January weather forecast
Saint Clair, PA

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Weather in January

January, the same as December, is another cold winter month in Saint Clair, Pennsylvania, with an average temperature ranging between max 32.5°F (0.3°C) and min 20.5°F (-6.4°C).

Temperature

The lowest temperatures are recorded in January, with averages reaching a high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C).

Humidity

In January, the average relative humidity in Saint Clair is 80%.

Rainfall

In Saint Clair, during January, the rain falls for 10.8 days and regularly aggregates up to 2.68" (68mm) of precipitation. In Saint Clair, during the entire year, the rain falls for 172.9 days and collects up to 34.21" (869mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. The month with the most snowfall is January, when snow falls for 11.8 days and typically aggregates up to 5.47" (139mm) of snow.

Daylight

The average length of the day in January in Saint Clair is 9h and 39min.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:47 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:20 pm EST.

Sunshine

The months with the least sunshine in Saint Clair, Pennsylvania, are January, February and December, with an average of 4.4h of sunshine.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 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 daily high UV index of 2 during January translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Experience reduced UV exposure by about half when donning a wide-brim hat. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Frequently asked questions

What month is the coldest in Saint Clair?

Saint Clair, Pennsylvania, reaches its average lowest temperatures in January, measuring 32.5°F (0.3°C) at the peak and 20.5°F (-6.4°C) at the lowest.

How cold is January in Saint Clair?

The high-temperature, in January, in Saint Clair, records 32.5°F (0.3°C), while the low-temperature is 20.5°F (-6.4°C).

What is the average humidity in January in Saint Clair?

In Saint Clair, Pennsylvania, the average relative humidity in January is 80%.

How many days does it rain in January in Saint Clair?

In January, the rain falls for 10.8 days. Throughout January, 2.68" (68mm) of precipitation is accumulated.

What is the snowiest month in Saint Clair?

The month with the most snowfall in Saint Clair, Pennsylvania, is January, when snow falls for 11.8 days and typically aggregates up to 5.47" (139mm) of snow.

How much does it snow in Saint Clair in January?

In Saint Clair, during January, snow falls for 11.8 days and regularly aggregates up to 5.47" (139mm) of snow.

How many hours of daylight does Saint Clair have in January?

In Saint Clair, Pennsylvania, the average day length in January is 9h and 39min.

When are sunrise and sunset in January in Saint Clair?

On the first day of January in Saint Clair, Pennsylvania, sunrise is at 7:28 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:20 pm EST.

What are the months with the least sunshine in Saint Clair?

January, February and December, with an average of 4.4h of sunshine, are months with the least sunshine in Saint Clair.

How many hours of sunshine does Saint Clair have in January?

In Saint Clair, Pennsylvania, the average sunshine duration in January is 4.4h.

What is the month with the lowest UV index in Saint Clair?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Saint Clair.

What is the UV index reading in January in Saint Clair?

In Saint Clair, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
38.8°F 3.8°C
32.5°F 0.3°C
36.1°F 2.3°C
Average low temperature
27.7°F -2.4°C
20.5°F -6.4°C
22.3°F -5.4°C
Average pressure
30.1" 765mmHg
30.09" 764mmHg
30.06" 764mmHg
Average wind speed
7.7mph 12.4km/h
8.1mph 13km/h
8.1mph 13km/h
Average max. wind speed
8.3mph 13.4km/h
8.8mph 14.2km/h
8.8mph 14.2km/h
Average wind speed gusts
12.5mph 20.1km/h
13mph 20.9km/h
13mph 20.9km/h
Average humidity
81%
80%
83%
Average rainfall
2.87" 73mm
2.68" 68mm
2.6" 66mm
Average rainfall days
13.5
10.8
10.9
Average snowfall
2.8" 71mm
5.47" 139mm
4.84" 123mm
Average snowfall days
6.9
11.8
10.4
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 2min
4h 2min
4h 2min
Average sunshine days
14.2
13.3
10.6
Average UV index
2
2
2
Average cloud cover
53%
52%
53%
Average visibility
5mi 8km
5mi 8km
5mi 8km

Average temperature in January
Saint Clair, PA

Average temperature in January - Saint Clair, PA
  • Average high temperature in January: 32.5°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in January: 20.5°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure in January
Saint Clair, PA

Average pressure in January - Saint Clair, PA
  • Average pressure in January: 30.09"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in January
Saint Clair, PA

Average wind speed in January - Saint Clair, PA
  • Average wind speed in January: 8.1mph

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in January
Saint Clair, PA

Average humidity in January - Saint Clair, PA
  • Average humidity in January: 80%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).

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Average rainfall in January
Saint Clair, PA

Average rainfall in January - Saint Clair, PA
  • Average rainfall in January: 2.68"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (2.09").

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Average rainfall days in January
Saint Clair, PA

Average rainfall days in January - Saint Clair, PA
  • Average rainfall days in January: 10.8 days

The month with the highest number of rainy days is May (18.7 days).
The months with the least rainy days are January and November (10.8 days).

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Average snowfall in January
Saint Clair, PA

Average snowfall in January - Saint Clair, PA
  • Average snowfall in January: 5.47"

The month with the highest snowfall is January (5.47").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Saint Clair, PA

Average snowfall days in January - Saint Clair, PA
  • Average snowfall days in January: 11.8 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Saint Clair, PA

Average daylight in January / Average sunshine in January - Saint Clair, PA
  • Average daylight in January: 9h and 4min

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 January: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 24min).

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Average sunshine days in January
Saint Clair, PA

Average sunshine days in January - Saint Clair, PA
  • Average sunshine days in January: 13.3 days

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is May (9.6 days).

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Average UV index in January
Saint Clair, PA

Average UV index in January - Saint Clair, PA
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in January
Saint Clair, PA

Average cloud cover in January - Saint Clair, PA
  • Average cloud cover in January: 52

The months with the most cloud cover are February and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in January
Saint Clair, PA

Average visibility in January - Saint Clair, PA
  • Average visibility in January: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

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Saint Clair, Pennsylvania, USA

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