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 sea temperature 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 Falmouth enters December, the average high-temperature subtly lowers from the a cool 50.9°F (10.5°C) of November to a frosty 43.7°F (6.5°C). Nights in December cool down, indicating a minor disparity from daytime highs with an average low-temperature of 35.8°F (2.1°C).Humidity
The average relative humidity in December is 75%.Rainfall
In Falmouth, in December, it is raining for 5.2 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 69.4 rainfall days, and 5.31" (135mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March and December. The month with the most snowfall is December, when snow falls for 2.5 days and typically aggregates up to 0.24" (6mm) of snow.Ocean temperature
In Falmouth, the average seawater temperature in December is 46.9°F (8.3°C).Note: Swimming in 46.9°F (8.3°C) feels unbearing at 55.4°F (13°C) and can be life-risking below 50°F (10°C), causing breathing issues and cold shock, depending on a person's capacity.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December in Falmouth, sunrise is at 6:50 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 4:22 pm EST.
Sunshine
The months with the least sunshine are February and December, with an average of 4.7h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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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 December?
When does it snow the most?
When does it start to snow?
How cold is the water in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What are the months with the least sunshine?
How many hours of sunshine does Falmouth have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Falmouth, MA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).
Average pressure in December
Falmouth, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Falmouth, MA
- Average wind speed in December: 15mph
The windiest month (with the highest average wind speed) is January (15.3mph).
The calmest months (with the lowest average wind speed) are July and August (10.2mph).
Average humidity in December
Falmouth, MA
- Average humidity in December: 75%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is November (74%).
Average rainfall in December
Falmouth, MA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is October (0.71").
The driest months (with the least rainfall) are July, August and September (0.31").
Average rainfall days in December
Falmouth, MA
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is July (7.7 days).
The month with the least rainy days is September (4.6 days).
Average snowfall in December
Falmouth, MA
- Average snowfall in December: 0.24"
The month with the highest snowfall is December (0.24").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Falmouth, MA
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Falmouth, MA
- Average sea temperature in December: 46.9°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in December /
Average sunshine in December
Falmouth, MA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in December
Falmouth, MA
- Average sunshine days in December: 23.2 days
The month with the most sunshine days is September (23.9 days).
The month with the least sunshine days is February (20.8 days).
Average UV index in December
Falmouth, MA
- Average UV index in December: 2
The months with the highest UV index are 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
Falmouth, MA
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Falmouth, MA
- 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).
Falmouth, Massachusetts, USA
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