December weather forecast
Clear Lake, IA

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Weather in December

The first month of the winter, December, is still a freezing cold month in Clear Lake, Iowa, with an average temperature varying between 17.8°F (-7.9°C) and 28.2°F (-2.1°C).

Temperature

The shift from November to December brings a noticeable decrease in the average high-temperature, dropping from a wintry 42.6°F (5.9°C) to a freezing cold 28.2°F (-2.1°C). During the month of December, an average low-temperature of 17.8°F (-7.9°C) is recorded.

Humidity

In Clear Lake, the average relative humidity in December is 86%.

Rainfall

In December, the rain falls for 5.8 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. Throughout the year, there are 145.9 rainfall days, and 28.82" (732mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Clear Lake, in December, snow falls for 13.3 days, with typically accumulated 4.17" (106mm) of snow. Throughout the year, there are 60.2 snowfall days, and 26.26" (667mm) 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 7:26 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 4:48 pm CST.

Sunshine

In Clear Lake, the average sunshine in December is 4.1h.

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 vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Boost your sun resistance with garments that are densely woven yet spacious. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The high-temperature, in December, in Clear Lake, is 28.2°F (-2.1°C), while the low-temperature averages to 17.8°F (-7.9°C).

What is the average humidity in December?

In Clear Lake, the average relative humidity in December is 86%.

How much does it rain in December?

In December, in Clear Lake, the rain falls for 5.8 days. Throughout December, 1.57" (40mm) of precipitation is accumulated.

How much does it snow in December?

In Clear Lake, Iowa, in December, snow falls for 13.3 days, with typically accumulated 4.17" (106mm) of snow.

What is the month with the shortest days in Clear Lake?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

How many hours of daylight does Clear Lake have in December?

The average day length in December is 9h and 3min.

When are sunrise and sunset in December?

On the first day of December in Clear Lake, sunrise is at 7:26 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 4:48 pm CST.

How long on average sun shines in December?

The average sunshine duration in December in Clear Lake is 4.1h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a low health threat from exposure to the Sun's 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
Clear Lake, IA

Average temperature in December - Clear Lake, IA
  • Average high temperature in December: 28.2°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.3°F).

  • Average low temperature in December: 17.8°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).

Average pressure in December
Clear Lake, IA

Average pressure in December - Clear Lake, IA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Clear Lake, IA

Average wind speed in December - Clear Lake, IA
  • Average wind speed in December: 10.4mph

The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.3mph).

Average humidity in December
Clear Lake, IA

Average humidity in December - Clear Lake, IA
  • Average humidity in December: 86%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Clear Lake, IA

Average rainfall in December - Clear Lake, IA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is June (4.65").
The driest month (with the least rainfall) is January (1.06").

Average rainfall days in December
Clear Lake, IA

Average rainfall days in December - Clear Lake, IA
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is June (19.8 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in December
Clear Lake, IA

Average snowfall in December - Clear Lake, IA
  • Average snowfall in December: 4.17"

The month with the highest snowfall is February (7.48").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Clear Lake, IA

Average snowfall days in December - Clear Lake, IA
  • Average snowfall days in December: 13.3 days

The month with the highest number of snowfall days is January (14.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Clear Lake, IA

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

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 6min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in December
Clear Lake, IA

Average sunshine days in December - Clear Lake, IA
  • Average sunshine days in December: 14.5 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (8 days).

Average UV index in December
Clear Lake, IA

Average UV index in December - Clear Lake, 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 and December (UV index 1).

Average cloud cover in December
Clear Lake, IA

Average cloud cover in December - Clear Lake, 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
Clear Lake, IA

Average visibility in December - Clear Lake, IA
  • Average visibility in December: 5mi

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

Clear Lake, Iowa, USA

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