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 corresponds with a temperature reduction, down from November's frosty 47.7°F (8.7°C) to an icy 36.5°F (2.5°C). Gridley reports a consistent average low-temperature of 25.9°F (-3.4°C) throughout December nights.Humidity
The average relative humidity in December is 81%.Rainfall
In December, the rain falls for 5.9 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. Throughout the year, there are 131.6 rainfall days, and 18.86" (479mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Gridley, during December, snow falls for 5.9 days and regularly aggregates up to 1.26" (32mm) of snow. Throughout the year, there are 30.1 snowfall days, and 9.17" (233mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:38 pm CST.
Sunshine
The average sunshine in December is 4.3h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 1 in December translates into these instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December in Gridley?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Gridley have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Gridley have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Gridley, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in December
Gridley, IL
- Average pressure in December: 30.11"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
Gridley, IL
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Gridley, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Gridley, IL
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Gridley, IL
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in December
Gridley, IL
- Average snowfall in December: 1.26"
The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Gridley, IL
- Average snowfall days in December: 5.9 days
The month with the highest number of snowfall days is January (10.6 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
Gridley, 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 18min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Gridley, IL
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Gridley, 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
Gridley, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Gridley, 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).
Gridley, Illinois, USA
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