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 December arrives, Hartley's weather displays a decrease in high-temperatures, transitioning from November's wintry 36.5°F (2.5°C) to a subzero cold 24.8°F (-4°C). During December, the nighttime temperatures align closely with the daytime averages, measuring a still freezing cold 16.5°F (-8.6°C).Humidity
The average relative humidity in December is 89%.Rainfall
In December, the rain falls for 3.2 days. Throughout December, 1.61" (41mm) of precipitation is accumulated. In Hartley, during the entire year, the rain falls for 112.5 days and collects up to 22.68" (576mm) of precipitation.Snowfall
Months with snowfall in Hartley are January through May, October through December. The month with the most snowfall is December, when snow falls for 21.5 days and typically aggregates up to 10.63" (270mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:14 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:22 pm CST.
Sunshine
The average sunshine in December is 1.7h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 1 transforms into these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. During bright days, sunglasses that offer UVA and UVB defense are recommended. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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 in Hartley?
How much does it rain in December?
When does it snow the most?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Hartley have in December?
When is the sunrise / sunset in December in Hartley?
How many hours of sunshine does Hartley have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Hartley, MI
- Average high temperature in December: 24.8°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (19.2°F).
- Average low temperature in December: 16.5°F
The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in December
Hartley, MI
- Average pressure in December: 30.06"Hg
The months with the highest atmospheric pressure are February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Hartley, MI
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are June, July and August (7.1mph).
Average humidity in December
Hartley, MI
- Average humidity in December: 89%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (71%).
Average rainfall in December
Hartley, MI
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days in December
Hartley, MI
- Average rainfall days in December: 3.2 days
The month with the highest number of rainy days is August (14.4 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in December
Hartley, MI
- Average snowfall in December: 10.63"
The month with the highest snowfall is December (10.63").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Hartley, MI
- Average snowfall days in December: 21.5 days
The month with the highest number of snowfall days is January (23.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Hartley, MI
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 1h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 1h and 30min).
Average sunshine days in December
Hartley, MI
- Average sunshine days in December: 8.5 days
The month with the most sunshine days is July (15.5 days).
The month with the least sunshine days is January (7.4 days).
Average UV index in December
Hartley, MI
- 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, February, March, November and December (UV index 1).
Average cloud cover in December
Hartley, MI
- Average cloud cover in December: 82
The month with the most cloud cover is January (Cloud cover 85).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Hartley, MI
- Average visibility in December: 5mi
The months with the highest visibility are May, June, July, September and October (6mi).
The months with the lowest visibility are January and February (4mi).
Hartley, Michigan, USA
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