December weather forecast
Ralston, IA

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Weather in December

The first month of the winter, December, is also a subzero cold month in Ralston, Iowa, with an average temperature ranging between max 31.8°F (-0.1°C) and min 20.8°F (-6.2°C).

Temperature

The commencement of December involves a temperature shift, with the average high-temperature dropping from a frosty 45.9°F (7.7°C) in November to a freezing cold 31.8°F (-0.1°C). December's average low-temperature reading settles at a still subzero cold 20.8°F (-6.2°C).

Humidity

The average relative humidity in December is 80%.

Rainfall

In Ralston, during December, the rain falls for 5 days and regularly aggregates up to 1.65" (42mm) of precipitation. In Ralston, during the entire year, the rain falls for 130.1 days and collects up to 27.28" (693mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 9.9 days. Throughout December, 4.02" (102mm) of snow is accumulated. Throughout the year, there are 44.8 snowfall days, and 19.8" (503mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:27 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:57 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

In Ralston, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 2 in December translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Updated: Jun 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Ralston, is 31.8°F (-0.1°C), while the low-temperature averages to 20.8°F (-6.2°C). In July, 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 estimated at 87.8°F (31°C).

What is the average humidity in December?

In Ralston, Iowa, the average relative humidity in December is 80%.

How many days does it rain in December?

In Ralston, during December, the rain falls for 5 days and regularly aggregates up to 1.65" (42mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 9.9 days. Throughout December, 4.02" (102mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

In Ralston, the average day length in December is 9h and 10min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:27 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 4:57 pm CST.

How many hours of sunshine does Ralston have in December?

The average sunshine duration in December is 4.8h.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes 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
Ralston, IA

Average temperature in December - Ralston, IA
  • Average high temperature in December: 31.8°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in December: 20.8°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).

Average pressure in December
Ralston, IA

Average pressure in December - Ralston, 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 (29.88"Hg).

Average wind speed in December
Ralston, IA

Average wind speed in December - Ralston, IA
  • Average wind speed in December: 10.6mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).

Average humidity in December
Ralston, IA

Average humidity in December - Ralston, IA
  • Average humidity in December: 80%

The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are April and October (69%).

Average rainfall in December
Ralston, IA

Average rainfall in December - Ralston, IA
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (0.94").

Average rainfall days in December
Ralston, IA

Average rainfall days in December - Ralston, IA
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (4.3 days).

Average snowfall in December
Ralston, IA

Average snowfall in December - Ralston, IA
  • Average snowfall in December: 4.02"

The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Ralston, IA

Average snowfall days in December - Ralston, IA
  • Average snowfall days in December: 9.9 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • 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 12min).

Average sunshine days in December
Ralston, IA

Average sunshine days in December - Ralston, IA
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (10 days).

Average UV index in December
Ralston, IA

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

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in December
Ralston, IA

Average cloud cover in December - Ralston, IA
  • Average cloud cover in December: 50

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in December
Ralston, IA

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

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

Ralston, Iowa, USA

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