Climate and monthly weather forecastPontiac, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Pontiac, Illinois, with an average temperature fluctuating between 30.2°F (-1°C) and 18.5°F (-7.5°C). January, having an average high-temperature of 30.2°F (-1°C) and an average low-temperature of 18.5°F (-7.5°C), is the coldest month. Weather in January »Weather in February
The last month of the winter, February, is an icy month in Pontiac, Illinois, with an average temperature varying between 21.7°F (-5.7°C) and 34.9°F (1.6°C). As Pontiac, Illinois, transitions into February, the average high-temperature stands at a wintry 34.9°F (1.6°C), offering little variation from the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Pontiac, Illinois, with an average temperature varying between 33.4°F (0.8°C) and 47.5°F (8.6°C). The start of March signals an increase in the average high-temperature, moving from a cold 34.9°F (1.6°C) in February to a frosty 47.5°F (8.6°C). Weather in March »Weather in April
April in Pontiac, Illinois, is a refreshing spring month, with temperature in the range of an average low of 43.7°F (6.5°C) and an average high of 59.7°F (15.4°C). The arrival of April brings a change in Pontiac's weather, with average high-temperatures moving from March's frosty 47.5°F (8.6°C) to a refreshing 59.7°F (15.4°C). Weather in April »Weather in May
May, the last month of the spring in Pontiac, is a pleasant month, with an average temperature ranging between min 54.7°F (12.6°C) and max 71.2°F (21.8°C). The rise of average high-temperatures is seen in May, with an increase from a moderate 59.7°F (15.4°C) in April to an agreeable 71.2°F (21.8°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Pontiac, Illinois, with an average temperature varying between 79.3°F (26.3°C) and 62.4°F (16.9°C). As June begins, there's a slight increase in the average high-temperature, moving from an agreeable 71.2°F (21.8°C) in May to a moderately hot 79.3°F (26.3°C). Weather in June »Weather in July
July, like June, in Pontiac, Illinois, is a moderately hot summer month, with an average temperature fluctuating between 81°F (27.2°C) and 64.6°F (18.1°C). July, with an average high of 81°F (27.2°C) and a low of 64.6°F (18.1°C), signifies the warmest month of the year. July's average heat index is calculated to be a tropical 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Pontiac, Illinois, with an average temperature ranging between min 62.4°F (16.9°C) and max 80.1°F (26.7°C). The initiation of August sees an average high-temperature of a still moderately hot 80.1°F (26.7°C), showing minor variations from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Pontiac, is also a moderately hot month, with an average temperature ranging between min 57°F (13.9°C) and max 75.6°F (24.2°C). The onset of September notes an average high-temperature of a still moderately hot 75.6°F (24.2°C), subtly shifted from August's 80.1°F (26.7°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Pontiac, Illinois, with an average temperature ranging between min 46.6°F (8.1°C) and max 62.2°F (16.8°C). Start of October brings a shift in the average high-temperature, falling from September's warm 75.6°F (24.2°C) to an enjoyable 62.2°F (16.8°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Pontiac, Illinois, with temperature in the range of an average high of 47.5°F (8.6°C) and an average low of 34.9°F (1.6°C). With the onset of November, Pontiac experiences a noticeable temperature shift, with the average high-temperature receding from an enjoyable 62.2°F (16.8°C) in October to a chilly 47.5°F (8.6°C). Weather in November »Weather in December
December, the first month of the winter in Pontiac, is also an icy month, with an average temperature fluctuating between 25.9°F (-3.4°C) and 36.5°F (2.5°C). The move into December indicates a reduction in the average high-temperature, down from November's frosty 47.5°F (8.6°C) to a wintry 36.5°F (2.5°C). Weather in December »Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, with an average high of 30.2°F (-1°C) and a low of 18.5°F (-7.5°C), signifies the coldest month of the year.
The months with the least rainfall are January and February Rain falls for 4.3 days and accumulates 0.71" (18mm) of rain.
Throughout the year, there are 125.3 rainfall days, and 15.71" (399mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
The month with the most snowfall is January, when snow falls for 10.2 days and typically aggregates up to 1.73" (44mm) of snow.
Throughout the year, there are 30.6 snowfall days, and 6.93" (176mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 3.8h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
May is the month with the most rainfall. Rain falls for 16.8 days and accumulates 2.44" (62mm) of precipitation.
In Pontiac, snow does not fall in May through September.
With an average of 15h and 6min of daylight, June has the longest days of the year.
The months with the most sunshine are June and August, with an average of 9.8h of sunshine.
June and July, with an average maximum UV index of 6, are months with the highest UV index.
Pontiac's warmest temperatures are experienced in July, with average high temperatures of 81°F (27.2°C) and lows of 64.6°F (18.1°C).
With an average relative humidity of 85%, July is the most humid month.
October is the least humid month, with an average relative humidity of 71%.
With an average of 9h and 18min of daylight, December has the shortest days of the year.
With an average maximum UV index of 1, December is the month with the lowest UV index.
Average temperature
Pontiac, IL
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.2°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure
Pontiac, IL
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Pontiac, IL
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.2mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Pontiac, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Pontiac, IL
- Average rainfall in January:
0.71" - Average rainfall in February:
0.71" - Average rainfall in March:
1.18" - Average rainfall in April:
1.77" - Average rainfall in May:
2.44" - Average rainfall in June:
1.93"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.3" - Average rainfall in September:
1.06" - Average rainfall in October:
1.26" - Average rainfall in November:
0.79" - Average rainfall in December:
0.75"
The wettest month (with the highest rainfall) is May (2.44").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days
Pontiac, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.7 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
13 days - Average rainfall days in May:
16.8 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
6.7 days - Average rainfall days in December:
6.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.3 days).
Average snowfall
Pontiac, IL
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Pontiac, IL
- Average snowfall days in January:
10.2 days - Average snowfall days in February:
7.2 days - Average snowfall days in March:
4.1 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.2 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
6.3 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Pontiac, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
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 January:
3h and 48min - Average sunshine in February:
4h and 6min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 54min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
9h and 36min - Average sunshine in August:
9h and 48min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 18min
The months with the most sunshine are June and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Pontiac, IL
- Average sunshine days in January:
18.5 days - Average sunshine days in February:
16.7 days - Average sunshine days in March:
15.9 days - Average sunshine days in April:
14 days - Average sunshine days in May:
11.6 days - Average sunshine days in June:
11.9 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
17.8 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
20.5 days - Average sunshine days in December:
19.3 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (11.3 days).
Average UV index
Pontiac, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Pontiac, IL
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility
Pontiac, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
