December weather forecastRock Stream, NY
December
Weather in December
December, the first month of the winter in Rock Stream, is also an icy month, with temperature in the range of an average high of 34.7°F (1.5°C) and an average low of 25.2°F (-3.8°C).Temperature
Rock Stream, New York, experiences a temperature shift at the start of December, with average high-temperatures adjusting from a frosty 44.6°F (7°C) in November to a wintry 34.7°F (1.5°C). During the month of December, Rock Stream experiences a steady low-temperature average of 25.2°F (-3.8°C).Humidity
In December, the average relative humidity in Rock Stream is 85%.Rainfall
In Rock Stream, in December, it is raining for 10.2 days, with typically 2.28" (58mm) of accumulated precipitation. In Rock Stream, during the entire year, the rain falls for 168.6 days and collects up to 29.69" (754mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Rock Stream, New York, during December, snow falls for 15.9 days and regularly aggregates up to 7.13" (181mm) of snow. Throughout the year, there are 84 snowfall days, and 38.7" (983mm) of snow is accumulated.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 7:18 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:44 pm EST.
Sunshine
The average sunshine in December in Rock Stream is 3.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rock Stream, NY
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (58.3°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in December
Rock Stream, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rock Stream, NY
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Rock Stream, NY
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May and July (78%).
Average rainfall in December
Rock Stream, NY
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is October (3.07").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in December
Rock Stream, NY
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is February (8.1 days).
Average snowfall in December
Rock Stream, NY
- Average snowfall in December: 7.13"
The month with the highest snowfall is February (9.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rock Stream, NY
- Average snowfall days in December: 15.9 days
The month with the highest number of snowfall days is January (19.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rock Stream, NY
- Average daylight in December: 9h and 6min
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: 3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in December
Rock Stream, NY
- Average sunshine days in December: 8.4 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (6.9 days).
Average UV index in December
Rock Stream, NY
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Rock Stream, NY
- Average cloud cover in December: 68
The month with the most cloud cover is February (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Rock Stream, NY
- Average visibility in December: 5mi
The month with the highest visibility is June (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (5mi).
