January weather forecast
Dayton, OH

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YearJanuaryFMAMJJASOND
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The Maimi and Mad rivers converge to flow through Dayton city, Ohio
The Maimi and Mad rivers converge to flow through Dayton city, Ohio

Weather in January

January brings a fresh start to Dayton, Ohio, accompanied by moderate cold and significant precipitation. The city often experiences snowy conditions this month, with temperatures dipping to a chilly 21.7°F (-5.7°C). The daylight hours are comparatively shorter, resulting in cooler days. Though considered a winter month, it manifests less harsh conditions as compared to other winter months in some regions. Expect temperature fluctuations to be more prominent in transition from December and towards February.

Temperature

January, with an average high of 33.6°F (0.9°C) and a low of 21.7°F (-5.7°C), signifies the coldest month of the year.

Humidity

January, February and December, with an average relative humidity of 82%, are the most humid months in Dayton.

Rainfall

In Dayton, during January, the rain falls for 7.7 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, in Dayton, there are 149.5 rainfall days, and 23.9" (607mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Dayton are January through April, October through December. January is the month with the most snowfall in Dayton. Snow falls for 8.2 days and accumulates 2.05" (52mm) of snow.

Daylight

In January, the average length of the day is 9h and 44min.
On the first day of January, sunrise is at 7:57 am and sunset at 5:22 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 5:54 pm EST.

Sunshine

With an average of 3.7h of sunshine, January has the least sunshine of the year in Dayton.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 2 in January transforms into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Experience reduced UV exposure by about half when donning a wide-brim hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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Frequently asked questions

What time of the year is the coldest in Dayton?

Dayton's coldest weather arrives in January, when temperatures average a high of 33.6°F (0.9°C) and a low of 21.7°F (-5.7°C).

How cold is January in Dayton?

The high-temperature, in January, in Dayton, records 33.6°F (0.9°C), while the low-temperature is 21.7°F (-5.7°C).

What are the most humid months in Dayton?

The months with the highest humidity in Dayton, Ohio, are January, February and December, with an average relative humidity of 82%.

What is the average humidity in January in Dayton?

In Dayton, the average relative humidity in January is 82%.

How much does it rain in Dayton in January?

In Dayton, Ohio, during January, the rain falls for 7.7 days and regularly aggregates up to 1.57" (40mm) of precipitation.

When does it snow the most in Dayton?

January is the month with the most snowfall in Dayton, Ohio. Snow falls for 8.2 days and accumulates 2.05" (52mm) of snow.

How much does it snow in Dayton in January?

In Dayton, during January, snow falls for 8.2 days and regularly aggregates up to 2.05" (52mm) of snow.

What is the average length of the day in January in Dayton?

In January, the average day length is 9h and 44min.

When is the sunrise / sunset in January in Dayton?

On the first day of January in Dayton, Ohio, sunrise is at 7:57 am and sunset at 5:22 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 5:54 pm EST.

What is the month with the least sunshine in Dayton?

The month with the least sunshine in Dayton is January, with an average of 3.7h of sunshine.

How many hours of sunshine does Dayton have in January?

The average sunshine duration in January in Dayton is 3.7h.

When is the lowest UV index in Dayton?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Dayton, Ohio.

What is the UV index reading in January in Dayton?

The average daily maximum UV index in January in Dayton, Ohio, is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
39.2°F 4°C
33.6°F 0.9°C
37.9°F 3.3°C
Average low temperature
28.9°F -1.7°C
21.7°F -5.7°C
24.6°F -4.1°C
Average pressure
30.12" 765mmHg
30.13" 765mmHg
30.1" 765mmHg
Average wind speed
9.2mph 14.8km/h
10mph 16.1km/h
9.9mph 15.9km/h
Average max. wind speed
9.8mph 15.8km/h
10.6mph 17.1km/h
10.5mph 16.9km/h
Average wind speed gusts
14.4mph 23.2km/h
15.7mph 25.3km/h
15.4mph 24.8km/h
Average humidity
82%
82%
82%
Average rainfall
1.81" 46mm
1.57" 40mm
1.61" 41mm
Average rainfall days
9.4
7.7
7.5
Average snowfall
1.38" 35mm
2.05" 52mm
1.97" 50mm
Average snowfall days
5.9
8.2
6.6
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 1min
3h 4min
4h 5min
Average sunshine days
16.7
16.3
14.9
Average UV index
2
2
2
Average cloud cover
57%
61%
58%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Dayton, OH

Average temperature in January - Dayton, OH
  • Average high temperature in January: 33.6°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in January: 21.7°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

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Average pressure in January
Dayton, OH

Average pressure in January - Dayton, OH
  • Average pressure in January: 30.13"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in January
Dayton, OH

Average wind speed in January - Dayton, OH
  • Average wind speed in January: 10mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity in January
Dayton, OH

Average humidity in January - Dayton, OH
  • Average humidity in January: 82%

The months with the highest relative humidity are January, February and December (82%).
The month with the lowest relative humidity is October (74%).

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Average rainfall in January
Dayton, OH

Average rainfall in January - Dayton, OH
  • Average rainfall in January: 1.57"

The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are September and November (1.5").

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Average rainfall days in January
Dayton, OH

Average rainfall days in January - Dayton, OH
  • Average rainfall days in January: 7.7 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (7.5 days).

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Average snowfall in January
Dayton, OH

Average snowfall in January - Dayton, OH
  • Average snowfall in January: 2.05"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Dayton, OH

Average snowfall days in January - Dayton, OH
  • Average snowfall days in January: 8.2 days

The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Dayton, OH

Average daylight in January / Average sunshine in January - Dayton, OH
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in January: 3h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in January
Dayton, OH

Average sunshine days in January - Dayton, OH
  • Average sunshine days in January: 16.3 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (9.8 days).

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Average UV index in January
Dayton, OH

Average UV index in January - Dayton, OH
  • Average UV index in January: 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, November and December (UV index 2).

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Average cloud cover in January
Dayton, OH

Average cloud cover in January - Dayton, OH
  • Average cloud cover in January: 61

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in January
Dayton, OH

Average visibility in January - Dayton, OH
  • Average visibility in January: 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).

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Dayton, Ohio, USA

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