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
The arrival of December signals a shift in temperature, down from a frosty 43.5°F (6.4°C) in November to a wintry 33.8°F (1°C). December sees the temperature falling to a mean low of 23.9°F (-4.5°C).Humidity
The average relative humidity in December is 88%.Rainfall
In December, the rain falls for 8.9 days. Throughout December, 2.52" (64mm) of precipitation is accumulated. Throughout the year, in Bullis Mills, there are 168.9 rainfall days, and 30" (762mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, in Bullis Mills, it is snowing for 18.8 days. Throughout December, 9.25" (235mm) of snow is accumulated. In Bullis Mills, during the entire year, snow falls for 92.6 days and aggregates up to 43.58" (1107mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:41 am and sunset at 4:52 pm EST.
Sunshine
In December, the average sunshine is 2.5h.UV index
The months with the lowest UV index in Bullis Mills, Pennsylvania, are January, February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 1 in December translates into the following instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Frequently asked questions
How cold is December in Bullis Mills?
What is the average humidity in December in Bullis Mills?
How much does it rain in Bullis Mills in December?
How much does it snow in Bullis Mills in December?
What is the month with the shortest days in Bullis Mills?
How many hours of daylight does Bullis Mills have in December?
What time are sunrise and sunset in December in Bullis Mills?
How many hours of sunshine does Bullis Mills have in December?
What is the month with the lowest UV index in Bullis Mills?
What is the UV index intensity in December in Bullis Mills?
Average temperature in December
Bullis Mills, PA
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in December
Bullis Mills, PA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Bullis Mills, PA
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Bullis Mills, PA
- Average humidity in December: 88%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are May, June and July (79%).
Average rainfall in December
Bullis Mills, PA
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is April (3.35").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in December
Bullis Mills, PA
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in December
Bullis Mills, PA
- Average snowfall in December: 9.25"
The month with the highest snowfall is February (10.63").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Bullis Mills, PA
- Average snowfall days in December: 18.8 days
The month with the highest number of snowfall days is January (20.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Bullis Mills, PA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 2h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Bullis Mills, PA
- Average sunshine days in December: 7.8 days
The month with the most sunshine days is September (12.4 days).
The month with the least sunshine days is February (5.9 days).
Average UV index in December
Bullis Mills, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in December
Bullis Mills, PA
- Average cloud cover in December: 77
The month with the most cloud cover is January (Cloud cover 79).
The months with the least cloud cover are July and August (Cloud cover 43).
Average visibility in December
Bullis Mills, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, October and November (5mi).
The months with the lowest visibility are January, February, August, September and December (4mi).
Bullis Mills, Pennsylvania, USA
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