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 sea temperature 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
Rocky River's average high-temperature decreases in December, falling from a frosty 47.3°F (8.5°C) in November to an icy 37.9°F (3.3°C). Rocky River, during December nights, records a temperature marginally cooler than the daytime average, at a subzero cold 30.2°F (-1°C).Humidity
In Rocky River, the average relative humidity in December is 81%.Rainfall
In Rocky River, during December, the rain falls for 10.7 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, there are 172.7 rainfall days, and 33.27" (845mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Rocky River, Ohio, in December, snow falls for 12.5 days, with typically accumulated 3.74" (95mm) of snow. In Rocky River, during the entire year, snow falls for 59.9 days and aggregates up to 17.91" (455mm) of snow.Ocean temperature
In Rocky River, in December, the average water temperature is 39.4°F (4.1°C).Note: In relation to swimming, this scenario is excessively cold, perilous, and a direct threat to life. Hypothermia strikes rapidly in the absence of insulated waterproof gear.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:34 am and sunset at 4:58 pm. On the last day of December, in Rocky River, Ohio, sunrise is at 7:53 am and sunset at 5:07 pm EST.
Sunshine
In December, the average sunshine is 3.1h.UV index
February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
How cold is the water in December?
What is the month with the shortest days?
What is the average length of the day in December in Rocky River?
When is the sunrise / sunset in December?
How many hours of sunshine does Rocky River have in December?
What are the months with the lowest UV index?
How high is the UV index in December in Rocky River?
Average temperature in December
Rocky River, OH
- Average high temperature in December: 37.9°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 30.2°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 (21.9°F).
Average pressure in December
Rocky River, OH
- Average pressure in December: 30.09"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
Rocky River, OH
- Average wind speed in December: 11.3mph
The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in December
Rocky River, OH
- Average humidity in December: 81%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (74%).
Average rainfall in December
Rocky River, OH
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is February (2.17").
Average rainfall days in December
Rocky River, OH
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is April (17.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Rocky River, OH
- Average snowfall in December: 3.74"
The month with the highest snowfall is February (4.84").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Rocky River, OH
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is January (16.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Rocky River, OH
- Average sea temperature in December: 39.3°F
The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (33.2°F).
Average daylight in December /
Average sunshine in December
Rocky River, 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in December
Rocky River, OH
- Average sunshine days in December: 8.8 days
The month with the most sunshine days is October (12 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in December
Rocky River, OH
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Rocky River, OH
- Average cloud cover in December: 68
The month with the most cloud cover is January (Cloud cover 73).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in December
Rocky River, 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).
Rocky River, Ohio, USA
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