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's arrival correlates with a reduction in the average high-temperature, down from a cold 42.4°F (5.8°C) in November to a still wintry 32.9°F (0.5°C). Throughout December, Portlandville's nights cool down to an average of 22.5°F (-5.3°C).Humidity
January, February and December, with an average relative humidity of 87%, are the most humid months.Rainfall
In Portlandville, in December, it is raining for 10.3 days, with typically 2.4" (61mm) of accumulated precipitation. In Portlandville, during the entire year, the rain falls for 161.4 days and collects up to 31.26" (794mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Portlandville, during December, snow falls for 16.7 days and regularly aggregates up to 8.39" (213mm) of snow. In Portlandville, during the entire year, snow falls for 92.9 days and aggregates up to 48.27" (1226mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Portlandville.On the first day of December, sunrise is at 7:10 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:36 pm EST.
Sunshine
The average sunshine in December is 2.7h.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 1 during December translates into these guidelines:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Portlandville in December?
What are the most humid months in Portlandville?
What is the average humidity in December in Portlandville?
How many days does it rain in December in Portlandville?
How much does it snow in Portlandville in December?
What is the month with the shortest days in Portlandville?
What is the average length of the day in December in Portlandville?
What time are sunrise and sunset in December in Portlandville?
How long on average sun shines in December in Portlandville?
When is the lowest UV index in Portlandville?
What is the UV index intensity in December in Portlandville?
Average temperature in December
Portlandville, NY
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 22.5°F
The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Portlandville, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Portlandville, NY
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Portlandville, NY
- Average humidity in December: 87%
The months with the highest relative humidity are January, February and December (87%).
The months with the lowest relative humidity are April and May (79%).
Average rainfall in December
Portlandville, NY
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Portlandville, NY
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (6.6 days).
Average snowfall in December
Portlandville, NY
- Average snowfall in December: 8.39"
The month with the highest snowfall is February (9.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Portlandville, NY
- Average snowfall days in December: 16.7 days
The month with the highest number of snowfall days is January (20.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Portlandville, NY
- Average daylight in December: 9h and 1min
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: 2h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 2h and 36min).
Average sunshine days in December
Portlandville, NY
- Average sunshine days in December: 7.9 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (5.5 days).
Average UV index in December
Portlandville, 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, February, March, November and December (UV index 1).
Average cloud cover in December
Portlandville, NY
- Average cloud cover in December: 73
The month with the most cloud cover is February (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 41).
Average visibility in December
Portlandville, NY
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).
Portlandville, New York, USA
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