December weather forecastPort Penn, DE
December
Weather in December
December, the first month of the winter in Port Penn, is also a frosty month, with an average temperature fluctuating between 45°F (7.2°C) and 34°F (1.1°C).Temperature
A subtle shift in Port Penn's weather is observed as November turns into December, with the average high temperature reducing from a cool 53.8°F (12.1°C) to a frosty 45°F (7.2°C). Throughout December, an average low-temperature of 34°F (1.1°C) is expected.Humidity
In December, the average relative humidity is 76%.Rainfall
In December, the rain falls for 9.8 days. Throughout December, 2.68" (68mm) of precipitation is accumulated. Throughout the year, there are 147.7 rainfall days, and 27.8" (706mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, November and December. In Port Penn, in December, snow falls for 2.3 days, with typically accumulated 0.51" (13mm) of snow. In Port Penn, during the entire year, snow falls for 13.8 days and aggregates up to 6.65" (169mm) of snow.Daylight
The month with the shortest days in Port Penn is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:04 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:48 pm EST.
Sunshine
In December, the average sunshine is 5.1h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Port Penn, DE
- Average high temperature in December: 45°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 (38.7°F).
- Average low temperature in December: 34°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in December
Port Penn, DE
- 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
Port Penn, DE
- Average wind speed in December: 8.1mph
The windiest months (with the highest average wind speed) are February, March and April (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Port Penn, DE
- Average humidity in December: 76%
The months with the highest relative humidity are May, June, September and October (77%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Port Penn, DE
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days in December
Port Penn, DE
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in December
Port Penn, DE
- Average snowfall in December: 0.51"
The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Port Penn, DE
- Average snowfall days in December: 2.3 days
The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Port Penn, DE
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Port Penn, DE
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (20.6 days).
The months with the least sunshine days are May and July (11.8 days).
Average UV index in December
Port Penn, DE
- 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 and December (UV index 2).
Average cloud cover in December
Port Penn, DE
- Average cloud cover in December: 46
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Port Penn, DE
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
