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
The shift from November to December involves a decrease in the average high-temperature, dropping from a cold 42.1°F (5.6°C) to a freezing cold 29.7°F (-1.3°C). Throughout December, the temperature tends to fall to a consistent average low of 19.4°F (-7°C).Humidity
In Helena, the average relative humidity in December is 86%.Rainfall
In December, the rain falls for 10.2 days. Throughout December, 2.32" (59mm) of precipitation is accumulated. Throughout the year, in Helena, New York, there are 160.1 rainfall days, and 29.76" (756mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Helena, in December, snow falls for 13.1 days, with typically accumulated 5.98" (152mm) of snow. In Helena, during the entire year, snow falls for 70.6 days and aggregates up to 36.02" (915mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:17 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:27 pm EST.
Sunshine
In December, the average sunshine is 3.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 1 suggests these recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Helena have in December?
When are sunrise and sunset in December?
How long on average sun shines in December in Helena?
When is the lowest UV index in Helena?
What is the UV index intensity in December?
Average temperature in December
Helena, NY
- Average high temperature in December: 29.7°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 (23°F).
- Average low temperature in December: 19.4°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in December
Helena, NY
- Average pressure in December: 30.04"Hg
The months with the highest atmospheric pressure are March and November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Helena, NY
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is February (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in December
Helena, NY
- Average humidity in December: 86%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
Helena, NY
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Helena, NY
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in December
Helena, NY
- Average snowfall in December: 5.98"
The month with the highest snowfall is January (9.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Helena, NY
- Average snowfall days in December: 13.1 days
The month with the highest number of snowfall days is February (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Helena, NY
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 2h and 42min).
Average sunshine days in December
Helena, NY
- Average sunshine days in December: 11.6 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is July (9.1 days).
Average UV index in December
Helena, NY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Helena, NY
- Average cloud cover in December: 68
The month with the most cloud cover is February (Cloud cover 73).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Helena, NY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Helena, New York, USA
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