Detroit
Michigan, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Detroit, MI

The downtown city of Detroit, Michigan, viewed from a bird
The downtown city of Detroit, Michigan, viewed from a bird's eye angle
December, the first month of the winter, in Detroit, is still a cold month, with average temperature varying between 35.2°F (1.8°C) and 27.5°F (-2.5°C).

Temperature

In Detroit, Michigan, the average high-temperature decreases, from a chilly 45.7°F (7.6°C) in November, to a wintry 35.2°F (1.8°C). The average low-temperature, in December, is 27.5°F (-2.5°C).

Humidity

The average relative humidity in Detroit, Michigan, is 81%.

Rainfall

In Detroit, Michigan, during 8.5 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, in Detroit, Michigan, there are 152.1 rainfall days, and 23.43" (595mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Detroit, during December, snow falls for 12.4 days and regularly aggregates up to 2.28" (58mm) of snow. Throughout the year, there are 54.3 snowfall days, and 14.84" (377mm) of snow is accumulated.

Ocean temperature

In Detroit, the average water temperature is 38.1°F (3.4°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

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

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 reading of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 1 interpret into the following advice:
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. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Detroit?

The average high-temperature, in December, in Detroit, Michigan, is 35.2°F (1.8°C), while the average low-temperature is 27.5°F (-2.5°C).

What is the average humidity in December in Detroit?

In Detroit, the average relative humidity in December is 81%.

How many days does it rain in December in Detroit?

In December, in Detroit, the rain falls for 8.5 days. Throughout December, 1.26" (32mm) of precipitation is accumulated.

How much does it snow in Detroit in December?

In Detroit, in December, snow falls for 12.4 days, with typically accumulated 2.28" (58mm) of snow.

What is the water temperature in December in Detroit?

In Detroit, in December, the average water temperature is 38.1°F (3.4°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the month with the shortest days in Detroit?

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

What is the average length of the day in December in Detroit?

The average length of the day in December in Detroit is 9.1h.

How long on average sun shines in December in Detroit?

The average sunshine in December in Detroit is 3.6h.

When is the lowest UV index in Detroit?

December is the month with the lowest UV index in Detroit, Michigan, with an average maximum UV index of 1.

What is the UV index reading in December in Detroit?

In December, the average daily maximum UV index in Detroit, Michigan, is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Detroit, MI
  • Average high temperature in December: 35.2°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 (29.3°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average humidity in December - Detroit, MI
  • Average humidity in December: 81%

The month with the highest relative humidity is February (85%).
Months with the lowest relative humidity are July and August (73%).

Average rainfall in December - Detroit, MI
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the lowest rainfall) is February (1.22").

Average rainfall days in December - Detroit, MI
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is May (16.8 days).
The month with the lowest number of rainy days is January (7.1 days).

Average snowfall in December - Detroit, MI
  • Average snowfall in December: 2.28"

The month with the highest snowfall is January (4.29").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in December - Detroit, MI
  • Average snowfall days in December: 12.4 days

The month with the highest number of snowfall days is January (14.5 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature in December - Detroit, MI
  • Average sea temperature in December: 38.2°F

The best month for swimming (with the highest average sea temperature) is August (75.4°F).
The coldest month (with the lowest average sea temperature) is February (32.7°F).

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

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 3.6h

The month with most sunshine is July (Average sunshine: 10.6h).
The month with least sunshine is January (Average sunshine: 3.2h).

Average UV index in December - Detroit, MI
  • Average UV index in December: 1

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