December weather forecastMerwin, OH
December
Weather in December
The first month of the winter, December, is also an icy month in Merwin, Ohio, with an average temperature varying between 41.7°F (5.4°C) and 30.6°F (-0.8°C).Temperature
A moderate decline in the average high-temperature is seen during December, decreasing from a cool 51.3°F (10.7°C) in November to a cold 41.7°F (5.4°C). In Merwin, December nights cool down to an average of 30.6°F (-0.8°C).Humidity
January, February and December, with an average relative humidity of 81%, are the most humid months.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 1.46" (37mm) of precipitation is accumulated. In Merwin, during the entire year, the rain falls for 139.9 days and collects up to 18.11" (460mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Merwin, during December, snow falls for 6.7 days and regularly aggregates up to 0.98" (25mm) of snow. Throughout the year, there are 28.2 snowfall days, and 6.46" (164mm) 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 7:37 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 5:24 pm EST.
Sunshine
In Merwin, the average sunshine in December 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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Merwin, OH
- Average high temperature in December: 41.7°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 (36.1°F).
- Average low temperature in December: 30.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Merwin, OH
- 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
Merwin, OH
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.1mph).
Average humidity in December
Merwin, OH
- Average humidity in December: 81%
The months with the highest relative humidity are January, February and December (81%).
The months with the lowest relative humidity are August, September and October (75%).
Average rainfall in December
Merwin, OH
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days in December
Merwin, OH
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in December
Merwin, OH
- Average snowfall in December: 0.98"
The month with the highest snowfall is March (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Merwin, OH
- Average snowfall days in December: 6.7 days
The month with the highest number of snowfall days is January (6.9 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
Merwin, OH
- Average daylight in December: 9h and 30min
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 6min
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 48min).
Average sunshine days in December
Merwin, OH
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in December
Merwin, OH
- 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
Merwin, OH
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Merwin, OH
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
