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
December ushers in a minute temperature change, with average high-temperatures reducing from November's cool 52.5°F (11.4°C) to a frosty 44.4°F (6.9°C). In Riverhead, December nights maintain a consistent temperature, with an average low of 37°F (2.8°C).Humidity
In Riverhead, the average relative humidity in December is 74%.Rainfall
The month with the most rainfall in Riverhead, New York, is December, when the rain falls for 13.1 days and typically aggregates up to 3.27" (83mm) of precipitation.Snowfall
January through March, May, November and December are months with snowfall in Riverhead. In December, it is snowing for 2.9 days. Throughout December, 0.59" (15mm) of snow is accumulated. In Riverhead, during the entire year, snow falls for 18.6 days and aggregates up to 4.45" (113mm) of snow.Daylight
The month with the shortest days in Riverhead is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:56 am and sunset at 4:23 pm. On the last day of December, in Riverhead, sunrise is at 7:15 am and sunset at 4:32 pm EST.
Sunshine
In December, the average sunshine in Riverhead is 4.8h.UV index
January through March 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 low health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
How cold is December in Riverhead?
What is the average humidity in December in Riverhead?
What is the wettest month in Riverhead?
How many days does it rain in December in Riverhead?
How many days does it snow in December in Riverhead?
What is the month with the shortest days in Riverhead?
What is the average length of the day in December in Riverhead?
When is the sunrise / sunset in December in Riverhead?
How many hours of sunshine does Riverhead have in December?
What are the months with the lowest UV index in Riverhead?
What is the UV index reading in December in Riverhead?
Average temperature in December
Riverhead, NY
- Average high temperature in December: 44.4°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in December: 37°F
The month with the highest average low temperature is August (71.2°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in December
Riverhead, 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 (29.93"Hg).
Average wind speed in December
Riverhead, NY
- Average wind speed in December: 14.2mph
The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).
Average humidity in December
Riverhead, NY
- Average humidity in December: 74%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Riverhead, NY
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is December (3.27").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Riverhead, NY
- Average rainfall days in December: 13.1 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (9 days).
Average snowfall in December
Riverhead, NY
- Average snowfall in December: 0.59"
The month with the highest snowfall is March (1.54").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in December
Riverhead, NY
- Average snowfall days in December: 2.9 days
The month with the highest number of snowfall days is January (5.5 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
Riverhead, NY
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Riverhead, NY
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is February (13.2 days).
Average UV index in December
Riverhead, NY
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in December
Riverhead, NY
- Average cloud cover in December: 49
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Riverhead, NY
- 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).
Riverhead, New York, USA
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