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
As Helena enters December, the average high-temperature decreases from the a frosty 47.3°F (8.5°C) of November to a wintry 36.7°F (2.6°C). Helena observes a consistent average low-temperature of 27.9°F (-2.3°C) throughout December nights.Humidity
In December, the average relative humidity is 82%.Rainfall
In December, in Helena, the rain falls for 10.4 days. Throughout December, 1.69" (43mm) of precipitation is accumulated. In Helena, Ohio, during the entire year, the rain falls for 163.4 days and collects up to 30.28" (769mm) of precipitation.Snowfall
Months with snowfall in Helena are January through May, October through December. In Helena, in December, snow falls for 9.9 days, with typically accumulated 2.44" (62mm) of snow. Throughout the year, in Helena, there are 45.1 snowfall days, and 14.02" (356mm) of snow is accumulated.Daylight
December has the shortest days of the year in Helena, with an average of 9h and 12min of daylight.On the first day of December in Helena, Ohio, sunrise is at 7:40 am and sunset at 5:04 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 5:14 pm EST.
Sunshine
The average sunshine in December in Helena is 3.7h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
How cold is December in Helena?
What is the average humidity in December in Helena?
How much does it rain in Helena in December?
How much does it snow in Helena in December?
What is the month with the shortest days in Helena?
What is the average length of the day in December in Helena?
When is the sunrise / sunset in December in Helena?
How many hours of sunshine does Helena have in December?
What is the month with the lowest UV index in Helena?
How high is the UV index in December in Helena?
Average temperature in December
Helena, OH
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in December
Helena, OH
- Average pressure in December: 30.1"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
Helena, OH
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity in December
Helena, OH
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Helena, OH
- Average rainfall in December: 1.69"
The wettest months (with the highest rainfall) are May and June (3.5").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days in December
Helena, OH
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in December
Helena, OH
- Average snowfall in December: 2.44"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Helena, OH
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (12.8 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, OH
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Helena, OH
- Average sunshine days in December: 12.9 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in December
Helena, OH
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Helena, OH
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Helena, OH
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Helena, Ohio, USA
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