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
The onset of December results in a decrease in the average high-temperature, receding from a frosty 47.3°F (8.5°C) in November to an icy 34.7°F (1.5°C). Runnells reports an average nighttime low-temperature of 22.8°F (-5.1°C) in December.Humidity
In December, the average relative humidity is 78%.Rainfall
In Runnells, in December, during 5.4 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Runnells, during the entire year, the rain falls for 124.7 days and collects up to 26.34" (669mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Runnells, during December, snow falls for 7 days and regularly aggregates up to 1.42" (36mm) of snow. Throughout the year, there are 35.2 snowfall days, and 13.31" (338mm) 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 7:21 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:53 pm CST.
Sunshine
The average sunshine in December is 4.6h.UV index
In Runnells, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Runnells?
What is the average humidity in December?
How many days 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 Runnells have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Runnells, IA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in December: 22.8°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in December
Runnells, 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 (29.89"Hg).
Average wind speed in December
Runnells, IA
- Average wind speed in December: 9.8mph
The windiest months (with the highest average wind speed) are March and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in December
Runnells, IA
- Average humidity in December: 78%
The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Runnells, IA
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is May (4.45").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in December
Runnells, IA
- Average rainfall days in December: 5.4 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Runnells, IA
- Average snowfall in December: 1.42"
The month with the highest snowfall is January (4.37").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Runnells, IA
- Average snowfall days in December: 7 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Runnells, IA
- Average daylight in December: 9h and 1min
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 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Runnells, IA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Runnells, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Runnells, 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, August and September (Cloud cover 31).
Average visibility in December
Runnells, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Runnells, Iowa, USA
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