December weather forecast
Center Grove, IA

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Weather in December

The first month of the winter, December, is still a freezing cold month in Center Grove, Iowa, with temperature in the range of an average low of 21°F (-6.1°C) and an average high of 31.5°F (-0.3°C).

Temperature

The start of December involves a temperature drop, moving from a chilly 43.9°F (6.6°C) in November to a freezing cold 31.5°F (-0.3°C). Center Grove's average low-temperature is measured at a still subzero cold 21°F (-6.1°C) during December.

Humidity

In December, the average relative humidity is 82%.

Rainfall

In Center Grove, in December, it is raining for 6.3 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Center Grove, there are 135.3 rainfall days, and 27.4" (696mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Center Grove. In Center Grove, in December, during 9 snowfall days, 2.68" (68mm) of snow is typically accumulated. Throughout the year, there are 43.9 snowfall days, and 17.09" (434mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 7:13 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:40 pm CST.

Sunshine

In Center Grove, the average sunshine in December is 4h.

UV index

January, November 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 unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 31.5°F (-0.3°C) and a low-temperature of 21°F (-6.1°C).

What is the average humidity in December?

In Center Grove, the average relative humidity in December is 82%.

How much does it rain in December?

In Center Grove, Iowa, in December, it is raining for 6.3 days, with typically 1.38" (35mm) of accumulated precipitation.

How much does it snow in December?

In Center Grove, in December, snow falls for 9 days, with typically accumulated 2.68" (68mm) of snow.

What is the month with the shortest days?

With an average of 9h and 6min of daylight, December has the shortest days of the year.

How many hours of daylight does Center Grove have in December?

The average day length in December is 9h and 8min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:13 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:40 pm CST.

How many hours of sunshine does Center Grove have in December?

The average sunshine duration in December in Center Grove is 4h.

When is the lowest UV index?

The months with the lowest UV index are January, November and December, with an average maximum UV index of 1.

What is the UV index reading in December?

In Center Grove, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
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
Center Grove, IA

Average temperature in December - Center Grove, IA
  • Average high temperature in December: 31.5°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 (25°F).

  • Average low temperature in December: 21°F

The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

Average pressure in December
Center Grove, IA

Average pressure in December - Center Grove, IA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in December
Center Grove, IA

Average wind speed in December - Center Grove, IA
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity in December
Center Grove, IA

Average humidity in December - Center Grove, IA
  • Average humidity in December: 82%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).

Average rainfall in December
Center Grove, IA

Average rainfall in December - Center Grove, IA
  • Average rainfall in December: 1.38"

The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").

Average rainfall days in December
Center Grove, IA

Average rainfall days in December - Center Grove, IA
  • Average rainfall days in December: 6.3 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).

Average snowfall in December
Center Grove, IA

Average snowfall in December - Center Grove, IA
  • Average snowfall in December: 2.68"

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Center Grove, IA

Average snowfall days in December - Center Grove, IA
  • Average snowfall days in December: 9 days

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Center Grove, IA

Average daylight in December / Average sunshine in December - Center Grove, IA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 4h and 0min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in December
Center Grove, IA

Average sunshine days in December - Center Grove, IA
  • Average sunshine days in December: 17.5 days

The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in December
Center Grove, IA

Average UV index in December - Center Grove, IA
  • Average UV index in December: 1

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

Average cloud cover in December
Center Grove, IA

Average cloud cover in December - Center Grove, IA
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in December
Center Grove, IA

Average visibility in December - Center Grove, IA
  • Average visibility in December: 6mi

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

Center Grove, Iowa, USA

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