December weather forecast
Onslow, IA

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Weather in December

The first month of the winter, December, is still a freezing cold month in Onslow, Iowa, with an average temperature fluctuating between 31.8°F (-0.1°C) and 21.4°F (-5.9°C).

Temperature

The onset of December coincides with a reduction in the average high-temperature, falling from a frosty 44.6°F (7°C) in November to a freezing cold 31.8°F (-0.1°C). During December, Onslow witnesses a consistent average low-temperature of 21.4°F (-5.9°C).

Humidity

In December, the average relative humidity in Onslow is 82%.

Rainfall

In Onslow, in December, it is raining for 7.7 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, there are 142.5 rainfall days, and 28.27" (718mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Onslow are January through April, October through December. In Onslow, in December, snow falls for 9.4 days, with typically accumulated 3.07" (78mm) of snow. In Onslow, during the entire year, snow falls for 43.2 days and aggregates up to 17.17" (436mm) of snow.

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 7:13 am and sunset at 4:33 pm. On the last day of December, in Onslow, sunrise is at 7:32 am and sunset at 4:42 pm CST.

Sunshine

The average sunshine in December in Onslow is 4.2h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Onslow. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the UV index of 1 transforms into the following advice:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Onslow in December?

The average high-temperature, in December, in Onslow, is 31.8°F (-0.1°C), while the average low-temperature is 21.4°F (-5.9°C).

What is the average humidity in December in Onslow?

In Onslow, the average relative humidity in December is 82%.

How much does it rain in Onslow in December?

In Onslow, Iowa, in December, during 7.7 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

How many days does it snow in December in Onslow?

In Onslow, during December, snow falls for 9.4 days and regularly aggregates up to 3.07" (78mm) of snow.

What is the month with the shortest days in Onslow?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

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

The average day length in December in Onslow is 9h and 10min.

When are sunrise and sunset in December in Onslow?

In December, on the first day of the month, sunrise is at 7:13 am and sunset at 4:33 pm. On the last day of the month, in Onslow, Iowa, sunrise is at 7:32 am and sunset at 4:42 pm CST.

How many hours of sunshine does Onslow have in December?

In Onslow, the average sunshine duration in December is 4.2h.

What are the months with the lowest UV index in Onslow?

The months with the lowest UV index in Onslow, Iowa, are January and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Onslow?

In Onslow, Iowa, the average daily maximum UV index in December is 1. A UV Index estimate 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
Onslow, IA

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

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in December: 21.4°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in December
Onslow, IA

Average pressure in December - Onslow, IA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in December
Onslow, IA

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

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in December
Onslow, IA

Average humidity in December - Onslow, IA
  • Average humidity in December: 82%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in December
Onslow, IA

Average rainfall in December - Onslow, IA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in December
Onslow, IA

Average rainfall days in December - Onslow, IA
  • Average rainfall days in December: 7.7 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in December
Onslow, IA

Average snowfall in December - Onslow, IA
  • Average snowfall in December: 3.07"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Onslow, IA

Average snowfall days in December - Onslow, IA
  • Average snowfall days in December: 9.4 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Onslow, 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 1min

The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Onslow, IA

Average sunshine days in December - Onslow, IA
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in December
Onslow, IA

Average UV index in December - Onslow, IA
  • Average UV index in December: 1

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Onslow, IA

Average cloud cover in December - Onslow, IA
  • Average cloud cover in December: 57

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in December
Onslow, IA

Average visibility in December - Onslow, 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).

Onslow, Iowa, USA

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