Climate and monthly weather forecastPlano, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Plano, Illinois, is a freezing cold winter month, with an average temperature ranging between max 28.2°F (-2.1°C) and min 16.2°F (-8.8°C). The coldest month is January, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 16.2°F (-8.8°C). Weather in January »Weather in February
February, the last month of the winter in Plano, is a cold month, with an average temperature varying between 19.2°F (-7.1°C) and 32.2°F (0.1°C). As Plano transitions from January to February, the average high-temperatures adjust to an icy 32.2°F (0.1°C), nearly the same as the previous 28.2°F (-2.1°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Plano, Illinois, with an average temperature fluctuating between 31.3°F (-0.4°C) and 45.9°F (7.7°C). As March arrives, a rise in the average high-temperature is observed, moving from a wintry 32.2°F (0.1°C) in February to a frosty 45.9°F (7.7°C). Weather in March »Weather in April
April in Plano, Illinois, is a moderate spring month, with temperature in the range of an average high of 57.4°F (14.1°C) and an average low of 41.2°F (5.1°C). As Plano enters April, the average high-temperature increases from the a frosty 45.9°F (7.7°C) of March to a moderate 57.4°F (14.1°C). Weather in April »Weather in May
May, the last month of the spring in Plano, is an agreeable month, with temperature in the range of an average high of 69.6°F (20.9°C) and an average low of 52.3°F (11.3°C). In Plano, stepping into May brings a temperature increase, moving up from April's moderate 57.4°F (14.1°C) to an agreeable 69.6°F (20.9°C). Weather in May »Weather in June
June, the first month of the summer in Plano, is a warm month, with an average temperature fluctuating between 78.3°F (25.7°C) and 60.8°F (16°C). As June begins, there's a slight increase in the average high-temperature, moving from a pleasant 69.6°F (20.9°C) in May to a warm 78.3°F (25.7°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Plano, Illinois, with temperature in the range of an average high of 80.6°F (27°C) and an average low of 63.5°F (17.5°C). July, recognised by an average high temperature of 80.6°F (27°C) and a low of 63.5°F (17.5°C), is Plano's warmest month. The heat index for July is estimated at a hot 86°F (30°C). Weather in July »Weather in August
August, the last month of the summer in Plano, is also a moderately hot month, with an average temperature ranging between max 79.3°F (26.3°C) and min 61.7°F (16.5°C). Plano, Illinois, registers an average high-temperature of a still moderately hot 79.3°F (26.3°C) with the arrival of August, showing minor deviation from the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Plano, Illinois, with an average temperature fluctuating between 55.6°F (13.1°C) and 73.8°F (23.2°C). Plano's September weather shows a modest shift in high-temperatures, falling from August's 79.3°F (26.3°C) to a still warm 73.8°F (23.2°C). Weather in September »Weather in October
October, the same as September, in Plano, Illinois, is another refreshing autumn month, with temperature in the range of an average high of 60.6°F (15.9°C) and an average low of 45°F (7.2°C). October involves a decrease in temperature, down from a moderately hot 73.8°F (23.2°C) in September to a moderate 60.6°F (15.9°C). Weather in October »Weather in November
November, the last month of the autumn in Plano, is also a frosty month, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 45.9°F (7.7°C). A noticeable downshift in temperatures is seen as October gives way to November, with average highs moving from a refreshing 60.6°F (15.9°C) to a frosty 45.9°F (7.7°C). Weather in November »Weather in December
December, the first month of the winter in Plano, is also an icy month, with temperature in the range of an average low of 23.9°F (-4.5°C) and an average high of 34.2°F (1.2°C). Plano's December weather comes with a decrease in average high-temperatures, moving from a chilly 45.9°F (7.7°C) in November to an icy 34.2°F (1.2°C). Weather in December »Updated: Feb 12, 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 is the coldest month in Plano, Illinois, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 16.2°F (-8.8°C).
Throughout the year, in Plano, Illinois, there are 168.3 rainfall days, and 35.47" (901mm) of precipitation is accumulated.
January through April, October through December are months with snowfall in Plano.
January is the month with the most snowfall. Snow falls for 13.4 days and accumulates 4.88" (124mm) of snow.
In Plano, Illinois, during the entire year, snow falls for 47.1 days and aggregates up to 16.61" (422mm) of snow.
With an average of 3.8h of sunshine, January has the least sunshine of the year.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Plano, Illinois, 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 in Plano, Illinois. Rain falls for 19.4 days and accumulates 4.88" (124mm) of precipitation.
In Plano, Illinois, snow does not fall in May through September.
With an average of 15h and 12min of daylight, June has the longest days of the year in Plano.
June and August, with an average of 9.6h of sunshine, are months with the most sunshine in Plano, Illinois.
The months with the highest UV index in Plano are June and July, with an average maximum UV index of 6.
During the warmest month in Plano, July, temperatures average a high of 80.6°F (27°C) and a low of 63.5°F (17.5°C).
July and August, with an average relative humidity of 84%, are most humid months.
October is the least humid month, with an average relative humidity of 74%.
The month with the least rainfall in Plano is November, when the rain falls for 11 days and typically collects 1.73" (44mm) of precipitation.
The month with the shortest days in Plano, Illinois, is December, with an average of 9h and 12min of daylight.
Average temperature
Plano, IL
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.2°F).
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure
Plano, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"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:
30.1"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Plano, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.7mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6mph - Average wind speed in September:
7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are January and April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Plano, IL
The months with the highest relative humidity are July and August (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Plano, IL
- Average rainfall in January:
1.85" - Average rainfall in February:
1.85" - Average rainfall in March:
2.09" - Average rainfall in April:
4.02" - Average rainfall in May:
4.88" - Average rainfall in June:
4.65"
- Average rainfall in July:
3.9" - Average rainfall in August:
3.11" - Average rainfall in September:
2.52" - Average rainfall in October:
3.03" - Average rainfall in November:
1.73" - Average rainfall in December:
1.85"
The wettest month (with the highest rainfall) is May (4.88").
The driest month (with the least rainfall) is November (1.73").
Average rainfall days
Plano, IL
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
6 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
17.9 days - Average rainfall days in May:
19.4 days - Average rainfall days in June:
19.8 days
- Average rainfall days in July:
20.3 days - Average rainfall days in August:
18.3 days - Average rainfall days in September:
14 days - Average rainfall days in October:
13.8 days - Average rainfall days in November:
11 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is July (20.3 days).
The month with the least rainy days is February (6 days).
Average snowfall
Plano, IL
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Plano, IL
- Average snowfall days in January:
13.4 days - Average snowfall days in February:
11.2 days - Average snowfall days in March:
6.6 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.2 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:
0.5 days - Average snowfall days in November:
3.2 days - Average snowfall days in December:
10.2 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Plano, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- 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 48min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 48min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 30min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 36min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 12min
The months with the most sunshine are June and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Plano, IL
- Average sunshine days in January:
13.3 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
13.1 days - Average sunshine days in April:
9.4 days - Average sunshine days in May:
9.3 days - Average sunshine days in June:
8.4 days
- Average sunshine days in July:
7.2 days - Average sunshine days in August:
9.1 days - Average sunshine days in September:
13.4 days - Average sunshine days in October:
14.7 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
14.5 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is July (7.2 days).
Average UV index
Plano, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Plano, IL
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility
Plano, IL
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
