December weather forecast
Lewis, IA

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Weather in December

December, the first month of the winter in Lewis, is also a wintry month, with an average temperature ranging between max 33.4°F (0.8°C) and min 21°F (-6.1°C).

Temperature

December's onset corresponds with a shift in the average high-temperature, moving from a chilly 47.1°F (8.4°C) in November to a wintry 33.4°F (0.8°C). Lewis, in December, experiences an average temperature of 21°F (-6.1°C) at night.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Lewis, Iowa, in December, it is raining for 4.4 days, with typically 0.94" (24mm) of accumulated precipitation. Throughout the year, there are 118.7 rainfall days, and 20.79" (528mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Lewis, in December, during 6.4 snowfall days, 1.81" (46mm) of snow is typically accumulated. In Lewis, during the entire year, snow falls for 32.3 days and aggregates up to 9.41" (239mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December in Lewis, sunrise is at 7:27 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:01 pm CST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In December, in Lewis, the average high-temperature is 33.4°F (0.8°C), and the average low-temperature is 21°F (-6.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 79%.

How much does it rain in December?

In December, the rain falls for 4.4 days. Throughout December, 0.94" (24mm) of precipitation is accumulated.

How many days does it snow in December?

In Lewis, during December, snow falls for 6.4 days and regularly aggregates up to 1.81" (46mm) of snow.

What is the month with the shortest days?

The month with the shortest days in Lewis is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 15min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:27 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:01 pm CST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.9h.

What are the months with the lowest UV index?

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

In Lewis, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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
Lewis, IA

Average temperature in December - Lewis, IA
  • Average high temperature in December: 33.4°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in December: 21°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

Average pressure in December
Lewis, IA

Average pressure in December - Lewis, IA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

Average wind speed in December
Lewis, IA

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

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

Average humidity in December
Lewis, IA

Average humidity in December - Lewis, IA
  • Average humidity in December: 79%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (69%).

Average rainfall in December
Lewis, IA

Average rainfall in December - Lewis, IA
  • Average rainfall in December: 0.94"

The wettest month (with the highest rainfall) is June (3.7").
The driest month (with the least rainfall) is January (0.59").

Average rainfall days in December
Lewis, IA

Average rainfall days in December - Lewis, IA
  • Average rainfall days in December: 4.4 days

The month with the highest number of rainy days is June (16.4 days).
The month with the least rainy days is February (3.1 days).

Average snowfall in December
Lewis, IA

Average snowfall in December - Lewis, IA
  • Average snowfall in December: 1.81"

The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Lewis, IA

Average snowfall days in December - Lewis, IA
  • Average snowfall days in December: 6.4 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 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 30min).

Average sunshine days in December
Lewis, IA

Average sunshine days in December - Lewis, IA
  • Average sunshine days in December: 21.2 days

The month with the most sunshine days is December (21.2 days).
The month with the least sunshine days is June (10.8 days).

Average UV index in December
Lewis, IA

Average UV index in December - Lewis, IA
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

Average cloud cover in December
Lewis, IA

Average cloud cover in December - Lewis, IA
  • Average cloud cover in December: 48

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in December
Lewis, IA

Average visibility in December - Lewis, 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).

Lewis, Iowa, USA

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