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
A subtle decrease in the average high-temperature marks December, falling from November's frosty 43.7°F (6.5°C) to a subzero cold 31.1°F (-0.5°C). Delaware anticipates an average minimum temperature of 20.5°F (-6.4°C) in the month of December.Humidity
The average relative humidity in December in Delaware is 83%.Rainfall
December is the month with the least rainfall. Rain falls for 4.5 days and accumulates 0.47" (12mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Delaware, in December, snow falls for 8.8 days, with typically accumulated 0.94" (24mm) of snow. Throughout the year, there are 39.4 snowfall days, and 6.81" (173mm) of snow is accumulated.Daylight
The month with the shortest days in Delaware is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:15 am and sunset at 4:33 pm. On the last day of December, in Delaware, sunrise is at 7:34 am and sunset at 4:42 pm CST.
Sunshine
The average sunshine in December is 4h.UV index
The months with the lowest UV index are January, November and December, 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 the average person.Note: The maximum UV index of 1 during December translates into these guidelines:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much 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 Delaware have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Delaware, IA
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (79.3°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°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in December
Delaware, IA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Delaware, IA
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Delaware, IA
- Average humidity in December: 83%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in December
Delaware, IA
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in December
Delaware, IA
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is June (15.4 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in December
Delaware, IA
- Average snowfall in December: 0.94"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Delaware, IA
- Average snowfall days in December: 8.8 days
The month with the highest number of snowfall days is January (10.8 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
Delaware, IA
- Average daylight in December: 9h and 1min
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 0min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Delaware, IA
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Delaware, IA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Delaware, IA
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in December
Delaware, 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).
Delaware, Iowa, USA
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