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
The arrival of December signals a shift in temperature, down from a chilly 48.4°F (9.1°C) in November to a cold 37°F (2.8°C). In Heyworth, December's nights observe an average temperature dip to a freezing cold 27°F (-2.8°C).Humidity
In Heyworth, the average relative humidity in December is 80%.Rainfall
December is the month with the least rainfall in Heyworth. Rain falls for 7.4 days and accumulates 0.67" (17mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Heyworth, in December, snow falls for 5.2 days, with typically accumulated 0.59" (15mm) of snow. In Heyworth, during the entire year, snow falls for 25.3 days and aggregates up to 5.28" (134mm) of snow.Daylight
December has the shortest days of the year in Heyworth, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:39 pm CST.
Sunshine
In Heyworth, the average sunshine in December is 4.4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is December in Heyworth?
What is the average humidity in December in Heyworth?
What is the driest month in Heyworth?
How much does it rain in Heyworth in December?
How much does it snow in Heyworth in December?
What is the month with the shortest days in Heyworth?
What is the average length of the day in December in Heyworth?
When are sunrise and sunset in December in Heyworth?
How long on average sun shines in December in Heyworth?
What is the month with the lowest UV index in Heyworth?
How high is the UV index in December in Heyworth?
Average temperature in December
Heyworth, IL
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 27°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Heyworth, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Heyworth, IL
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Heyworth, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Heyworth, IL
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is December (0.67").
Average rainfall days in December
Heyworth, IL
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in December
Heyworth, IL
- Average snowfall in December: 0.59"
The month with the highest snowfall is January (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Heyworth, IL
- Average snowfall days in December: 5.2 days
The month with the highest number of snowfall days is January (8.5 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
Heyworth, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
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 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Heyworth, IL
- Average sunshine days in December: 19.8 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in December
Heyworth, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Heyworth, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Heyworth, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Heyworth, Illinois, USA
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