December weather forecast
Mercer, IA

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Weather in December

December, the first month of the winter in Mercer, is also a wintry month, with an average temperature fluctuating between 34.3°F (1.3°C) and 22.1°F (-5.5°C).

Temperature

The shift from November to December involves a decrease in the average high-temperature, from a chilly 47.5°F (8.6°C) to a cold 34.3°F (1.3°C). In December, Mercer reports a consistent average low-temperature of 22.1°F (-5.5°C) during the nights.

Humidity

The average relative humidity in December is 79%.

Rainfall

In December, the rain falls for 4.7 days. Throughout December, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 115.1 rainfall days, and 19.21" (488mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. In Mercer, during December, snow falls for 5.3 days and regularly aggregates up to 1.22" (31mm) of snow. In Mercer, during the entire year, snow falls for 27.6 days and aggregates up to 8.15" (207mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:24 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:00 pm CST.

Sunshine

The average sunshine in December in Mercer is 4.9h.

UV index

In Mercer, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 2 translates into these guidelines:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Updated: Jun 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

Mercer in December has an average high-temperature of 34.3°F (1.3°C) and an average low-temperature of 22.1°F (-5.5°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 86°F (30°C).

What is the average humidity in December?

In Mercer, the average relative humidity in December is 79%.

How much does it rain in December?

In December, the rain falls for 4.7 days. Throughout December, 0.63" (16mm) of precipitation is accumulated.

How much does it snow in December?

In Mercer, during December, snow falls for 5.3 days and regularly aggregates up to 1.22" (31mm) of snow.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

How many hours of daylight does Mercer have in December?

In Mercer, the average day length in December is 9h and 17min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:24 am and sunset at 4:51 pm. On the last day of the month, in Mercer, sunrise is at 7:43 am and sunset at 5:00 pm CST.

How many hours of sunshine does Mercer have in December?

The average sunshine duration in December is 4.9h.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from 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
Mercer, IA

Average temperature in December - Mercer, IA
  • Average high temperature in December: 34.3°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in December: 22.1°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 (16°F).

Average pressure in December
Mercer, IA

Average pressure in December - Mercer, IA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Mercer, IA

Average wind speed in December - Mercer, IA
  • Average wind speed in December: 9.9mph

The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is July (7mph).

Average humidity in December
Mercer, IA

Average humidity in December - Mercer, IA
  • Average humidity in December: 79%

The months with the highest relative humidity are January and June (81%).
The month with the lowest relative humidity is October (70%).

Average rainfall in December
Mercer, IA

Average rainfall in December - Mercer, IA
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is February (0.51").

Average rainfall days in December
Mercer, IA

Average rainfall days in December - Mercer, IA
  • Average rainfall days in December: 4.7 days

The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (3 days).

Average snowfall in December
Mercer, IA

Average snowfall in December - Mercer, IA
  • Average snowfall in December: 1.22"

The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Mercer, IA

Average snowfall days in December - Mercer, IA
  • Average snowfall days in December: 5.3 days

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Mercer, IA

Average daylight in December / Average sunshine in December - Mercer, IA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in December
Mercer, IA

Average sunshine days in December - Mercer, IA
  • Average sunshine days in December: 21.9 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is May (12 days).

Average UV index in December
Mercer, IA

Average UV index in December - Mercer, IA
  • Average UV index in December: 2

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

Average cloud cover in December
Mercer, IA

Average cloud cover in December - Mercer, IA
  • Average cloud cover in December: 47

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and September (Cloud cover 29).

Average visibility in December
Mercer, IA

Average visibility in December - Mercer, IA
  • Average visibility in December: 6mi

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

Mercer, Iowa, USA

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