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
As November transitions into December, Castalia sees a drop in the average high-temperature, transitioning from a frosty 47.1°F (8.4°C) to a cold 37°F (2.8°C). Castalia maintains a near steady average temperature of 30°F (-1.1°C) during the nights of December, demonstrating little drop from daytime highs.Humidity
The average relative humidity in December is 81%.Rainfall
February and December are months with the least rain when the rain falls for 9.8 days and typically aggregates up to 1.61" (41mm) of rain.Snowfall
Months with snowfall are January through April, November and December. In Castalia, in December, snow falls for 7.7 days, with typically accumulated 1.57" (40mm) of snow. In Castalia, during the entire year, snow falls for 41.3 days and aggregates up to 10.87" (276mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:38 am and sunset at 5:02 pm. On the last day of December, in Castalia, sunrise is at 7:57 am and sunset at 5:11 pm EST.
Sunshine
In December, the average sunshine in Castalia is 3.5h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 1 during December translates into the following directions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Castalia?
What is the average humidity in December in Castalia?
What is the driest month in Castalia?
How much does it rain in Castalia in December?
How much does it snow in Castalia in December?
What is the month with the shortest days in Castalia?
What is the average length of the day in December in Castalia?
What time are sunrise and sunset in December in Castalia?
How many hours of sunshine does Castalia have in December?
When is the lowest UV index in Castalia?
How high is the UV index in December in Castalia?
Average temperature in December
Castalia, OH
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Castalia, OH
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Castalia, OH
- Average wind speed in December: 12.4mph
The windiest month (with the highest average wind speed) is January (12.6mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in December
Castalia, OH
- Average humidity in December: 81%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Castalia, OH
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is June (4.41").
The driest months (with the least rainfall) are February and December (1.61").
Average rainfall days in December
Castalia, OH
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (17.8 days).
The months with the least rainy days are January and February (7.8 days).
Average snowfall in December
Castalia, OH
- Average snowfall in December: 1.57"
The month with the highest snowfall is February (3.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Castalia, OH
- Average snowfall days in December: 7.7 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Castalia, OH
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in December
Castalia, OH
- Average sunshine days in December: 11.3 days
The month with the most sunshine days is March (14.1 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in December
Castalia, OH
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Castalia, OH
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Castalia, OH
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Castalia, Ohio, USA
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