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
Harlan's transition into December involves a shift in temperature, receding from a chilly 47.3°F (8.5°C) in November to a wintry 36.1°F (2.3°C). An average low-temperature of 26.8°F (-2.9°C) is observed in Harlan during the December nights.Humidity
In December, the average relative humidity is 83%.Rainfall
In December, the rain falls for 9.2 days. Throughout December, 0.94" (24mm) of precipitation is accumulated. In Harlan, during the entire year, the rain falls for 140.8 days and collects up to 16.22" (412mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Harlan, Indiana, in December, during 9.5 snowfall days, 1.1" (28mm) of snow is typically accumulated. Throughout the year, in Harlan, Indiana, there are 45.1 snowfall days, and 7.8" (198mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Harlan, Indiana.On the first day of the month, sunrise is at 7:46 am and sunset at 5:11 pm. On the last day of December, sunrise is at 8:05 am and sunset at 5:20 pm EST.
Sunshine
In December, the average sunshine in Harlan, Indiana, is 3.8h.UV index
The month with the lowest UV index in Harlan is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.Note: An average UV index of 1 in December transforms into this advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Harlan in December?
What is the average humidity in December in Harlan?
How much does it rain in Harlan in December?
How many days does it snow in December in Harlan?
What is the month with the shortest days in Harlan?
What is the average length of the day in December in Harlan?
When is the sunrise / sunset in December in Harlan?
How long on average sun shines in December in Harlan?
When is the lowest UV index in Harlan?
What is the UV index reading in December in Harlan?
Average temperature in December
Harlan, IN
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in December
Harlan, IN
- Average pressure in December: 30.1"Hg
The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Harlan, IN
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in December
Harlan, IN
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Harlan, IN
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days in December
Harlan, IN
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (6.5 days).
Average snowfall in December
Harlan, IN
- Average snowfall in December: 1.1"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Harlan, IN
- Average snowfall days in December: 9.5 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Harlan, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Harlan, IN
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in December
Harlan, IN
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Harlan, IN
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Harlan, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Harlan, Indiana, USA
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