December weather forecast
Arnold, IA

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Weather in December

December, the first month of the winter in Arnold, is still a freezing cold month, with an average temperature varying between 30°F (-1.1°C) and 19°F (-7.2°C).

Temperature

With the beginning of December, the average high-temperature shows a decrease, transitioning from a chilly 44.1°F (6.7°C) in November to a subzero cold 30°F (-1.1°C). Arnold's nighttime temperature in December drops to an average of 19°F (-7.2°C).

Humidity

In December, the average relative humidity is 83%.

Rainfall

In December, the rain falls for 5.1 days. Throughout December, 1.26" (32mm) of precipitation is accumulated. Throughout the year, in Arnold, there are 130.6 rainfall days, and 25" (635mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Arnold, in December, snow falls for 9.3 days, with typically accumulated 2.76" (70mm) of snow. In Arnold, during the entire year, snow falls for 41.2 days and aggregates up to 18.11" (460mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:47 am and sunset at 4:52 pm CST.

Sunshine

In Arnold, the average sunshine in December is 4.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In December, a daily UV index of 2 turns into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Always opt for UVA and UVB-resistant sunglasses on radiant days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

An average high-temperature, in December, in Arnold, is 30°F (-1.1°C) and the average low-temperature is 19°F (-7.2°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 83%.

How much does it rain in December?

In December, the rain falls for 5.1 days. Throughout December, 1.26" (32mm) of precipitation is accumulated.

How much does it snow in December?

In Arnold, in December, snow falls for 9.3 days, with typically accumulated 2.76" (70mm) 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 Arnold have in December?

In December, the average day length is 9h and 5min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:28 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 4:52 pm CST.

How many hours of sunshine does Arnold have in December?

In Arnold, the average sunshine duration in December is 4.5h.

When is the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

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

Average temperature in December - Arnold, IA
  • Average high temperature in December: 30°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in December: 19°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).

Average pressure in December
Arnold, IA

Average pressure in December - Arnold, IA
  • Average pressure in December: 30.12"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
Arnold, IA

Average wind speed in December - Arnold, IA
  • Average wind speed in December: 10.3mph

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

Average humidity in December
Arnold, IA

Average humidity in December - Arnold, IA
  • Average humidity in December: 83%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (68%).

Average rainfall in December
Arnold, IA

Average rainfall in December - Arnold, IA
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is June (3.7").
The driest month (with the least rainfall) is January (0.94").

Average rainfall days in December
Arnold, IA

Average rainfall days in December - Arnold, IA
  • Average rainfall days in December: 5.1 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.7 days).

Average snowfall in December
Arnold, IA

Average snowfall in December - Arnold, IA
  • Average snowfall in December: 2.76"

The month with the highest snowfall is February (5").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Arnold, IA

Average snowfall days in December - Arnold, IA
  • Average snowfall days in December: 9.3 days

The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Arnold, 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 3min

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 0min).

Average sunshine days in December
Arnold, IA

Average sunshine days in December - Arnold, IA
  • Average sunshine days in December: 17.8 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in December
Arnold, IA

Average UV index in December - Arnold, IA
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Arnold, IA

Average cloud cover in December - Arnold, IA
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and September (Cloud cover 30).

Average visibility in December
Arnold, IA

Average visibility in December - Arnold, 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).

Arnold, Iowa, USA

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