a temperature decline, the average high falling from a cold 41.5°F (5.3°C) in November to a subzero cold 29.5°F (-1.4°C). Derby records an average nighttime low-temperature of 18.9°F (-7.3°C) throughout December.Humidity
In December, the average relative humidity in Derby, Maine, is 83%.Rainfall
In December, the rain falls for 9.1 days. Throughout December, 2.52" (64mm) of precipitation is accumulated. In Derby, Maine, during the entire year, the rain falls for 146.2 days and collects up to 27.17" (690mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Derby, during December, snow falls for 12.1 days and regularly aggregates up to 7.48" (190mm) of snow. Throughout the year, there are 65.9 snowfall days, and 37.6" (955mm) of snow is accumulated.Daylight
December has the shortest days of the year in Derby, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 6:55 am and sunset at 3:55 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:03 pm EST.
Sunshine
In Derby, Maine, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index in Derby are January through March, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Derby, ME
- Average high temperature in December: 29.5°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 18.9°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (11.1°F).
Average pressure in December
Derby, ME
- Average pressure in December: 30"Hg
The months with the highest atmospheric pressure are September and November (30.03"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Derby, ME
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Derby, ME
- Average humidity in December: 83%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is May (75%).
Average rainfall in December
Derby, ME
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is April (2.91").
The driest month (with the least rainfall) is July (1.57").
Average rainfall days in December
Derby, ME
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in December
Derby, ME
- Average snowfall in December: 7.48"
The month with the highest snowfall is February (8.35").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Derby, ME
- Average snowfall days in December: 12.1 days
The month with the highest number of snowfall days is February (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Derby, ME
- Average daylight in December: 8h and 48min
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: 4h and 12min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in December
Derby, ME
- Average sunshine days in December: 14 days
The month with the most sunshine days is September (16.5 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in December
Derby, ME
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Derby, ME
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in December
Derby, ME
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
