December weather forecast
Winchester, IL

Share

Weather in December

The first month of the winter, December, is also an icy month in Winchester, Illinois, with an average temperature varying between 39.2°F (4°C) and 27.9°F (-2.3°C).

Temperature

As November shifts into December, a slight alteration in temperatures is observed, with average highs reducing from a cool 51.1°F (10.6°C) to an icy 39.2°F (4°C). During December, Winchester experiences an average low-temperature of 27.9°F (-2.3°C) at night.

Humidity

In Winchester, the average relative humidity in December is 77%.

Rainfall

January, February and December are months with the least rain when the rain falls for 8.1 days and typically aggregates up to 1.73" (44mm) of rain.

Snowfall

Months with snowfall are January through April, October through December. In Winchester, Illinois, in December, snow falls for 5.9 days, with typically accumulated 1.54" (39mm) of snow. In Winchester, Illinois, during the entire year, snow falls for 30.2 days and aggregates up to 10.75" (273mm) 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 7:04 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:47 pm CST.

Sunshine

In Winchester, the average sunshine in December is 4.8h.

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 value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Enhance your sun protection with tightly woven, yet airy clothing. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In Winchester, 39.2°F (4°C) is the average high-temperature and 27.9°F (-2.3°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is computed to be 91.4°F (33°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

What is the driest month?

The months with the least rainfall are January, February and December Rain falls for 8.1 days and accumulates 1.73" (44mm) of rain.

How much does it rain in December?

In Winchester, in December, during 8.1 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 5.9 days. Throughout December, 1.54" (39mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

How many hours of daylight does Winchester have in December?

The average day length in December is 9h and 25min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:04 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:47 pm CST.

How many hours of sunshine does Winchester have in December?

In Winchester, Illinois, 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.

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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
Winchester, IL

Average temperature in December - Winchester, IL
  • Average high temperature in December: 39.2°F

The warmest month (with the highest average high temperature) is July (84°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
Winchester, IL

Average pressure in December - Winchester, 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
Winchester, IL

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

The windiest months (with the highest average wind speed) are January and April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in December
Winchester, IL

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

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Winchester, IL

Average rainfall in December - Winchester, IL
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January, February and December (1.73").

Average rainfall days in December
Winchester, IL

Average rainfall days in December - Winchester, IL
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (7.2 days).

Average snowfall in December
Winchester, IL

Average snowfall in December - Winchester, IL
  • Average snowfall in December: 1.54"

The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Winchester, IL

Average snowfall days in December - Winchester, IL
  • Average snowfall days in December: 5.9 days

The month with the highest number of snowfall days is January (9.8 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
Winchester, IL

Average daylight in December / Average sunshine in December - Winchester, 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 month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in December
Winchester, IL

Average sunshine days in December - Winchester, IL
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.6 days).

Average UV index in December
Winchester, IL

Average UV index in December - Winchester, 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
Winchester, IL

Average cloud cover in December - Winchester, 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 30).

Average visibility in December
Winchester, IL

Average visibility in December - Winchester, IL
  • 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).

Winchester, Illinois, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location