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
With December's onset, the average high-temperature recedes from November's chilly 44.1°F (6.7°C) to a subzero cold 31.1°F (-0.5°C). Throughout December, Dewar anticipates an average low-temperature of 20.5°F (-6.4°C).Humidity
In December, the average relative humidity in Dewar, Iowa, is 82%.Rainfall
In Dewar, in December, it is raining for 5.8 days, with typically 1.34" (34mm) of accumulated precipitation. In Dewar, during the entire year, the rain falls for 133.6 days and collects up to 28.27" (718mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Dewar, Iowa. In Dewar, during December, snow falls for 8.9 days and regularly aggregates up to 2.8" (71mm) of snow. Throughout the year, there are 41.6 snowfall days, and 15.24" (387mm) of snow is accumulated.Daylight
December has the shortest days of the year in Dewar, Iowa, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:19 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine in Dewar is 4.3h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 1 in December leads to these recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is December in Dewar?
What is the average humidity in December in Dewar?
How much does it rain in Dewar in December?
How many days does it snow in December in Dewar?
What is the month with the shortest days in Dewar?
How many hours of daylight does Dewar have in December?
When is the sunrise / sunset in December in Dewar?
How long on average sun shines in December in Dewar?
What is the month with the lowest UV index in Dewar?
What is the UV index intensity in December in Dewar?
Average temperature in December
Dewar, IA
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 20.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in December
Dewar, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Dewar, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in December
Dewar, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Dewar, IA
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in December
Dewar, IA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Dewar, IA
- Average snowfall in December: 2.8"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Dewar, IA
- Average snowfall days in December: 8.9 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Dewar, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Dewar, IA
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Dewar, IA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Dewar, IA
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Dewar, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Dewar, Iowa, USA
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