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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, the same as December, in Smithfield, Illinois, is a freezing cold winter month, with an average temperature varying between 31.5°F (-0.3°C) and 19.4°F (-7°C). January, noted for its average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 19.4°F (-7°C), is considered the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Smithfield, is a wintry month, with an average temperature fluctuating between 36.3°F (2.4°C) and 23°F (-5°C). At the start of February, Smithfield's average high-temperature reaches a cold 36.3°F (2.4°C), subtly different from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Smithfield, Illinois, with temperature in the range of an average low of 34.3°F (1.3°C) and an average high of 49.6°F (9.8°C). March's arrival brings a temperature shift, moving from a cold 36.3°F (2.4°C) in February to a chilly 49.6°F (9.8°C). Weather in March »
Weather in April
April is an enjoyable spring month in Smithfield, Illinois, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 44.2°F (6.8°C). As April begins, there is an increase in the average high-temperature, moving from a frosty 49.6°F (9.8°C) in March to a comfortable 61.3°F (16.3°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Smithfield, Illinois, with an average temperature varying between 55°F (12.8°C) and 72°F (22.2°C). May's arrival brings a temperature shift, moving from an enjoyable 61.3°F (16.3°C) in April to an agreeable 72°F (22.2°C). Weather in May »
Weather in June
June, the first month of the summer in Smithfield, is a moderately hot month, with an average temperature ranging between min 63.7°F (17.6°C) and max 80.8°F (27.1°C). Smithfield's weather in June shows a minor rise in the average high-temperature, moving slightly up from May's pleasant 72°F (22.2°C) to a warm 80.8°F (27.1°C). Weather in June »
Weather in July
July, like June, in Smithfield, Illinois, is a moderately hot summer month, with temperature in the range of an average high of 82.8°F (28.2°C) and an average low of 65.8°F (18.8°C). The warmest month is July, with an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 65.8°F (18.8°C). The heat index for July is calculated to be a hot 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Smithfield, is also a moderately hot month, with an average temperature ranging between max 82°F (27.8°C) and min 63.7°F (17.6°C). The transition from July to August sees average high-temperatures adjusting to a still warm 82°F (27.8°C), from a not significantly different 82.8°F (28.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Smithfield, Illinois, with an average temperature varying between 57.6°F (14.2°C) and 76.6°F (24.8°C). The arrival of September corresponds with a light shift in temperature, down from a warm 82°F (27.8°C) in August to a still moderately hot 76.6°F (24.8°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Smithfield, Illinois, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 63°F (17.2°C). October brings a decrease in the average high-temperature, shifting from a warm 76.6°F (24.8°C) in September to an enjoyable 63°F (17.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Smithfield, Illinois, with an average temperature fluctuating between 35.1°F (1.7°C) and 49.1°F (9.5°C). During the transition into November, Smithfield observes a decrease in the average high-temperature, falling from a comfortable 63°F (17.2°C) in October to a frosty 49.1°F (9.5°C). Weather in November »
Weather in December
December, the first month of the winter in Smithfield, is also a wintry month, with an average temperature varying between 37°F (2.8°C) and 26.4°F (-3.1°C). A moderate decline in the average high-temperature is seen during December, decreasing from a frosty 49.1°F (9.5°C) in November to a wintry 37°F (2.8°C). Weather in December »
Updated: Jul 15, 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 part of the year is the coldest?
January, with its high-temperature average of 31.5°F (-0.3°C) and a low-temperature average of 19.4°F (-7°C), is the coldest month.
How many days does it rain?
Throughout the year, there are 131.7 rainfall days, and 22.48" (571mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 9.4 days and accumulates 3.35" (85mm) of snow.
How many days does it snow?
Throughout the year, there are 27.4 snowfall days, and 9.21" (234mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.1h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Smithfield?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Smithfield, 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?
May is the month with the most rainfall. Rain falls for 16.7 days and accumulates 3.23" (82mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
With an average of 15h and 0min of daylight, June has the longest days of the year.
What are the months with the most sunshine?
June and July, with an average of 10.1h of sunshine, are months with the most sunshine.
When is the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Smithfield.
What time of the year is the hottest?
The warmest period tends to be July, when average temperatures fluctuate between a high of 82.8°F (28.2°C) and a low of 65.8°F (18.8°C).
What is the most humid month in Smithfield?
With an average relative humidity of 83%, July is the most humid month in Smithfield.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the driest month?
December is the month with the least rainfall. Rain falls for 6.5 days and accumulates 0.94" (24mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
Average temperature
Smithfield, IL
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°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 (19.4°F).
Average pressure
Smithfield, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Smithfield, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity
Smithfield, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Smithfield, IL
- Average rainfall in January:
1.02" - Average rainfall in February:
1.1" - Average rainfall in March:
1.65" - Average rainfall in April:
2.6" - Average rainfall in May:
3.23" - Average rainfall in June:
2.68"
- Average rainfall in July:
2.17" - Average rainfall in August:
1.89" - Average rainfall in September:
2.09" - Average rainfall in October:
1.89" - Average rainfall in November:
1.22" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").
Average rainfall days
Smithfield, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
4.7 days - Average rainfall days in March:
11.9 days - Average rainfall days in April:
13.7 days - Average rainfall days in May:
16.7 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
11 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
7.1 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).
Average snowfall
Smithfield, IL
The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Smithfield, IL
- Average snowfall days in January:
9.4 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
1 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:
0.1 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
5 days
The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Smithfield, 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 2min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - 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 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 1min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Smithfield, IL
- Average sunshine days in January:
17.9 days - Average sunshine days in February:
17 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
14.6 days - Average sunshine days in May:
12.5 days - Average sunshine days in June:
11.1 days
- Average sunshine days in July:
11.7 days - Average sunshine days in August:
14.6 days - Average sunshine days in September:
17.1 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
20 days - Average sunshine days in December:
20.4 days
The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index
Smithfield, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Smithfield, IL
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility
Smithfield, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Smithfield, Illinois, USA
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