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 involves a decrease in temperature, down from a fresh 54°F (12.2°C) in November to a frosty 43.5°F (6.4°C). In Herculaneum, an average temperature of 30.7°F (-0.7°C) is noted during December nights.Humidity
The average relative humidity in December is 76%.Rainfall
In Herculaneum, in December, during 8.6 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. In Herculaneum, during the entire year, the rain falls for 155 days and collects up to 34.92" (887mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Herculaneum, in December, during 3.9 snowfall days, 2.05" (52mm) of snow is typically accumulated. In Herculaneum, Missouri, during the entire year, snow falls for 19.9 days and aggregates up to 8.43" (214mm) of snow.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:00 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:51 pm CST.
Sunshine
In December, the average sunshine is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December in Herculaneum?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Herculaneum have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Herculaneum, MO
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 30.7°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in December
Herculaneum, MO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Herculaneum, MO
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is January (9mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Herculaneum, MO
- Average humidity in December: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Herculaneum, MO
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days in December
Herculaneum, MO
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in December
Herculaneum, MO
- Average snowfall in December: 2.05"
The month with the highest snowfall is January (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Herculaneum, MO
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Herculaneum, MO
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Herculaneum, MO
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is December (19.2 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in December
Herculaneum, MO
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Herculaneum, MO
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are June, July and August (Cloud cover 28).
Average visibility in December
Herculaneum, MO
- 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).
Herculaneum, Missouri, USA
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