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
As November transitions into December, Petersham sees a drop in the average high-temperature, transitioning from a chilly 45.9°F (7.7°C) to a wintry 35.1°F (1.7°C). During December, Petersham's temperature averages to a subzero cold 24.1°F (-4.4°C) at night.Humidity
The average relative humidity in December is 80%.Rainfall
In Petersham, during December, the rain falls for 10.2 days and regularly aggregates up to 2.76" (70mm) of precipitation. Throughout the year, there are 145 rainfall days, and 28.03" (712mm) of precipitation is accumulated.Snowfall
Months with snowfall in Petersham are January through May, October through December. In Petersham, in December, snow falls for 8.1 days, with typically accumulated 4.8" (122mm) of snow. In Petersham, during the entire year, snow falls for 43.1 days and aggregates up to 25.75" (654mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 6:59 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:25 pm EST.
Sunshine
In December, the average sunshine is 4.7h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. To guard against the harmful effects of the Sun, minimize exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in Petersham in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Petersham have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Petersham have in December?
When is the lowest UV index?
How high is the UV index in December in Petersham?
Average temperature in December
Petersham, MA
- Average high temperature in December: 35.1°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in December
Petersham, MA
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Petersham, MA
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Petersham, MA
- Average humidity in December: 80%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Petersham, MA
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is October (2.8").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Petersham, MA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in December
Petersham, MA
- Average snowfall in December: 4.8"
The month with the highest snowfall is February (6.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Petersham, MA
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Petersham, MA
- 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 6min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Petersham, MA
- Average sunshine days in December: 15.8 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (13 days).
Average UV index in December
Petersham, MA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Petersham, MA
- Average cloud cover in December: 48
The months with the most cloud cover are February and March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Petersham, MA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Petersham, Massachusetts, USA
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