December weather forecast
Thayer, IA

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Weather in December

The first month of the winter, December, is also an icy month in Thayer, Iowa, with an average temperature fluctuating between 34.9°F (1.6°C) and 22.8°F (-5.1°C).

Temperature

In Thayer, the beginning of December is marked by a lowered average high-temperature, shifting from November's frosty 47.8°F (8.8°C) to an icy 34.9°F (1.6°C). In Thayer, the expected average low-temperature for December is a subzero cold 22.8°F (-5.1°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

The month with the least rainfall is December, when the rain falls for 4.9 days and typically collects 0.63" (16mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Thayer, in December, snow falls for 6.2 days, with typically accumulated 1.22" (31mm) of snow. Throughout the year, in Thayer, there are 30.8 snowfall days, and 11.77" (299mm) of snow is accumulated.

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 7:22 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:58 pm CST.

Sunshine

In Thayer, the average sunshine in December is 4.7h.

UV index

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
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Frequently asked questions

How cold is December in Thayer?

During December, Thayer experiences an average high-temperature of 34.9°F (1.6°C) and a low-temperature of 22.8°F (-5.1°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, in August is calculated to be 87.8°F (31°C).

What is the average humidity in December in Thayer?

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

What is the driest month in Thayer?

December is the month with the least rainfall in Thayer. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.

How much does it rain in Thayer in December?

In December, in Thayer, the rain falls for 4.9 days. Throughout December, 0.63" (16mm) of precipitation is accumulated.

How many days does it snow in December in Thayer?

In Thayer, Iowa, during December, snow falls for 6.2 days and regularly aggregates up to 1.22" (31mm) of snow.

What is the month with the shortest days in Thayer?

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

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

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

What time are sunrise and sunset in December in Thayer?

On the first day of December in Thayer, sunrise is at 7:22 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:58 pm CST.

How long on average sun shines in December in Thayer?

The average sunshine duration in December in Thayer, Iowa, is 4.7h.

What is the UV index intensity in December in Thayer?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Thayer, IA

Average temperature in December - Thayer, IA
  • Average high temperature in December: 34.9°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 (29.1°F).

  • Average low temperature in December: 22.8°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).

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Average pressure in December
Thayer, IA

Average pressure in December - Thayer, IA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in December
Thayer, IA

Average wind speed in December - Thayer, IA
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in December
Thayer, IA

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

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in December
Thayer, IA

Average rainfall in December - Thayer, 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 December (0.63").

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Average rainfall days in December
Thayer, IA

Average rainfall days in December - Thayer, IA
  • Average rainfall days in December: 4.9 days

The months with the highest number of rainy days are May and June (16.4 days).
The months with the least rainy days are January and February (3.7 days).

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Average snowfall in December
Thayer, IA

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

The month with the highest snowfall is January (3.66").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Thayer, IA

Average snowfall days in December - Thayer, IA
  • Average snowfall days in December: 6.2 days

The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Thayer, 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 4min

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 18min).

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Average sunshine days in December
Thayer, IA

Average sunshine days in December - Thayer, IA
  • Average sunshine days in December: 21 days

The month with the most sunshine days is December (21 days).
The months with the least sunshine days are May and June (11.3 days).

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Average UV index in December
Thayer, IA

Average UV index in December - Thayer, 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).

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Average cloud cover in December
Thayer, IA

Average cloud cover in December - Thayer, IA
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in December
Thayer, IA

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

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

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Thayer, Iowa, USA

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