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 corresponds with a minor reduction in the average high-temperature, down from November's frosty 49.8°F (9.9°C) to an icy 41°F (5°C). An average low-temperature of 29.5°F (-1.4°C) is observed during the December nights.Humidity
In Hummelstown, the average relative humidity in December is 79%.Rainfall
In Hummelstown, during December, the rain falls for 12 days and regularly aggregates up to 2.44" (62mm) of precipitation. Throughout the year, in Hummelstown, there are 162.3 rainfall days, and 30.71" (780mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Hummelstown. In Hummelstown, in December, snow falls for 5.2 days, with typically accumulated 1.73" (44mm) of snow. Throughout the year, in Hummelstown, there are 27.8 snowfall days, and 13.23" (336mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Hummelstown.On the first day of the month, sunrise is at 7:10 am and sunset at 4:41 pm. On the last day of December, in Hummelstown, sunrise is at 7:29 am and sunset at 4:50 pm EST.
Sunshine
In Hummelstown, the average sunshine in December is 4.6h.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 of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
Is it cold in Hummelstown during December?
What is the average humidity in December in Hummelstown?
How much does it rain in Hummelstown in December?
How many days does it snow in December in Hummelstown?
What is the month with the shortest days in Hummelstown?
What is the average length of the day in December in Hummelstown?
When is the sunrise / sunset in December in Hummelstown?
How many hours of sunshine does Hummelstown have in December?
What is the month with the lowest UV index in Hummelstown?
What is the UV index reading in December in Hummelstown?
Average temperature in December
Hummelstown, PA
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in December: 29.5°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in December
Hummelstown, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Hummelstown, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Hummelstown, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February and May (81%).
The months with the lowest relative humidity are March and April (76%).
Average rainfall in December
Hummelstown, PA
- Average rainfall in December: 2.44"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in December
Hummelstown, PA
- Average rainfall days in December: 12 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in December
Hummelstown, PA
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (3.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Hummelstown, PA
- Average snowfall days in December: 5.2 days
The month with the highest number of snowfall days is January (9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Hummelstown, 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 24min).
- Average sunshine in December: 4h and 4min
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 30min).
Average sunshine days in December
Hummelstown, PA
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (10 days).
Average UV index in December
Hummelstown, PA
- Average UV index in December: 2
The months with the highest UV index are May, June and July (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
Hummelstown, PA
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Hummelstown, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, June, July, August, November and December (6mi).
The months with the lowest visibility are February, May, September and October (5mi).
Hummelstown, Pennsylvania, USA
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