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 arrival, Westfield sees a decrease in average high-temperatures, moving from a fresh 50.5°F (10.3°C) in November to a wintry 39.7°F (4.3°C). In December, Westfield experiences an average nighttime temperature of 28.9°F (-1.7°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In Westfield, in December, during 6.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Westfield, there are 115.9 rainfall days, and 11.26" (286mm) of precipitation is accumulated.Snowfall
Months with snowfall in Westfield are January through April, November and December. The month with the most snowfall is December, when snow falls for 4 days and typically aggregates up to 0.47" (12mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:53 am and sunset at 4:28 pm. On the last day of December, in Westfield, sunrise is at 7:12 am and sunset at 4:38 pm CST.
Sunshine
The average sunshine in December is 4.4h.UV index
December is the month with the lowest UV index in Westfield, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
Is it cold in Westfield during December?
What is the average humidity in December in Westfield?
How many days does it rain in December in Westfield?
What is the snowiest month in Westfield?
How many days does it snow in December in Westfield?
What is the month with the shortest days in Westfield?
How many hours of daylight does Westfield have in December?
When are sunrise and sunset in December in Westfield?
How long on average sun shines in December in Westfield?
When is the lowest UV index in Westfield?
How high is the UV index in December in Westfield?
Average temperature in December
Westfield, IL
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in December: 28.9°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
Westfield, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Westfield, IL
- Average wind speed in December: 9.6mph
The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).
Average humidity in December
Westfield, IL
- 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
Westfield, IL
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is April (1.54").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in December
Westfield, IL
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6 days).
Average snowfall in December
Westfield, IL
- Average snowfall in December: 0.47"
The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Westfield, IL
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Westfield, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Westfield, IL
- Average sunshine days in December: 20.8 days
The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index in December
Westfield, IL
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Westfield, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in December
Westfield, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Westfield, Illinois, USA
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