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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 Harvey, Illinois, with an average temperature fluctuating between 29.7°F (-1.3°C) and 18.9°F (-7.3°C). The coldest time of the year is January, with temperatures averaging a high of 29.7°F (-1.3°C) and a low of 18.9°F (-7.3°C). Weather in January »
Weather in February
The last month of the winter, February, is an icy month in Harvey, Illinois, with an average temperature fluctuating between 33.1°F (0.6°C) and 21.2°F (-6°C). Harvey observes a minor difference in average high-temperatures between January's 29.7°F (-1.3°C) and February's 33.1°F (0.6°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Harvey, Illinois, with an average temperature fluctuating between 32.4°F (0.2°C) and 45.5°F (7.5°C). Observing a rise in March, the average high-temperature goes from February's icy 33.1°F (0.6°C) to a chilly 45.5°F (7.5°C). Weather in March »
Weather in April
April in Harvey, Illinois, is a moderate spring month, with an average temperature varying between 56.7°F (13.7°C) and 41.7°F (5.4°C). Noticing a change, the average high-temperature during April moves from March's chilly 45.5°F (7.5°C) to a refreshing 56.7°F (13.7°C). Weather in April »
Weather in May
May, the last month of the spring in Harvey, is a pleasant month, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 68.7°F (20.4°C). The start of May is characterized by an increase in the average high-temperature, transitioning from a refreshing 56.7°F (13.7°C) in April to a pleasant 68.7°F (20.4°C). Weather in May »
Weather in June
June, the first month of the summer in Harvey, is a warm month, with an average temperature fluctuating between 77.7°F (25.4°C) and 61.7°F (16.5°C). The onset of June brings a temperature shift, with the average high-temperature moving from an agreeable 68.7°F (20.4°C) in May to a moderately hot 77.7°F (25.4°C). Weather in June »
Weather in July
July, like June, in Harvey, Illinois, is another warm summer month, with an average temperature fluctuating between 65.8°F (18.8°C) and 81.3°F (27.4°C). Harvey experiences its highest average temperatures in July, reaching a peak of 81.3°F (27.4°C) and a minimum of 65.8°F (18.8°C). July's mean heat index is estimated at a hot 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Harvey, Illinois, with an average temperature varying between 80.1°F (26.7°C) and 64.6°F (18.1°C). With the onset of August, the average high-temperature registers at a still moderately hot 80.1°F (26.7°C), subtly different from July's 81.3°F (27.4°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Harvey, Illinois, with an average temperature ranging between max 73.9°F (23.3°C) and min 58.3°F (14.6°C). Start of September brings a slight shift in the average high-temperature, dipping a bit from August's warm 80.1°F (26.7°C) to a still moderately hot 73.9°F (23.3°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Harvey, Illinois, with an average temperature fluctuating between 46.9°F (8.3°C) and 61.2°F (16.2°C). The commencement of October involves a temperature shift, with the average high-temperature dropping from a moderately hot 73.9°F (23.3°C) in September to an enjoyable 61.2°F (16.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Harvey, Illinois, with an average temperature varying between 46.9°F (8.3°C) and 34.9°F (1.6°C). Setting in of November comes with a decrease in the average high-temperature, moving from an enjoyable 61.2°F (16.2°C) in October to a frosty 46.9°F (8.3°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Harvey, Illinois, with an average temperature varying between 35.6°F (2°C) and 25.9°F (-3.4°C). December shows a mild decline in the average high-temperature, falling from November's frosty 46.9°F (8.3°C) to a wintry 35.6°F (2°C). Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Harvey?
January is the month that records the lowest temperatures in Harvey, with averages ranging from a high of 29.7°F (-1.3°C) to a low of 18.9°F (-7.3°C).
What are the most humid months in Harvey?
January and February, with an average relative humidity of 82%, are most humid months.
How much does it rain in Harvey?
In Harvey, Illinois, during the entire year, the rain falls for 155.6 days and collects up to 31.3" (795mm) of precipitation.
When does it snow in Harvey?
Months with snowfall are January through April, October through December.
What is the snowiest month in Harvey?
January is the month with the most snowfall. Snow falls for 12.6 days and accumulates 4.53" (115mm) of snow.
How much does it snow in Harvey?
In Harvey, during the entire year, snow falls for 44.6 days and aggregates up to 16.46" (418mm) of snow.
What is the month with the least sunshine in Harvey?
January has the least sunshine of the year, with an average of 3.6h of sunshine.
When is Daylight Saving Time (DST) in Harvey?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harvey, 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 wettest month in Harvey?
The month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 4.17" (106mm) of precipitation.
When it does not snow in Harvey?
In Harvey, Illinois, snow does not fall in May through September.
When are the longest days in Harvey?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What are the months with the highest UV index in Harvey?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What are the warmest months in Harvey?
July is the month when Harvey, Illinois, sees the average highest temperatures, with a high of 81.3°F (27.4°C) and a low of 65.8°F (18.8°C).
What month has the most sunshine in Harvey?
The month with the most sunshine in Harvey is August, with an average of 10.1h of sunshine.
What is the least humid month in Harvey?
The least humid month in Harvey, Illinois, is October, with an average relative humidity of 73%.
What is the driest month in Harvey?
The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.
What is the month with the shortest days in Harvey?
The month with the shortest days in Harvey, Illinois, is December, with an average of 9h and 12min of daylight.
What is the month with the lowest UV index in Harvey?
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Harvey, IL
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Harvey, IL
- Average pressure in January:
30.11"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 (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Harvey, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - 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:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Harvey, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Harvey, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.69" - Average rainfall in March:
2.09" - Average rainfall in April:
3.43" - Average rainfall in May:
4.17" - Average rainfall in June:
3.82"
- Average rainfall in July:
3.31" - Average rainfall in August:
2.56" - Average rainfall in September:
2.48" - Average rainfall in October:
2.76" - Average rainfall in November:
1.69" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days
Harvey, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall
Harvey, IL
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Harvey, IL
- Average snowfall days in January:
12.6 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.9 days - Average snowfall days in May:
0.1 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:
4 days - Average snowfall days in December:
9.1 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Harvey, 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 1min
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 12min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Harvey, IL
- Average sunshine days in January:
13 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.4 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
15 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).
Average UV index
Harvey, 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
Harvey, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Harvey, IL
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Harvey, Illinois, USA
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