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
Observing a mild shift, the average high-temperature during December reduces from November's chilly 45.1°F (7.3°C) to a wintry 34.7°F (1.5°C). Throughout December in Mount Morris, a steady low-temperature average of 24.8°F (-4°C) is noted.Humidity
In December, the average relative humidity is 85%.Rainfall
In Mount Morris, New York, in December, during 6.4 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Mount Morris, during the entire year, the rain falls for 108.9 days and collects up to 7.8" (198mm) of precipitation.Snowfall
Months with snowfall in Mount Morris are January through May, October through December. In Mount Morris, during December, snow falls for 12.1 days and regularly aggregates up to 1.26" (32mm) of snow. In Mount Morris, during the entire year, snow falls for 59.7 days and aggregates up to 6.85" (174mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:41 am and sunset at 4:47 pm EST.
Sunshine
In Mount Morris, the average sunshine in December is 3.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 1 during December translates into the following guidance:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Mount Morris?
What is the average humidity in December in Mount Morris?
How many days does it rain in December in Mount Morris?
How much does it snow in Mount Morris in December?
What is the month with the shortest days in Mount Morris?
What is the average length of the day in December in Mount Morris?
What time are sunrise and sunset in December in Mount Morris?
How long on average sun shines in December in Mount Morris?
What are the months with the lowest UV index in Mount Morris?
What is the UV index intensity in December in Mount Morris?
Average temperature in December
Mount Morris, NY
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in December: 24.8°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in December
Mount Morris, NY
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Mount Morris, NY
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in December
Mount Morris, NY
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is May (77%).
Average rainfall in December
Mount Morris, NY
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is July (1.02").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in December
Mount Morris, NY
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is May (12.6 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in December
Mount Morris, NY
- Average snowfall in December: 1.26"
The month with the highest snowfall is February (1.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mount Morris, NY
- Average snowfall days in December: 12.1 days
The month with the highest number of snowfall days is February (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mount Morris, NY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 2h and 48min).
Average sunshine days in December
Mount Morris, NY
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is September (18.5 days).
The months with the least sunshine days are March and April (14 days).
Average UV index in December
Mount Morris, NY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Mount Morris, NY
- Average cloud cover in December: 69
The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Mount Morris, NY
- Average visibility in December: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
Mount Morris, New York, USA
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