December weather forecastJolley, IA
December
Weather in December
December, the first month of the winter in Jolley, is also a subzero cold month, with an average temperature fluctuating between 19.6°F (-6.9°C) and 30.7°F (-0.7°C).Temperature
The transition into December involves a decrease in the average high-temperature, falling from a chilly 45°F (7.2°C) in November to a freezing cold 30.7°F (-0.7°C). Jolley's December nights cool down to an average low-temperature of 19.6°F (-6.9°C).Humidity
In Jolley, the average relative humidity in December is 81%.Rainfall
In Jolley, Iowa, in December, it is raining for 4.5 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Jolley, Iowa, there are 128 rainfall days, and 26.18" (665mm) of precipitation is accumulated.Snowfall
Months with snowfall in Jolley, Iowa, are January through May, October through December. In Jolley, during December, snow falls for 8.5 days and regularly aggregates up to 2.52" (64mm) of snow. In Jolley, during the entire year, snow falls for 39.2 days and aggregates up to 17.64" (448mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:29 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:48 am and sunset at 4:56 pm CST.
Sunshine
In Jolley, the average sunshine in December is 4.7h.UV index
In Jolley, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Jolley, IA
- Average high temperature in December: 30.7°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 (25.2°F).
- Average low temperature in December: 19.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in December
Jolley, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Jolley, IA
- Average wind speed in December: 10.4mph
The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
Jolley, IA
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in December
Jolley, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in December
Jolley, IA
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Jolley, IA
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (5.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Jolley, IA
- Average snowfall days in December: 8.5 days
The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jolley, IA
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Jolley, IA
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (9.9 days).
Average UV index in December
Jolley, 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 February (UV index 1).
Average cloud cover in December
Jolley, IA
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in December
Jolley, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
