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
December brings a drop in Defiance's average high-temperature, falling from a chilly 45.9°F (7.7°C) in November to a subzero cold 31.8°F (-0.1°C). Defiance's nighttime temperature in December drops to an average of 20.3°F (-6.5°C).Humidity
In Defiance, the average relative humidity in December is 80%.Rainfall
In Defiance, during December, the rain falls for 4.5 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Defiance, during the entire year, the rain falls for 123 days and collects up to 24.72" (628mm) of precipitation.Snowfall
Months with snowfall in Defiance, Iowa, are January through May, October through December. In December, it is snowing for 8 days. Throughout December, 2.44" (62mm) of snow is accumulated. In Defiance, during the entire year, snow falls for 36.8 days and aggregates up to 14.53" (369mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Defiance.On the first day of the month, sunrise is at 7:29 am and sunset at 4:51 pm. On the last day of December, in Defiance, sunrise is at 7:48 am and sunset at 5:00 pm CST.
Sunshine
The average sunshine in December in Defiance is 4.7h.UV index
In Defiance, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. To protect against the Sun's most potent rays, avoid direct exposure around midday. 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 December in Defiance?
What is the average humidity in December in Defiance?
How many days does it rain in December in Defiance?
How much does it snow in Defiance in December?
What is the month with the shortest days in Defiance?
How many hours of daylight does Defiance have in December?
When are sunrise and sunset in December in Defiance?
How many hours of sunshine does Defiance have in December?
How high is the UV index in December in Defiance?
Average temperature in December
Defiance, IA
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 20.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14°F).
Average pressure in December
Defiance, 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
Defiance, IA
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in December
Defiance, IA
- Average humidity in December: 80%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in December
Defiance, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in December
Defiance, IA
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Defiance, IA
- Average snowfall in December: 2.44"
The month with the highest snowfall is February (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Defiance, IA
- Average snowfall days in December: 8 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Defiance, 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 12min).
- Average sunshine in December: 4h and 4min
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 12min).
Average sunshine days in December
Defiance, IA
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in December
Defiance, 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
Defiance, IA
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Defiance, 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).
Defiance, Iowa, USA
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