December weather forecast
Grand Rapids, MI

The vast cityscape of Grand Rapids, a moderately large town in Michigan and two visible bridges across the river
The vast cityscape of Grand Rapids, a moderately large town in Michigan and two visible bridges across the river

Weather in December

The first month of the winter, December, is still a cold month in Grand Rapids, Michigan, with an average temperature varying between 26.2°F (-3.2°C) and 33.8°F (1°C).

Temperature

In December, the average high-temperature drops from a frosty 45°F (7.2°C) in November to a cold 33.8°F (1°C). The average low-temperature, in December, is 26.2°F (-3.2°C).

Humidity

In December, the average relative humidity in Grand Rapids, Michigan, is 84%.

Rainfall

In Grand Rapids, during 5.6 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Grand Rapids, during the entire year, the rain falls for 103.5 days and collects up to 9.02" (229mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In December, in Grand Rapids, it is snowing for 8.5 days. Throughout December, 0.87" (22mm) of snow is accumulated. Throughout the year, there are 44.5 snowfall days, and 5.51" (140mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Grand Rapids, with an average of 9h and 4min of daylight.
On the first day of the month, sunrise is at 7:54 am and sunset at 5:09 pm. On the last day of December, in Grand Rapids, Michigan, sunrise is at 8:13 am and sunset at 5:17 pm EST.

Sunshine

In Grand Rapids, the average sunshine in December is 2.9h.

UV index

The months with the lowest UV index in Grand Rapids are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Grand Rapids?

In December, the average relative humidity is 84%.

How much does it rain in Grand Rapids in December?

In December, in Grand Rapids, Michigan, the rain falls for 5.6 days. Throughout December, 0.55" (14mm) of precipitation is accumulated.

How many days does it snow in December in Grand Rapids?

In Grand Rapids, in December, during 8.5 snowfall days, 0.87" (22mm) of snow is typically accumulated.

What is the month with the shortest days in Grand Rapids?

With an average of 9h and 4min of daylight, December has the shortest days of the year in Grand Rapids, Michigan.

What is the average length of the day in December in Grand Rapids?

The average day length in December is 9h and 4min.

When are sunrise and sunset in December in Grand Rapids?

On the first day of December in Grand Rapids, sunrise is at 7:54 am and sunset at 5:09 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 5:17 pm EST.

How many hours of sunshine does Grand Rapids have in December?

In December, the average sunshine duration is 2.9h.

When is the lowest UV index in Grand Rapids?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Grand Rapids, Michigan.

What is the UV index reading in December in Grand Rapids?

In December, the average daily maximum UV index in Grand Rapids, Michigan, is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Grand Rapids, MI

Average temperature in December - Grand Rapids, MI
  • Average high temperature in December: 33.8°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (27.7°F).

  • Average low temperature in December: 26.2°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

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Average pressure in December
Grand Rapids, MI

Average pressure in December - Grand Rapids, MI
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Grand Rapids, MI

Average wind speed in December - Grand Rapids, MI
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in December
Grand Rapids, MI

Average humidity in December - Grand Rapids, MI
  • Average humidity in December: 84%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in December
Grand Rapids, MI

Average rainfall in December - Grand Rapids, MI
  • Average rainfall in December: 0.55"

The wettest month (with the highest rainfall) is May (1.14").
The driest month (with the least rainfall) is March (0.47").

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Average rainfall days in December
Grand Rapids, MI

Average rainfall days in December - Grand Rapids, MI
  • Average rainfall days in December: 5.6 days

The month with the highest number of rainy days is May (13 days).
The month with the least rainy days is February (3.8 days).

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Average snowfall in December
Grand Rapids, MI

Average snowfall in December - Grand Rapids, MI
  • Average snowfall in December: 0.87"

The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Grand Rapids, MI

Average snowfall days in December - Grand Rapids, MI
  • Average snowfall days in December: 8.5 days

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Grand Rapids, MI

Average daylight in December / Average sunshine in December - Grand Rapids, MI
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 4min).

  • Average sunshine in December: 2h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in December
Grand Rapids, MI

Average sunshine days in December - Grand Rapids, MI
  • Average sunshine days in December: 19.4 days

The month with the most sunshine days is September (21 days).
The month with the least sunshine days is April (13.4 days).

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Average UV index in December
Grand Rapids, MI

Average UV index in December - Grand Rapids, MI
  • Average UV index in December: 1

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in December
Grand Rapids, MI

Average cloud cover in December - Grand Rapids, MI
  • Average cloud cover in December: 70

The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in December
Grand Rapids, MI

Average visibility in December - Grand Rapids, MI
  • Average visibility in December: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

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