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 ushers in a slight temperature change, with average high-temperatures reducing from November's icy 40.5°F (4.7°C) to a freezing cold 29.7°F (-1.3°C). The temperature during December nights demonstrates a small drop from the daytime highs, settling to an average of 21.6°F (-5.8°C).Humidity
The average relative humidity in December is 87%.Rainfall
In Johannesburg, in December, it is raining for 8.5 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, there are 140.1 rainfall days, and 23.39" (594mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Johannesburg, during December, snow falls for 21.5 days and regularly aggregates up to 8.19" (208mm) of snow. Throughout the year, there are 109.2 snowfall days, and 47.09" (1196mm) of snow is accumulated.Daylight
The month with the shortest days in Johannesburg is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:56 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 8:15 am and sunset at 5:06 pm EST.
Sunshine
The average sunshine in December is 2.1h.UV index
January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 1 during December translates into the following directions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Johannesburg?
What is the average humidity in December?
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 Johannesburg have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Johannesburg, MI
- Average high temperature in December: 29.7°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in December: 21.6°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in December
Johannesburg, MI
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is March (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Johannesburg, MI
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Johannesburg, MI
- Average humidity in December: 87%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).
Average rainfall in December
Johannesburg, MI
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in December
Johannesburg, MI
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is October (17.5 days).
The months with the least rainy days are January and February (5 days).
Average snowfall in December
Johannesburg, MI
- Average snowfall in December: 8.19"
The month with the highest snowfall is January (10.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Johannesburg, MI
- Average snowfall days in December: 21.5 days
The month with the highest number of snowfall days is January (24.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Johannesburg, MI
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 2h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 1h and 42min).
Average sunshine days in December
Johannesburg, MI
- Average sunshine days in December: 6.8 days
The month with the most sunshine days is September (14.6 days).
The month with the least sunshine days is February (5.4 days).
Average UV index in December
Johannesburg, MI
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in December
Johannesburg, MI
- Average cloud cover in December: 78
The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Johannesburg, MI
- Average visibility in December: 4mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Johannesburg, Michigan, USA
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