December weather forecast
Delmar, IA

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Weather in December

December, the first month of the winter in Delmar, is also a wintry month, with an average temperature varying between 32.7°F (0.4°C) and 22.3°F (-5.4°C).

Temperature

During the transition into December, Delmar observes a decrease in the average high-temperature, falling from a chilly 45°F (7.2°C) in November to a cold 32.7°F (0.4°C). In Delmar, December is marked by an average low-temperature of 22.3°F (-5.4°C).

Humidity

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

Rainfall

In Delmar, Iowa, in December, during 6.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Delmar, during the entire year, the rain falls for 143.3 days and collects up to 29.76" (756mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Delmar, during December, snow falls for 8.3 days and regularly aggregates up to 2.6" (66mm) of snow. In Delmar, during the entire year, snow falls for 40.2 days and aggregates up to 17.48" (444mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:11 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:41 pm CST.

Sunshine

In Delmar, the average sunshine in December is 4.2h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 1 translates into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.

Frequently asked questions

How cold is it in December?

In Delmar, 32.7°F (0.4°C) is the average high-temperature and 22.3°F (-5.4°C) is the average low-temperature during December.

What is the average humidity in December?

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

How many days does it rain in December?

In Delmar, in December, it is raining for 6.9 days, with typically 1.5" (38mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 8.3 days. Throughout December, 2.6" (66mm) of snow is accumulated.

What is the month with the shortest days?

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

How many hours of daylight does Delmar have in December?

In Delmar, the average day length in December is 9h and 11min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:41 pm CST.

How long on average sun shines in December?

The average sunshine duration in December is 4.2h.

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

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Delmar, IA

Average temperature in December - Delmar, IA
  • Average high temperature in December: 32.7°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (25.9°F).

  • Average low temperature in December: 22.3°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in December
Delmar, IA

Average pressure in December - Delmar, 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
Delmar, IA

Average wind speed in December - Delmar, IA
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity in December
Delmar, IA

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

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

Average rainfall in December
Delmar, IA

Average rainfall in December - Delmar, IA
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is January (1.34").

Average rainfall days in December
Delmar, IA

Average rainfall days in December - Delmar, IA
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (5.3 days).

Average snowfall in December
Delmar, IA

Average snowfall in December - Delmar, IA
  • Average snowfall in December: 2.6"

The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Delmar, IA

Average snowfall days in December - Delmar, IA
  • Average snowfall days in December: 8.3 days

The month with the highest number of snowfall days is January (11 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
Delmar, IA

Average daylight in December / Average sunshine in December - Delmar, 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 month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).

Average sunshine days in December
Delmar, IA

Average sunshine days in December - Delmar, IA
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10.2 days).

Average UV index in December
Delmar, IA

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

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

Average cloud cover in December
Delmar, IA

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

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 31).

Average visibility in December
Delmar, IA

Average visibility in December - Delmar, 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).

Delmar, Iowa, USA

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