December weather forecastGuernsey, IA
December
Weather in December
December, the first month of the winter in Guernsey, is also a wintry month, with an average temperature varying between 33.6°F (0.9°C) and 22.3°F (-5.4°C).Temperature
The commencement of December indicates a shift in the average high-temperature, receding from November's frosty 46.8°F (8.2°C) to a wintry 33.6°F (0.9°C). In Guernsey, the expected average low-temperature for December is a subzero cold 22.3°F (-5.4°C).Humidity
The average relative humidity in December is 80%.Rainfall
In Guernsey, during December, the rain falls for 7.3 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, there are 145.5 rainfall days, and 30.39" (772mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Guernsey, Iowa, in December, during 7.5 snowfall days, 2.24" (57mm) of snow is typically accumulated. Throughout the year, in Guernsey, there are 39 snowfall days, and 16.65" (423mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:49 pm CST.
Sunshine
In Guernsey, the average sunshine in December is 4.6h.UV index
In Guernsey, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Guernsey, IA
- Average high temperature in December: 33.6°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 (27.1°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in December
Guernsey, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Guernsey, IA
- Average wind speed in December: 10.1mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Guernsey, IA
- Average humidity in December: 80%
The months with the highest relative humidity are January and July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Guernsey, IA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in December
Guernsey, IA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
Guernsey, IA
- Average snowfall in December: 2.24"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Guernsey, IA
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Guernsey, IA
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Guernsey, IA
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.3 days).
Average UV index in December
Guernsey, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Guernsey, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Guernsey, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
