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
December brings a minor decrease, with the average high-temperature reducing from a cool 51.3°F (10.7°C) in November to an icy 41.4°F (5.2°C). Throughout the month of December, San Jacinto observes an average nighttime temperature of 30°F (-1.1°C).Humidity
The months with the highest humidity are January, February and December, with an average relative humidity of 81%.Rainfall
In San Jacinto, in December, during 10.9 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In San Jacinto, during the entire year, the rain falls for 153.7 days and collects up to 29.57" (751mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In San Jacinto, during December, snow falls for 7.1 days and regularly aggregates up to 1.65" (42mm) of snow. Throughout the year, there are 31.7 snowfall days, and 9.17" (233mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:42 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 5:30 pm EST.
Sunshine
The average sunshine in December in San Jacinto is 4.1h.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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A maximum UV index of 2 in December translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Opt for tightly woven and loose clothing to enhance protection from the Sun. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What are the most humid months?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
San Jacinto, IN
- Average high temperature in December: 41.4°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (35.8°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
San Jacinto, IN
- Average pressure in December: 30.13"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
San Jacinto, IN
- Average wind speed in December: 8mph
The windiest months (with the highest average wind speed) are January, February and April (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
San Jacinto, IN
- Average humidity in December: 81%
The months with the highest relative humidity are January, February and December (81%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
San Jacinto, IN
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is May (3.46").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in December
San Jacinto, IN
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (9 days).
Average snowfall in December
San Jacinto, IN
- Average snowfall in December: 1.65"
The month with the highest snowfall is March (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
San Jacinto, IN
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is January (8.3 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
San Jacinto, IN
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
San Jacinto, IN
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is October (18.2 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in December
San Jacinto, 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, November and December (UV index 2).
Average cloud cover in December
San Jacinto, IN
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
San Jacinto, IN
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, June, October and November (6mi).
The months with the lowest visibility are February, May, July, August, September and December (5mi).
San Jacinto, Indiana, USA
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