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
The shift from November to December involves a decrease in the average high-temperature, from a chilly 49.1°F (9.5°C) to a cold 39.2°F (4°C). Port William experiences an average temperature drop to a freezing cold 29.1°F (-1.6°C) during December nights.Humidity
In December, the average relative humidity is 82%.Rainfall
In Port William, in December, it is raining for 12.1 days, with typically 2.76" (70mm) of accumulated precipitation. In Port William, during the entire year, the rain falls for 169.3 days and collects up to 32.99" (838mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Port William. In Port William, in December, snow falls for 10 days, with typically accumulated 2.8" (71mm) of snow. Throughout the year, in Port William, there are 43.7 snowfall days, and 14.45" (367mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:37 am and sunset at 5:11 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 5:21 pm EST.
Sunshine
In December, the average sunshine is 4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Port William. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
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 in Port William?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Port William, OH
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in December
Port William, 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
Port William, OH
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Port William, OH
- Average humidity in December: 82%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Port William, OH
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Port William, OH
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is February (9.4 days).
Average snowfall in December
Port William, OH
- Average snowfall in December: 2.8"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Port William, OH
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Port William, OH
- Average daylight in December: 9h and 2min
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 24min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Port William, OH
- Average sunshine days in December: 11.3 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (9.2 days).
Average UV index in December
Port William, 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
Port William, OH
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Port William, OH
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Port William, Ohio, USA
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