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
Transitioning from November to December involves a subtle drop in average high-temperatures, descending from an enjoyable 65.1°F (18.4°C) to a still refreshing 59°F (15°C). During December, the temperature in Harleyville is averaged to a low of 43.2°F (6.2°C) at night.Humidity
The months with the highest humidity in Harleyville are May, August, September and December, with an average relative humidity of 77%.Rainfall
In Harleyville, in December, during 9.7 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Harleyville, during the entire year, the rain falls for 151.2 days and collects up to 23.46" (596mm) of precipitation.Snowfall
In Harleyville, snow does not fall in March through December.Daylight
December has the shortest days of the year in Harleyville, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 7:07 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:25 pm EST.
Sunshine
The month with the least sunshine in Harleyville is December, with an average of 5.5h of sunshine.UV index
January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 3 during December, leads to the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Harleyville in December?
What is the most humid month in Harleyville?
What is the average humidity in December in Harleyville?
How much does it rain in Harleyville in December?
When it does not snow in Harleyville?
Does it snow in Harleyville in December?
What is the month with the shortest days in Harleyville?
What is the average length of the day in December in Harleyville?
When are sunrise and sunset in December in Harleyville?
What is the month with the least sunshine in Harleyville?
How long on average sun shines in December in Harleyville?
When is the lowest UV index in Harleyville?
What is the UV index intensity in December in Harleyville?
Average temperature in December
Harleyville, SC
- Average high temperature in December: 59°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (55.2°F).
- Average low temperature in December: 43.2°F
The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in December
Harleyville, SC
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Harleyville, SC
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Harleyville, SC
- Average humidity in December: 77%
The months with the highest relative humidity are May, August, September and December (77%).
The month with the lowest relative humidity is January (72%).
Average rainfall in December
Harleyville, SC
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is November (0.91").
Average rainfall days in December
Harleyville, SC
- Average rainfall days in December: 9.7 days
The month with the highest number of rainy days is August (19.5 days).
The month with the least rainy days is November (6.8 days).
Average snowfall in December
Harleyville, SC
- Average snowfall in December: 0"
The months with the highest snowfall are January and February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Harleyville, SC
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Harleyville, SC
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
Harleyville, SC
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is August (8.7 days).
Average UV index in December
Harleyville, SC
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in December
Harleyville, SC
- Average cloud cover in December: 42
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in December
Harleyville, SC
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Harleyville, South Carolina, USA
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