December weather forecastSaint Marys, OH
December
Weather in December
The first month of the winter, December, is also a wintry month in Saint Marys, Ohio, with temperature in the range of an average low of 27.5°F (-2.5°C) and an average high of 37.8°F (3.2°C).Temperature
The shift from November to December corresponds with a decrease in the average high-temperature, down to an icy 37.8°F (3.2°C) from a chilly 48.4°F (9.1°C). Saint Marys's average low-temperature in December is measured at a subzero cold 27.5°F (-2.5°C).Humidity
January, February and December, with an average relative humidity of 83%, are the most humid months in Saint Marys, Ohio.Rainfall
In December, in Saint Marys, the rain falls for 9.9 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. Throughout the year, there are 161.4 rainfall days, and 29.25" (743mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Saint Marys, in December, during 9.9 snowfall days, 2.24" (57mm) of snow is typically accumulated. Throughout the year, in Saint Marys, there are 44.7 snowfall days, and 12.32" (313mm) of snow is accumulated.Daylight
With an average of 9h and 18min 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 5:11 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 5:20 pm EST.
Sunshine
In December, the average sunshine in Saint Marys is 3.9h.UV index
The month with the lowest UV index 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 radiation for average individuals.Note: The UV index of 1 during December leads to these advisories:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Marys, OH
- Average high temperature in December: 37.8°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in December: 27.5°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
Saint Marys, OH
- Average pressure in December: 30.11"Hg
The months with the highest atmospheric pressure are January and November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Saint Marys, OH
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Saint Marys, OH
- Average humidity in December: 83%
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Saint Marys, OH
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is February (1.85").
Average rainfall days in December
Saint Marys, OH
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in December
Saint Marys, OH
- Average snowfall in December: 2.24"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Saint Marys, OH
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Saint Marys, OH
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 3h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Saint Marys, OH
- Average sunshine days in December: 12.6 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is June (9.4 days).
Average UV index in December
Saint Marys, OH
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Saint Marys, OH
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Saint Marys, OH
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, August and September (5mi).
