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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is another subzero cold winter month in Porterfield, Illinois, with an average temperature ranging between max 29.3°F (-1.5°C) and min 17.4°F (-8.1°C). Temperature readings reach their annual highs in January, averaging 29.3°F (-1.5°C) and a minimum average of 17.4°F (-8.1°C). Weather in January »
Weather in February
February, the last month of the winter in Porterfield, is an icy month, with an average temperature varying between 21°F (-6.1°C) and 33.4°F (0.8°C). The shift from January to February is characterized by an average high-temperature of an icy 33.4°F (0.8°C), not significantly different from the 29.3°F (-1.5°C) of January. Weather in February »
Weather in March
March, the first month of the spring in Porterfield, is a chilly month, with an average temperature fluctuating between 47.7°F (8.7°C) and 33.1°F (0.6°C). The shift into March is marked by a rise in the average high-temperature, moving from February's icy 33.4°F (0.8°C) to a chilly 47.7°F (8.7°C). Weather in March »
Weather in April
April is a refreshing spring month in Porterfield, Illinois, with an average temperature fluctuating between 43°F (6.1°C) and 59.4°F (15.2°C). The arrival of April brings a temperature shift, with the average high-temperature escalating from a chilly 47.7°F (8.7°C) in March to a moderate 59.4°F (15.2°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Porterfield, Illinois, with an average temperature ranging between max 71.1°F (21.7°C) and min 54°F (12.2°C). May's arrival signals an increase in average high-temperatures, moving from April's mild 59.4°F (15.2°C) to a pleasant 71.1°F (21.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Porterfield, Illinois, with an average temperature fluctuating between 62.1°F (16.7°C) and 79°F (26.1°C). In Porterfield, the onset of June comes with a modest high-temperature shift, transitioning from May's agreeable 71.1°F (21.7°C) to a moderately hot 79°F (26.1°C). Weather in June »
Weather in July
July, like June, in Porterfield, Illinois, is a moderately hot summer month, with an average temperature varying between 81°F (27.2°C) and 64.6°F (18.1°C). In Porterfield, July records the highest average temperatures, peaking at 81°F (27.2°C) and reaching a low of 64.6°F (18.1°C). During July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Porterfield, Illinois, with an average temperature varying between 62.2°F (16.8°C) and 80.1°F (26.7°C). The arrival of August denotes a barely perceptible change in the average high-temperatures to a still warm 80.1°F (26.7°C) from July's 81°F (27.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Porterfield, Illinois, with an average temperature fluctuating between 56.5°F (13.6°C) and 75°F (23.9°C). The transition into September marks the average high-temperature at a still moderately hot 75°F (23.9°C), differing minimally from August's 80.1°F (26.7°C). Weather in September »
Weather in October
October, like September, in Porterfield, Illinois, is another comfortable autumn month, with an average temperature fluctuating between 61.7°F (16.5°C) and 46°F (7.8°C). Porterfield experiences a temperature shift at the start of October, with average high-temperatures adjusting from a moderately hot 75°F (23.9°C) in September to a refreshing 61.7°F (16.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Porterfield, Illinois, with an average temperature ranging between min 34°F (1.1°C) and max 47.3°F (8.5°C). The start of November signals a considerable reduction in the average high-temperature, receding from a comfortable 61.7°F (16.5°C) in October to a chilly 47.3°F (8.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Porterfield, Illinois, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 25.3°F (-3.7°C). Observing a mild shift, the average high-temperature during December reduces from November's chilly 47.3°F (8.5°C) to an icy 35.6°F (2°C). Weather in December »
Updated: Aug 21, 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
What are the coldest months?
In Porterfield, January is known for its average lowest temperatures, reaching a high of 29.3°F (-1.5°C) and a low of 17.4°F (-8.1°C).
What is the driest month?
The months with the least rainfall are January and December Rain falls for 6.4 days and accumulates 1.57" (40mm) of rain.
How many days does it rain?
In Porterfield, during the entire year, the rain falls for 151.3 days and collects up to 30.16" (766mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
How much does it snow?
Throughout the year, there are 36.7 snowfall days, and 14.09" (358mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 3.9h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Porterfield?
The month with the lowest UV index is January, with an average maximum UV index of 1.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 9.6 days and typically aggregates up to 3.7" (94mm) of snow.
When is Daylight Saving Time (DST) in Porterfield?
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.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 18.4 days and typically aggregates up to 4.41" (112mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What month has the most sunshine?
June has the most sunshine of the year, with an average of 10h of sunshine.
What are the months with the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What time of the year is the hottest?
Porterfield's temperatures peak on average in July, reaching 81°F (27.2°C) at their highest and 64.6°F (18.1°C) at their lowest.
What is the most humid month?
The most humid month is July, with an average relative humidity of 85%.
What is the least humid month?
October is the least humid month, with an average relative humidity of 72%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Porterfield, IL
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.3°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 (17.4°F).
Average pressure
Porterfield, 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:
29.95"Hg - Average pressure in June:
29.91"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:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Porterfield, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.2mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.3mph - Average wind speed in November:
10mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity
Porterfield, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Porterfield, IL
- Average rainfall in January:
1.57" - Average rainfall in February:
1.61" - Average rainfall in March:
2.17" - Average rainfall in April:
3.7" - Average rainfall in May:
4.41" - Average rainfall in June:
3.23"
- Average rainfall in July:
2.76" - Average rainfall in August:
2.24" - Average rainfall in September:
2.24" - Average rainfall in October:
2.91" - Average rainfall in November:
1.73" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is May (4.41").
The driest months (with the least rainfall) are January and December (1.57").
Average rainfall days
Porterfield, IL
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
5.9 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
17 days - Average rainfall days in May:
18.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
14.7 days - Average rainfall days in September:
11.7 days - Average rainfall days in October:
12.6 days - Average rainfall days in November:
9.6 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall
Porterfield, IL
The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Porterfield, IL
- Average snowfall days in January:
11.2 days - Average snowfall days in February:
9.6 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1.3 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:
0.3 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
7 days
The month with the highest number of snowfall days is January (11.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Porterfield, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - 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 January:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Porterfield, IL
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
12.8 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
10.7 days - Average sunshine days in June:
10.9 days
- Average sunshine days in July:
11 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
15.9 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
16.8 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is May (10.7 days).
Average UV index
Porterfield, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Porterfield, IL
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility
Porterfield, IL
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Porterfield, Illinois, USA
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