December weather forecastSpring Grove, PA
December
Weather in December
December, the first month of the winter in Spring Grove, is still a cold month, with an average temperature fluctuating between 30°F (-1.1°C) and 42.1°F (5.6°C).Temperature
The shift to December brings a decrease in the average high-temperature, falling from a fresh 51.1°F (10.6°C) in November to a cold 42.1°F (5.6°C). Spring Grove reports an average nighttime low-temperature of 30°F (-1.1°C) in December.Humidity
In December, the average relative humidity in Spring Grove is 79%.Rainfall
In Spring Grove, in December, it is raining for 8.1 days, with typically 0.75" (19mm) of accumulated precipitation. In Spring Grove, during the entire year, the rain falls for 124 days and collects up to 11.85" (301mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In Spring Grove, during December, snow falls for 3.4 days and regularly aggregates up to 0.55" (14mm) of snow. Throughout the year, there are 18.1 snowfall days, and 3.27" (83mm) 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 7:10 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:52 pm EST.
Sunshine
In December, the average sunshine is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Spring Grove, PA
- Average high temperature in December: 42.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in December
Spring Grove, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Spring Grove, PA
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is March (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Spring Grove, PA
- Average humidity in December: 79%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Spring Grove, PA
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (1.38").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Spring Grove, PA
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in December
Spring Grove, PA
- Average snowfall in December: 0.55"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Spring Grove, PA
- Average snowfall days in December: 3.4 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Spring Grove, PA
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Spring Grove, PA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is May (13.2 days).
Average UV index in December
Spring Grove, PA
- Average UV index in December: 2
The months with the highest UV index are May, 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
Spring Grove, PA
- Average cloud cover in December: 47
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Spring Grove, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
