December weather forecast
Seymour, IA

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Weather in December

The first month of the winter, December, is also an icy month in Seymour, Iowa, with an average temperature ranging between min 23.5°F (-4.7°C) and max 35.6°F (2°C).

Temperature

The beginning of December involves a decrease in the average high-temperature, transitioning from a chilly 48.4°F (9.1°C) in November to a wintry 35.6°F (2°C). Seymour anticipates an average minimum temperature of 23.5°F (-4.7°C) in the month of December.

Humidity

The average relative humidity in December is 79%.

Rainfall

January and December are months with the least rain when the rain falls for 5.5 days and typically aggregates up to 0.71" (18mm) of rain.

Snowfall

January through May, October through December are months with snowfall in Seymour. In December, it is snowing for 5.7 days. Throughout December, 0.98" (25mm) of snow is accumulated. In Seymour, during the entire year, snow falls for 28.4 days and aggregates up to 11.34" (288mm) 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 7:17 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:55 pm CST.

Sunshine

The average sunshine in December is 4.8h.

UV index

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the UV index of 2 transforms into the following advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In Seymour, 35.6°F (2°C) is the average high-temperature and 23.5°F (-4.7°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is appraised at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

What is the driest month?

January and December are months with the least rain when the rain falls for 5.5 days and typically aggregates up to 0.71" (18mm) of rain.

How many days does it rain in December?

In December, in Seymour, the rain falls for 5.5 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

How much does it snow in December?

In Seymour, in December, during 5.7 snowfall days, 0.98" (25mm) of snow is typically accumulated.

What is the month with the shortest days?

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

How many hours of daylight does Seymour have in December?

In December, the average day length is 9h and 19min.

When is the sunrise / sunset in December in Seymour?

In December, on the first day of the month, sunrise is at 7:17 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:55 pm CST.

How many hours of sunshine does Seymour have in December?

In December, the average sunshine duration is 4.8h.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Seymour, IA

Average temperature in December - Seymour, IA
  • Average high temperature in December: 35.6°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 (30°F).

  • Average low temperature in December: 23.5°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

Average pressure in December
Seymour, IA

Average pressure in December - Seymour, 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).

Average wind speed in December
Seymour, IA

Average wind speed in December - Seymour, IA
  • Average wind speed in December: 10mph

The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

Average humidity in December
Seymour, IA

Average humidity in December - Seymour, 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 (72%).

Average rainfall in December
Seymour, IA

Average rainfall in December - Seymour, IA
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").

Average rainfall days in December
Seymour, IA

Average rainfall days in December - Seymour, IA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Seymour, IA

Average snowfall in December - Seymour, IA
  • Average snowfall in December: 0.98"

The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Seymour, IA

Average snowfall days in December - Seymour, IA
  • Average snowfall days in December: 5.7 days

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 0min).
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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in December
Seymour, IA

Average sunshine days in December - Seymour, IA
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).

Average UV index in December
Seymour, IA

Average UV index in December - Seymour, 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
Seymour, IA

Average cloud cover in December - Seymour, IA
  • Average cloud cover in December: 48

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

Average visibility in December
Seymour, IA

Average visibility in December - Seymour, 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).

Seymour, Iowa, USA

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