December weather forecast
Holbrook, IA

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Weather in December

December, the first month of the winter in Holbrook, is also a wintry month, with an average temperature fluctuating between 22.6°F (-5.2°C) and 33.6°F (0.9°C).

Temperature

The average high-temperature decreases in December, shifting from a frosty 46.6°F (8.1°C) in November to a cold 33.6°F (0.9°C). An average nighttime temperature of 22.6°F (-5.2°C) is witnessed throughout December.

Humidity

In Holbrook, the average relative humidity in December is 81%.

Rainfall

In Holbrook, Iowa, in December, it is raining for 6.4 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, in Holbrook, there are 142 rainfall days, and 29.09" (739mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Holbrook, in December, during 6.7 snowfall days, 2.17" (55mm) of snow is typically accumulated. Throughout the year, there are 35.1 snowfall days, and 15.43" (392mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:15 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:47 pm CST.

Sunshine

The average sunshine in December is 4.5h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 1 in December translates into this advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Updated: Jun 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 33.6°F (0.9°C) and a low-temperature of 22.6°F (-5.2°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 86°F (30°C).

What is the average humidity in December?

In Holbrook, the average relative humidity in December is 81%.

How much does it rain in December?

In Holbrook, during December, the rain falls for 6.4 days and regularly aggregates up to 1.42" (36mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 6.7 days. Throughout December, 2.17" (55mm) of snow is accumulated.

What is the month with the shortest days?

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 Holbrook, the average day length in December is 9h and 13min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:15 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:47 pm CST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.5h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health threat 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
Holbrook, IA

Average temperature in December - Holbrook, IA
  • Average high temperature in December: 33.6°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.1°F).

  • Average low temperature in December: 22.6°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

Average pressure in December
Holbrook, IA

Average pressure in December - Holbrook, IA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in December
Holbrook, IA

Average wind speed in December - Holbrook, IA
  • Average wind speed in December: 10.1mph

The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

Average humidity in December
Holbrook, IA

Average humidity in December - Holbrook, IA
  • Average humidity in December: 81%

The months with the highest relative humidity are January and July (84%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Holbrook, IA

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

The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is January (1.18").

Average rainfall days in December
Holbrook, IA

Average rainfall days in December - Holbrook, IA
  • Average rainfall days in December: 6.4 days

The months with the highest number of rainy days are May and June (18.5 days).
The month with the least rainy days is February (4.3 days).

Average snowfall in December
Holbrook, IA

Average snowfall in December - Holbrook, IA
  • Average snowfall in December: 2.17"

The month with the highest snowfall is January (4.8").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Holbrook, IA

Average snowfall days in December - Holbrook, IA
  • Average snowfall days in December: 6.7 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in December
Holbrook, IA

Average sunshine days in December - Holbrook, IA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (9.1 days).

Average UV index in December
Holbrook, IA

Average UV index in December - Holbrook, 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
Holbrook, IA

Average cloud cover in December - Holbrook, IA
  • Average cloud cover in December: 53

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).

Average visibility in December
Holbrook, IA

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

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

Holbrook, Iowa, USA

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