December weather forecast
Promise City, IA

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Weather in December

December, the first month of the winter in Promise City, is also an icy month, with an average temperature varying between 23.5°F (-4.7°C) and 35.6°F (2°C).

Temperature

During the transition into December, Promise City observes a decrease in the average high-temperature, falling from a chilly 48.4°F (9.1°C) in November to a cold 35.6°F (2°C). Promise City experiences a consistent average temperature of 23.5°F (-4.7°C) throughout the nights in December.

Humidity

The average relative humidity in December is 79%.

Rainfall

January and December are months with the least rain when the rain falls for 5.5 days and typically aggregates up to 0.71" (18mm) of rain.

Snowfall

Months with snowfall are January through May, October through December. In Promise City, during December, snow falls for 5.7 days and regularly aggregates up to 0.98" (25mm) of snow. In Promise City, during the entire year, snow falls for 28.4 days and aggregates up to 11.34" (288mm) of snow.

Daylight

The month with the shortest days in Promise City is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:36 am and sunset at 4:55 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

In Promise City, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

Frequently asked questions

How cold is December in Promise City?

December temperatures vary between a high-temperature of 35.6°F (2°C) and a low-temperature of 23.5°F (-4.7°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 87.8°F (31°C).

What is the average humidity in December?

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

What is the driest month?

The months with the least rainfall are January and December Rain falls for 5.5 days and accumulates 0.71" (18mm) of rain.

How much does it rain in December?

In Promise City, in December, it is raining for 5.5 days, with typically 0.71" (18mm) of accumulated precipitation.

How much does it snow in December?

In Promise City, in December, during 5.7 snowfall days, 0.98" (25mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In December, the average day length is 9h and 19min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:18 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:55 pm CST.

How many hours of sunshine does Promise City have in December?

The average sunshine duration in December is 4.8h.

How high is the UV index in December?

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.
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
Promise City, IA

Average temperature in December - Promise City, IA
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in December: 23.5°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

Average pressure in December
Promise City, IA

Average pressure in December - Promise City, 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 (29.89"Hg).

Average wind speed in December
Promise City, IA

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

The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

Average humidity in December
Promise City, IA

Average humidity in December - Promise City, IA
  • Average humidity in December: 79%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Promise City, IA

Average rainfall in December - Promise City, IA
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").

Average rainfall days in December
Promise City, IA

Average rainfall days in December - Promise City, IA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Promise City, IA

Average snowfall in December - Promise City, IA
  • Average snowfall in December: 0.98"

The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Promise City, IA

Average snowfall days in December - Promise City, IA
  • Average snowfall days in December: 5.7 days

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Promise City, IA

Average daylight in December / Average sunshine in December - Promise City, IA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in December
Promise City, IA

Average sunshine days in December - Promise City, IA
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).

Average UV index in December
Promise City, IA

Average UV index in December - Promise City, IA
  • Average UV index in December: 2

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

Average cloud cover in December
Promise City, IA

Average cloud cover in December - Promise City, IA
  • Average cloud cover in December: 48

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).

Average visibility in December
Promise City, IA

Average visibility in December - Promise City, IA
  • Average visibility in December: 6mi

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

Promise City, Iowa, USA

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