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 arrival of December signals a shift in temperature, down from a frosty 48.6°F (9.2°C) in November to an icy 34.7°F (1.5°C). During December, Henderson's temperature averages to a freezing cold 22.1°F (-5.5°C) at night.Humidity
In Henderson, the average relative humidity in December is 78%.Rainfall
In December, in Henderson, the rain falls for 4.2 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. Throughout the year, in Henderson, Iowa, there are 117.2 rainfall days, and 21.77" (553mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 4.8 days. Throughout December, 1.65" (42mm) of snow is accumulated. In Henderson, during the entire year, snow falls for 26.7 days and aggregates up to 9.76" (248mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:28 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:03 pm CST.
Sunshine
The average sunshine in December is 4.9h.UV index
The months with the lowest UV index in Henderson, Iowa, are January, February, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
How cold is it in Henderson in December?
What is the average humidity in December in Henderson?
How much does it rain in Henderson in December?
How many days does it snow in December in Henderson?
What is the month with the shortest days in Henderson?
How many hours of daylight does Henderson have in December?
What time are sunrise and sunset in December in Henderson?
How long on average sun shines in December in Henderson?
What is the month with the lowest UV index in Henderson?
How high is the UV index in December in Henderson?
Average temperature in December
Henderson, IA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in December
Henderson, IA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Henderson, IA
- Average wind speed in December: 9.6mph
The windiest months (with the highest average wind speed) are March and April (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in December
Henderson, IA
- Average humidity in December: 78%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Henderson, IA
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is June (4.06").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in December
Henderson, IA
- Average rainfall days in December: 4.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in December
Henderson, IA
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (2.68").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Henderson, IA
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Henderson, IA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 5min
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 36min).
Average sunshine days in December
Henderson, IA
- Average sunshine days in December: 23.1 days
The month with the most sunshine days is December (23.1 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in December
Henderson, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Henderson, IA
- Average cloud cover in December: 46
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Henderson, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Henderson, Iowa, USA
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