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
Transition into December marks a drop in the average high-temperature, moving from a frosty 49.1°F (9.5°C) in November to a cold 39.2°F (4°C). The temperature lowers to an average of 28.2°F (-2.1°C) during December nights.Humidity
The average relative humidity in December in Forest Hills is 84%.Rainfall
In Forest Hills, in December, during 12.4 rainfall days, 2.91" (74mm) of precipitation is typically accumulated. In Forest Hills, during the entire year, the rain falls for 182.2 days and collects up to 34.84" (885mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Forest Hills, in December, snow falls for 13 days, with typically accumulated 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 in Forest Hills is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:23 am and sunset at 4:53 pm. On the last day of December, sunrise is at 7:42 am and sunset at 5:03 pm EST.
Sunshine
In Forest Hills, the average sunshine in December is 3.2h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 1 in December translates into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Always opt for UVA and UVB-resistant sunglasses on radiant days. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
Is December cold in Forest Hills?
What is the average humidity in December in Forest Hills?
How much does it rain in Forest Hills in December?
How much does it snow in Forest Hills in December?
What is the month with the shortest days in Forest Hills?
How many hours of daylight does Forest Hills have in December?
When is the sunrise / sunset in December in Forest Hills?
How long on average sun shines in December in Forest Hills?
What is the month with the lowest UV index in Forest Hills?
What is the UV index intensity in December in Forest Hills?
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 2min
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 1min
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).
Forest Hills, Pennsylvania, USA
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