December weather forecast
Mechanicsville, IA

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Weather in December

The first month of the winter, December, is also a wintry month in Mechanicsville, Iowa, with an average temperature varying between 33.1°F (0.6°C) and 22.3°F (-5.4°C).

Temperature

December shows a mild decline in the average high-temperature, falling from November's frosty 45.3°F (7.4°C) to a cold 33.1°F (0.6°C). Mechanicsville's nights in December experience an average temperature drop to a freezing cold 22.3°F (-5.4°C).

Humidity

The average relative humidity in December is 81%.

Rainfall

In Mechanicsville, in December, it is raining for 6.8 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, in Mechanicsville, there are 147.9 rainfall days, and 31.57" (802mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In Mechanicsville, in December, during 9.5 snowfall days, 3.11" (79mm) of snow is typically accumulated. Throughout the year, there are 44 snowfall days, and 18.35" (466mm) of snow is accumulated.

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 7:13 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:44 pm CST.

Sunshine

In Mechanicsville, the average sunshine in December is 4.3h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 1 during December translates into the following guidance:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. To protect against the Sun's most potent rays, avoid direct exposure around midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.

Frequently asked questions

How cold is December?

The high-temperature during December is 33.1°F (0.6°C) and the low-temperature is 22.3°F (-5.4°C).

What is the average humidity in December in Mechanicsville?

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

How many days does it rain in December?

In Mechanicsville, in December, during 6.8 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 9.5 days. Throughout December, 3.11" (79mm) of snow is accumulated.

What is the month with the shortest days in Mechanicsville?

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

What is the average length of the day in December?

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

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:13 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:44 pm CST.

How long on average sun shines in December?

In Mechanicsville, Iowa, the average sunshine duration in December is 4.3h.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

How high is the UV index in December?

In December, the average daily maximum UV index in Mechanicsville is 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to 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
Mechanicsville, IA

Average temperature in December - Mechanicsville, IA
  • Average high temperature in December: 33.1°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 (26.2°F).

  • Average low temperature in December: 22.3°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).

Average pressure in December
Mechanicsville, IA

Average pressure in December - Mechanicsville, 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 (29.9"Hg).

Average wind speed in December
Mechanicsville, IA

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

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

Average humidity in December
Mechanicsville, IA

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

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Mechanicsville, IA

Average rainfall in December - Mechanicsville, IA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is January (1.34").

Average rainfall days in December
Mechanicsville, IA

Average rainfall days in December - Mechanicsville, IA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is May (19 days).
The months with the least rainy days are January and February (5.2 days).

Average snowfall in December
Mechanicsville, IA

Average snowfall in December - Mechanicsville, IA
  • Average snowfall in December: 3.11"

The month with the highest snowfall is January (5.79").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Mechanicsville, IA

Average snowfall days in December - Mechanicsville, IA
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Mechanicsville, 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 2min

The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in December
Mechanicsville, IA

Average sunshine days in December - Mechanicsville, IA
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (8.1 days).

Average UV index in December
Mechanicsville, IA

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

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

Average cloud cover in December
Mechanicsville, IA

Average cloud cover in December - Mechanicsville, IA
  • Average cloud cover in December: 55

The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 31).

Average visibility in December
Mechanicsville, IA

Average visibility in December - Mechanicsville, 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).

Mechanicsville, Iowa, USA

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