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 advent of December in McHenry brings a slight shift in average high-temperature, moving from a frosty 46.8°F (8.2°C) in November to a cold 38.3°F (3.5°C). In the month of December, McHenry records a consistent average low-temperature of 26.4°F (-3.1°C).Humidity
The average relative humidity in December is 85%.Rainfall
In McHenry, during December, the rain falls for 8.1 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in McHenry, Maryland, there are 166.5 rainfall days, and 30.79" (782mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 9.1 days. Throughout December, 5.24" (133mm) of snow is accumulated. In McHenry, during the entire year, snow falls for 48.4 days and aggregates up to 26.69" (678mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in McHenry.On the first day of December, sunrise is at 7:19 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:03 pm EST.
Sunshine
The average sunshine in December is 3.6h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 1 in December suggests the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
Is it cold in McHenry during December?
What is the average humidity in December in McHenry?
How many days does it rain in December in McHenry?
How many days does it snow in December in McHenry?
What is the month with the shortest days in McHenry?
What is the average length of the day in December in McHenry?
When are sunrise and sunset in December in McHenry?
How many hours of sunshine does McHenry have in December?
When is the lowest UV index in McHenry?
How high is the UV index in December in McHenry?
Average temperature in December
McHenry, MD
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in December
McHenry, MD
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
McHenry, MD
- Average wind speed in December: 8.4mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
McHenry, MD
- Average humidity in December: 85%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are April, June, July and August (79%).
Average rainfall in December
McHenry, MD
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is November (1.85").
Average rainfall days in December
McHenry, MD
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (20.9 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
McHenry, MD
- Average snowfall in December: 5.24"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
McHenry, MD
- Average snowfall days in December: 9.1 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McHenry, MD
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
McHenry, MD
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (8.3 days).
Average UV index in December
McHenry, MD
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
McHenry, MD
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in December
McHenry, MD
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (5mi).
The month with the lowest visibility is September (4mi).
McHenry, Maryland, USA
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