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 comes with a decrease in the average high-temperature, falling from a frosty 48°F (8.9°C) in November to an icy 36°F (2.2°C). Westwood's nights in December experience an average temperature drop to a subzero cold 24.6°F (-4.1°C).Humidity
In Westwood, the average relative humidity in December is 80%.Rainfall
The months with the least rainfall in Westwood are February and December Rain falls for 7.3 days and accumulates 1.38" (35mm) of rain.Snowfall
January through April, October through December are months with snowfall. In Westwood, in December, snow falls for 6 days, with typically accumulated 1.65" (42mm) of snow. In Westwood, during the entire year, snow falls for 30.7 days and aggregates up to 15" (381mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:12 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:48 pm CST.
Sunshine
The average sunshine in December is 4.5h.UV index
In Westwood, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Westwood?
What is the average humidity in December in Westwood?
What is the driest month in Westwood?
How much does it rain in Westwood in December?
How many days does it snow in December in Westwood?
What is the month with the shortest days in Westwood?
What is the average length of the day in December in Westwood?
What time are sunrise and sunset in December in Westwood?
How long on average sun shines in December in Westwood?
What is the UV index intensity in December in Westwood?
Average temperature in December
Westwood, IA
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Westwood, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Westwood, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in December
Westwood, IA
- Average humidity in December: 80%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Westwood, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").
Average rainfall days in December
Westwood, IA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Westwood, IA
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Westwood, IA
- Average snowfall days in December: 6 days
The month with the highest number of snowfall days is January (9.6 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
Westwood, 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 3min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Westwood, IA
- Average sunshine days in December: 18 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).
Average UV index in December
Westwood, 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
Westwood, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).
Average visibility in December
Westwood, 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).
Westwood, Iowa, USA
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