December weather forecastPhoenixville, PA
December
Weather in December
December, the first month of the winter in Phoenixville, is also an icy month, with an average temperature varying between 30.9°F (-0.6°C) and 42.3°F (5.7°C).Temperature
The onset of December aligns with a soft reduction in the average high-temperature, gently falling from a fresh 51.1°F (10.6°C) in November to a cold 42.3°F (5.7°C). In the month of December, the nighttime temperature in Phoenixville dips to a steady average of 30.9°F (-0.6°C).Humidity
In December, the average relative humidity in Phoenixville is 79%.Rainfall
In Phoenixville, in December, during 7.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 132.3 rainfall days, and 13.98" (355mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In Phoenixville, in December, during 2.5 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Phoenixville, during the entire year, snow falls for 15.1 days and aggregates up to 2.2" (56mm) of snow.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 7:05 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.
Sunshine
The average sunshine in December is 4.8h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Phoenixville, PA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).
Average pressure in December
Phoenixville, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Phoenixville, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Phoenixville, PA
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Phoenixville, PA
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is August (1.77").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in December
Phoenixville, PA
- Average rainfall days in December: 7.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (6.9 days).
Average snowfall in December
Phoenixville, PA
- Average snowfall in December: 0.51"
The months with the highest snowfall are January and February (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Phoenixville, PA
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Phoenixville, 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: 4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Phoenixville, PA
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in December
Phoenixville, 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, March, November and December (UV index 2).
Average cloud cover in December
Phoenixville, PA
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Phoenixville, 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).
