December weather forecast
Hartwick, IA

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Weather in December

The first month of the winter, December, is also an icy month in Hartwick, Iowa, with an average temperature fluctuating between 22.1°F (-5.5°C) and 32.9°F (0.5°C).

Temperature

Hartwick's December weather shows a moderate shift in high-temperatures, falling from November's chilly 46.2°F (7.9°C) to a wintry 32.9°F (0.5°C). In Hartwick, the expected average low-temperature for December is a freezing cold 22.1°F (-5.5°C).

Humidity

In December, the average relative humidity is 81%.

Rainfall

In December, in Hartwick, the rain falls for 7.2 days. Throughout December, 1.26" (32mm) of precipitation is accumulated. Throughout the year, there are 135.6 rainfall days, and 27.48" (698mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Hartwick are January through May, October through December. In Hartwick, during December, snow falls for 7.3 days and regularly aggregates up to 2.13" (54mm) of snow. In Hartwick, during the entire year, snow falls for 35.5 days and aggregates up to 13.98" (355mm) 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 7:17 am and sunset at 4:39 pm. On the last day of December, in Hartwick, sunrise is at 7:36 am and sunset at 4:48 pm CST.

Sunshine

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

UV index

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Hartwick in December?

During December, Hartwick experiences an average high-temperature of 32.9°F (0.5°C) and a low-temperature of 22.1°F (-5.5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in July is evaluated at 87.8°F (31°C).

What is the average humidity in December in Hartwick?

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

How many days does it rain in December in Hartwick?

In Hartwick, Iowa, in December, it is raining for 7.2 days, with typically 1.26" (32mm) of accumulated precipitation.

How many days does it snow in December in Hartwick?

In Hartwick, Iowa, in December, during 7.3 snowfall days, 2.13" (54mm) of snow is typically accumulated.

What is the month with the shortest days in Hartwick?

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

How many hours of daylight does Hartwick have in December?

The average day length in December is 9h and 12min.

When is the sunrise / sunset in December in Hartwick?

On the first day of December in Hartwick, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:48 pm CST.

How many hours of sunshine does Hartwick have in December?

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

What is the UV index intensity in December in Hartwick?

The average daily maximum UV index in December in Hartwick is 2. A UV Index estimate of 2, and below, represents a low health threat from unsafe 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
Hartwick, IA

Average temperature in December - Hartwick, IA
  • Average high temperature in December: 32.9°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°F).

  • Average low temperature in December: 22.1°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 (13.6°F).

Average pressure in December
Hartwick, IA

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

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in December
Hartwick, IA

Average wind speed in December - Hartwick, IA
  • Average wind speed in December: 10.2mph

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

Average humidity in December
Hartwick, IA

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

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

Average rainfall in December
Hartwick, IA

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

The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is January (1.02").

Average rainfall days in December
Hartwick, IA

Average rainfall days in December - Hartwick, IA
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (4.6 days).

Average snowfall in December
Hartwick, IA

Average snowfall in December - Hartwick, IA
  • Average snowfall in December: 2.13"

The month with the highest snowfall is January (4.49").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Hartwick, IA

Average snowfall days in December - Hartwick, IA
  • Average snowfall days in December: 7.3 days

The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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

Average sunshine days in December
Hartwick, IA

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

The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.8 days).

Average UV index in December
Hartwick, IA

Average UV index in December - Hartwick, 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 January (UV index 1).

Average cloud cover in December
Hartwick, IA

Average cloud cover in December - Hartwick, 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
Hartwick, IA

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

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

Hartwick, Iowa, USA

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