Grand Rapids
Michigan, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Grand Rapids, MI

The vast cityscape of Grand Rapids, a moderately large town in Michigan, and two visible bridges across the river, on a warm and cool, cloudy day
The vast cityscape of Grand Rapids, a moderately large town in Michigan, and two visible bridges across the river, on a warm and cool, cloudy day
December, the first month of the winter, in Grand Rapids, is still a cold month, with average temperature ranging between max 33.8°F (1°C) and min 26.2°F (-3.2°C).

Temperature

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

Humidity

The average relative humidity in Grand Rapids is 84%.

Rainfall

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

Snowfall

Months with snowfall are January through April, November and December. In Grand Rapids, in December, during 8.5 snowfall days, 0.87" (22mm) of snow is typically accumulated. In Grand Rapids, during the entire year, snow falls for 44.5 days, and aggregates up to 5.51" (140mm) of snow.

Daylight

With an average of 9.1h of daylight, December has the shortest days of the year.

Sunshine

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

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 1 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

What is the temperature in December in Grand Rapids?

In December, in Grand Rapids, Michigan, the average high-temperature is 33.8°F (1°C), and the average low-temperature is 26.2°F (-3.2°C).

What is the average humidity in December in Grand Rapids?

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

How much does it rain in Grand Rapids in December?

In December, 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, snow falls for 8.5 days, with typically accumulated 0.87" (22mm) of snow.

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

December has the shortest days of the year in Grand Rapids, Michigan, with an average of 9.1h of daylight.

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

In Grand Rapids, Michigan, the average length of the day in December is 9.1h.

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

The average sunshine in December in Grand Rapids, Michigan, is 2.9h.

What are the months with the lowest UV index in Grand Rapids?

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

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

In Grand Rapids, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to the UV radiation.
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).

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%).

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 lowest rainfall) is March (0.47").

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 lowest number of rainy days is February (3.8 days).

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

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

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).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Grand Rapids, MI
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 2.9h

The month with most sunshine is July (Average sunshine: 10.3h).
The month with least sunshine is January (Average sunshine: 2.3h).

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

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