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
With the beginning of December, the average high-temperature shows a decrease, transitioning from a fresh 50°F (10°C) in November to a cold 40.6°F (4.8°C). Mount Morris experiences an average low-temperature of 29.3°F (-1.5°C) in month of December.Humidity
In December, the average relative humidity in Mount Morris, Pennsylvania, is 83%.Rainfall
In Mount Morris, in December, during 13 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. Throughout the year, there are 187.8 rainfall days, and 36.46" (926mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Mount Morris, Pennsylvania, in December, snow falls for 13.1 days, with typically accumulated 6.14" (156mm) of snow. Throughout the year, there are 63.1 snowfall days, and 32.32" (821mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:22 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:06 pm EST.
Sunshine
The average sunshine in December in Mount Morris is 3.8h.UV index
The month with the lowest UV index in Mount Morris is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
Is December cold 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 is the month with the lowest UV index in Mount Morris?
How high is the UV index in December in Mount Morris?
Average temperature in December
Mount Morris, PA
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (34.5°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Mount Morris, PA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Mount Morris, PA
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in December
Mount Morris, PA
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (77%).
Average rainfall in December
Mount Morris, PA
- Average rainfall in December: 3.19"
The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in December
Mount Morris, PA
- Average rainfall days in December: 13 days
The month with the highest number of rainy days is May (20.5 days).
The month with the least rainy days is January (11.1 days).
Average snowfall in December
Mount Morris, PA
- Average snowfall in December: 6.14"
The month with the highest snowfall is February (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mount Morris, PA
- Average snowfall days in December: 13.1 days
The month with the highest number of snowfall days is January (17 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, PA
- 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: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Mount Morris, PA
- Average sunshine days in December: 10 days
The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is January (6.7 days).
Average UV index in December
Mount Morris, PA
- Average UV index in December: 1
The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Mount Morris, PA
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Mount Morris, PA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).
Mount Morris, Pennsylvania, USA
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