December weather forecastForest Hills, PA
December
Weather in December
December, the first month of the winter in Forest Hills, is also an icy month, with an average temperature fluctuating between 28.2°F (-2.1°C) and 39.2°F (4°C).Temperature
The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 49.1°F (9.5°C) to a cold 39.2°F (4°C). Forest Hills, during December, witnesses an average low-temperature of 28.2°F (-2.1°C).Humidity
In Forest Hills, the average relative humidity in December is 84%.Rainfall
In Forest Hills, in December, it is raining for 12.4 days, with typically 2.91" (74mm) of accumulated precipitation. Throughout the year, there are 182.2 rainfall days, and 34.84" (885mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Forest Hills, during December, snow falls for 13 days and regularly aggregates up to 4.76" (121mm) of snow. Throughout the year, there are 62.9 snowfall days, and 25.51" (648mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:23 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:03 pm EST.
Sunshine
In December, the average sunshine is 3.2h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Forest Hills, PA
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in December
Forest Hills, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Forest Hills, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Forest Hills, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in December
Forest Hills, PA
- Average rainfall in December: 2.91"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is November (2.17").
Average rainfall days in December
Forest Hills, PA
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is May (21 days).
The month with the least rainy days is February (10.4 days).
Average snowfall in December
Forest Hills, PA
- Average snowfall in December: 4.76"
The month with the highest snowfall is January (6.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Forest Hills, PA
- Average snowfall days in December: 13 days
The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Forest Hills, PA
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in December
Forest Hills, PA
- Average sunshine days in December: 9.7 days
The month with the most sunshine days is November (14.8 days).
The month with the least sunshine days is January (7.4 days).
Average UV index in December
Forest Hills, PA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Forest Hills, PA
- Average cloud cover in December: 66
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Forest Hills, PA
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January and February (4mi).
