December weather forecast
Dayton, PA

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Weather in December

December, the first month of the winter in Dayton, is also a wintry month, with an average temperature varying between 36.7°F (2.6°C) and 25.7°F (-3.5°C).

Temperature

In the transition to December, Dayton observes a drop in the average high-temperature, moving from a frosty 46.2°F (7.9°C) in November to an icy 36.7°F (2.6°C). The low-temperature averages to a freezing cold 25.7°F (-3.5°C) during the nights of December.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In Dayton, in December, during 10.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Dayton, during the entire year, the rain falls for 151.9 days and collects up to 22.13" (562mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, in Dayton, Pennsylvania, it is snowing for 14.6 days. Throughout December, 4.21" (107mm) of snow is accumulated. In Dayton, during the entire year, snow falls for 71 days and aggregates up to 22.32" (567mm) 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, sunrise is at 7:22 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:59 pm EST.

Sunshine

In December, the average sunshine is 2.6h.

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 minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 1 during December translates into these guidelines:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Dayton, records 36.7°F (2.6°C), while the low-temperature is 25.7°F (-3.5°C). In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 86°F (30°C).

What is the average humidity in December?

In Dayton, the average relative humidity in December is 86%.

How many days does it rain in December?

In December, the rain falls for 10.5 days. Throughout December, 1.73" (44mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 14.6 days. Throughout December, 4.21" (107mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 9h and 18min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:22 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:59 pm EST.

How many hours of sunshine does Dayton have in December?

In December, the average sunshine duration is 2.6h.

When is the lowest UV index?

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

How high is the UV index in December?

In Dayton, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Dayton, PA

Average temperature in December - Dayton, PA
  • Average high temperature in December: 36.7°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

Average pressure in December
Dayton, PA

Average pressure in December - Dayton, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Dayton, PA

Average wind speed in December - Dayton, PA
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Dayton, PA

Average humidity in December - Dayton, PA
  • Average humidity in December: 86%

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June, July and August (78%).

Average rainfall in December
Dayton, PA

Average rainfall in December - Dayton, PA
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is November (1.26").

Average rainfall days in December
Dayton, PA

Average rainfall days in December - Dayton, PA
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
Dayton, PA

Average snowfall in December - Dayton, PA
  • Average snowfall in December: 4.21"

The month with the highest snowfall is January (5.63").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Dayton, PA

Average snowfall days in December - Dayton, PA
  • Average snowfall days in December: 14.6 days

The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Dayton, PA

Average daylight in December / Average sunshine in December - Dayton, PA
  • 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: 2h and 4min

The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).

Average sunshine days in December
Dayton, PA

Average sunshine days in December - Dayton, PA
  • Average sunshine days in December: 9.2 days

The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (7.8 days).

Average UV index in December
Dayton, PA

Average UV index in December - Dayton, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Dayton, PA

Average cloud cover in December - Dayton, PA
  • Average cloud cover in December: 72

The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 39).

Average visibility in December
Dayton, PA

Average visibility in December - Dayton, PA
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).

Dayton, Pennsylvania, USA

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