December weather forecast
Menlo, IA

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Weather in December

The first month of the winter, December, is also a wintry month in Menlo, Iowa, with an average temperature ranging between min 21.7°F (-5.7°C) and max 33.3°F (0.7°C).

Temperature

The average high-temperature drops in December, from November's frosty 46.8°F (8.2°C) to an icy 33.3°F (0.7°C). In Menlo, an average low-temperature of 21.7°F (-5.7°C) is recorded during December nights.

Humidity

In Menlo, the average relative humidity in December is 79%.

Rainfall

In Menlo, in December, it is raining for 4.1 days, with typically 0.67" (17mm) of accumulated precipitation. In Menlo, Iowa, during the entire year, the rain falls for 117.3 days and collects up to 19.09" (485mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Menlo, during December, snow falls for 6 days and regularly aggregates up to 1.3" (33mm) of snow. In Menlo, during the entire year, snow falls for 31.7 days and aggregates up to 9.29" (236mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:25 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 4:57 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index in Menlo are January and December, with an average maximum UV index of 1. 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: The daily high UV index of 1 in December translates into this 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. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Menlo?

In December, the average high-temperature and low-temperature in Menlo, Iowa, are 33.3°F (0.7°C) and 21.7°F (-5.7°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is evaluated at 86°F (30°C).

What is the average humidity in December in Menlo?

In Menlo, Iowa, the average relative humidity in December is 79%.

How much does it rain in Menlo in December?

In Menlo, in December, during 4.1 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

How much does it snow in Menlo in December?

In Menlo, Iowa, in December, snow falls for 6 days, with typically accumulated 1.3" (33mm) of snow.

What is the month with the shortest days in Menlo?

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

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

In Menlo, the average day length in December is 9h and 14min.

What time are sunrise and sunset in December in Menlo?

On the first day of December, sunrise is at 7:25 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 4:57 pm CST.

How long on average sun shines in December in Menlo?

The average sunshine duration in December is 4.8h.

What is the month with the lowest UV index in Menlo?

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

What is the UV index intensity in December in Menlo?

In Menlo, 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 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
Menlo, IA

Average temperature in December - Menlo, IA
  • Average high temperature in December: 33.3°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in December: 21.7°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).

Average pressure in December
Menlo, IA

Average pressure in December - Menlo, 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
Menlo, IA

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

The windiest months (with the highest average wind speed) are January and February (10.6mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

Average humidity in December
Menlo, IA

Average humidity in December - Menlo, IA
  • Average humidity in December: 79%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (70%).

Average rainfall in December
Menlo, IA

Average rainfall in December - Menlo, IA
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is June (3.11").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in December
Menlo, IA

Average rainfall days in December - Menlo, IA
  • Average rainfall days in December: 4.1 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (2.9 days).

Average snowfall in December
Menlo, IA

Average snowfall in December - Menlo, IA
  • Average snowfall in December: 1.3"

The month with the highest snowfall is February (2.76").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Menlo, IA

Average snowfall days in December - Menlo, IA
  • Average snowfall days in December: 6 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 12min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in December
Menlo, IA

Average sunshine days in December - Menlo, IA
  • Average sunshine days in December: 22 days

The month with the most sunshine days is December (22 days).
The month with the least sunshine days is May (12.1 days).

Average UV index in December
Menlo, IA

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

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

Average cloud cover in December
Menlo, IA

Average cloud cover in December - Menlo, IA
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and September (Cloud cover 30).

Average visibility in December
Menlo, IA

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

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

Menlo, Iowa, USA

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