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
Lancaster in December demonstrates a small temperature transition, adjusting from an average high of a cool 52.9°F (11.6°C) in November to a frosty 42.8°F (6°C). Lancaster witnesses a consistent average low-temperature of 31.3°F (-0.4°C) throughout December.Humidity
In Lancaster, the average relative humidity in December is 78%.Rainfall
In Lancaster, during December, the rain falls for 10.3 days and regularly aggregates up to 2.6" (66mm) of precipitation. Throughout the year, there are 155.6 rainfall days, and 34.65" (880mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Lancaster, during December, snow falls for 4.2 days and regularly aggregates up to 1.14" (29mm) of snow. In Lancaster, during the entire year, snow falls for 21 days and aggregates up to 5.39" (137mm) of snow.Daylight
December has the shortest days of the year in Lancaster, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:50 am and sunset at 4:30 pm. On the last day of December, in Lancaster, sunrise is at 7:08 am and sunset at 4:40 pm CST.
Sunshine
The average sunshine in December in Lancaster is 4.6h.UV index
The months with the lowest UV index in Lancaster, Illinois, are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 2 suggests this advice:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is it in Lancaster in December?
What is the average humidity in December in Lancaster?
How much does it rain in Lancaster in December?
How many days does it snow in December in Lancaster?
What is the month with the shortest days in Lancaster?
What is the average length of the day in December in Lancaster?
When is the sunrise / sunset in December in Lancaster?
How long on average sun shines in December in Lancaster?
What is the month with the lowest UV index in Lancaster?
What is the UV index reading in December in Lancaster?
Average temperature in December
Lancaster, IL
- Average high temperature in December: 42.8°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 31.3°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in December
Lancaster, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Lancaster, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in December
Lancaster, IL
- Average humidity in December: 78%
The months with the highest relative humidity are May and July (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Lancaster, IL
- Average rainfall in December: 2.6"
The wettest month (with the highest rainfall) is April (4.72").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Lancaster, IL
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in December
Lancaster, IL
- Average snowfall in December: 1.14"
The month with the highest snowfall is January (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Lancaster, IL
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (6.8 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
Lancaster, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Lancaster, IL
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (10.3 days).
Average UV index in December
Lancaster, IL
- Average UV index in December: 2
The months with the highest UV index are May, 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
Lancaster, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in December
Lancaster, 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).
Lancaster, Illinois, USA
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