December weather forecast
Pittsfield, IL

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Weather in December

December, the first month of the winter in Pittsfield, is still a cold month, with an average temperature varying between 27.9°F (-2.3°C) and 39°F (3.9°C).

Temperature

December's arrival comes with a decrease in the average high-temperature, moving from a fresh 50.9°F (10.5°C) in November to a wintry 39°F (3.9°C). In Pittsfield, in December, the average low-temperature is a subzero cold 27.9°F (-2.3°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

In Pittsfield, in December, it is raining for 7 days, with typically 0.87" (22mm) of accumulated precipitation. In Pittsfield, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 4.2 days. Throughout December, 0.79" (20mm) of snow is accumulated. In Pittsfield, during the entire year, snow falls for 21.9 days and aggregates up to 5.67" (144mm) of snow.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:49 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 2 in December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature, in December, in Pittsfield, is 39°F (3.9°C), while the average low-temperature is 27.9°F (-2.3°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 91.4°F (33°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In Pittsfield, in December, during 7 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Pittsfield, in December, during 4.2 snowfall days, 0.79" (20mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 26min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:49 pm CST.

How many hours of sunshine does Pittsfield have in December?

The average sunshine duration in December is 4.8h.

When is the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Pittsfield, IL

Average temperature in December - Pittsfield, IL
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Pittsfield, IL

Average pressure in December - Pittsfield, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Pittsfield, IL

Average wind speed in December - Pittsfield, IL
  • Average wind speed in December: 9.4mph

The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in December
Pittsfield, IL

Average humidity in December - Pittsfield, IL
  • Average humidity in December: 77%

The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Pittsfield, IL

Average rainfall in December - Pittsfield, IL
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
Pittsfield, IL

Average rainfall days in December - Pittsfield, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Pittsfield, IL

Average snowfall in December - Pittsfield, IL
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Pittsfield, IL

Average snowfall days in December - Pittsfield, IL
  • Average snowfall days in December: 4.2 days

The month with the highest number of snowfall days is January (6.3 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
Pittsfield, IL

Average daylight in December / Average sunshine in December - Pittsfield, 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 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in December
Pittsfield, IL

Average sunshine days in December - Pittsfield, IL
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in December
Pittsfield, IL

Average UV index in December - Pittsfield, IL
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Pittsfield, IL

Average cloud cover in December - Pittsfield, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in December
Pittsfield, IL

Average visibility in December - Pittsfield, IL
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Pittsfield, Illinois, USA

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