December weather forecastRotterdam, NY
December
Weather in December
The first month of the winter, December, is also a wintry month in Rotterdam, New York, with an average temperature varying between 24.6°F (-4.1°C) and 34.2°F (1.2°C).Temperature
With December's arrival, Rotterdam's weather changes as the average high-temperature falls from a chilly 45.5°F (7.5°C) in November to a wintry 34.2°F (1.2°C). December nights observe an average temperature dip to a freezing cold 24.6°F (-4.1°C).Humidity
In December, the average relative humidity is 81%.Rainfall
In Rotterdam, in December, it is raining for 7.8 days, with typically 2.05" (52mm) of accumulated precipitation. In Rotterdam, during the entire year, the rain falls for 137.4 days and collects up to 25.75" (654mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Rotterdam, in December, snow falls for 6.4 days, with typically accumulated 5.24" (133mm) of snow. In Rotterdam, during the entire year, snow falls for 36.5 days and aggregates up to 22.56" (573mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:07 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:32 pm EST.
Sunshine
The average sunshine in December is 4.2h.UV index
With an average maximum UV index of 1, December is the month 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 UV index of 1 in December translates into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rotterdam, NY
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in December
Rotterdam, NY
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Rotterdam, NY
- Average wind speed in December: 7.4mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Rotterdam, NY
- Average humidity in December: 81%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Rotterdam, NY
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is January (1.57").
Average rainfall days in December
Rotterdam, NY
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in December
Rotterdam, NY
- Average snowfall in December: 5.24"
The month with the highest snowfall is February (6.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rotterdam, NY
- Average snowfall days in December: 6.4 days
The month with the highest number of snowfall days is February (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rotterdam, NY
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Rotterdam, NY
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is April (12.6 days).
Average UV index in December
Rotterdam, NY
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rotterdam, NY
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Rotterdam, NY
- Average visibility in December: 6mi
The months with the highest visibility are April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January, February, March, May and September (5mi).
