December weather forecast
Diagonal, IA

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Weather in December

December, the first month of the winter in Diagonal, is also a wintry month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 35.2°F (1.8°C).

Temperature

The arrival of December indicates a decrease in the average high-temperature, moving from a chilly 48.4°F (9.1°C) in November to a wintry 35.2°F (1.8°C). In Diagonal, in December, the average low-temperature is a freezing cold 23.2°F (-4.9°C).

Humidity

In December, the average relative humidity is 78%.

Rainfall

The months with the least rainfall in Diagonal are February and December Rain falls for 5.4 days and accumulates 0.71" (18mm) of rain.

Snowfall

Months with snowfall in Diagonal are January through May, October through December. In Diagonal, during December, snow falls for 5.8 days and regularly aggregates up to 1.42" (36mm) of snow. Throughout the year, there are 28.7 snowfall days, and 11.85" (301mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:41 am and sunset at 4:59 pm CST.

Sunshine

In December, the average sunshine is 5h.

UV index

In Diagonal, Iowa, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Frequently asked questions

How cold is December in Diagonal?

In December, the average high-temperature and low-temperature in Diagonal, Iowa, are 35.2°F (1.8°C) and 23.2°F (-4.9°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 87.8°F (31°C).

What is the average humidity in December in Diagonal?

In Diagonal, the average relative humidity in December is 78%.

What is the driest month in Diagonal?

The months with the least rainfall are February and December Rain falls for 5.4 days and accumulates 0.71" (18mm) of rain.

How many days does it rain in December in Diagonal?

In Diagonal, Iowa, in December, during 5.4 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

How many days does it snow in December in Diagonal?

In Diagonal, during December, snow falls for 5.8 days and regularly aggregates up to 1.42" (36mm) of snow.

What is the month with the shortest days in Diagonal?

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

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

The average day length in December is 9h and 18min.

When is the sunrise / sunset in December in Diagonal?

On the first day of December in Diagonal, sunrise is at 7:22 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:59 pm CST.

How many hours of sunshine does Diagonal have in December?

In December, the average sunshine duration in Diagonal, Iowa, is 5h.

What is the UV index reading in December in Diagonal?

In Diagonal, Iowa, the average daily maximum UV index in December is 2. 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
Diagonal, IA

Average temperature in December - Diagonal, IA
  • Average high temperature in December: 35.2°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 23.2°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

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Average pressure in December
Diagonal, IA

Average pressure in December - Diagonal, 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).

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Average wind speed in December
Diagonal, IA

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

The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in December
Diagonal, IA

Average humidity in December - Diagonal, IA
  • Average humidity in December: 78%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in December
Diagonal, IA

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

The wettest month (with the highest rainfall) is June (3.86").
The driest months (with the least rainfall) are February and December (0.71").

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Average rainfall days in December
Diagonal, IA

Average rainfall days in December - Diagonal, IA
  • Average rainfall days in December: 5.4 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (4.1 days).

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Average snowfall in December
Diagonal, IA

Average snowfall in December - Diagonal, IA
  • Average snowfall in December: 1.42"

The month with the highest snowfall is January (3.54").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Diagonal, IA

Average snowfall days in December - Diagonal, IA
  • Average snowfall days in December: 5.8 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).

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

Average daylight in December / Average sunshine in December - Diagonal, 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: 5h and 0min

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 36min).

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Average sunshine days in December
Diagonal, IA

Average sunshine days in December - Diagonal, IA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is May (10.6 days).

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Average UV index in December
Diagonal, IA

Average UV index in December - Diagonal, 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
Diagonal, IA

Average cloud cover in December - Diagonal, IA
  • Average cloud cover in December: 46

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in December
Diagonal, IA

Average visibility in December - Diagonal, 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).

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Diagonal, Iowa, USA

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