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
Jefferson in December demonstrates a small temperature transition, adjusting from an average high of a chilly 48.2°F (9°C) in November to a wintry 37.6°F (3.1°C). Throughout the month of December, Jefferson observes an average nighttime temperature of 27.3°F (-2.6°C).Humidity
In Jefferson, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 7.4 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. In Jefferson, Indiana, during the entire year, the rain falls for 139.5 days and collects up to 18.07" (459mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Jefferson, in December, snow falls for 5.3 days, with typically accumulated 1.57" (40mm) of snow. In Jefferson, during the entire year, snow falls for 28.4 days and aggregates up to 7.44" (189mm) 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 7:50 am and sunset at 5:20 pm. On the last day of December, sunrise is at 8:08 am and sunset at 5:30 pm EST.
Sunshine
In Jefferson, the average sunshine in December is 4.2h.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Jefferson. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 2 during December translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Jefferson have in December?
What time are sunrise and sunset in December in Jefferson?
How long on average sun shines in December in Jefferson?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Jefferson, IN
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Jefferson, IN
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Jefferson, IN
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Jefferson, IN
- Average humidity in December: 82%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Jefferson, IN
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is June (2.28").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days in December
Jefferson, IN
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Jefferson, IN
- Average snowfall in December: 1.57"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Jefferson, IN
- Average snowfall days in December: 5.3 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jefferson, IN
- 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 1min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Jefferson, IN
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Jefferson, IN
- 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, October, November and December (UV index 2).
Average cloud cover in December
Jefferson, IN
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Jefferson, IN
- 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).
Jefferson, Indiana, USA
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