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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, in Saint Johns, Illinois, is a wintry winter month, with an average temperature fluctuating between 38.8°F (3.8°C) and 25.7°F (-3.5°C). January, known for its average high temperature of 38.8°F (3.8°C) and an average low temperature of 25.7°F (-3.5°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a frosty month in Saint Johns, Illinois, with an average temperature fluctuating between 29.5°F (-1.4°C) and 43.7°F (6.5°C). As January transitions into February, the average high-temperature rests at a chilly 43.7°F (6.5°C), maintaining a close resemblance to the previous month. Weather in February »
Weather in March
March, the first month of the spring in Saint Johns, is a cool month, with an average temperature fluctuating between 38.7°F (3.7°C) and 55°F (12.8°C). March brings a temperature change, with average high-temperatures moving from February's chilly 43.7°F (6.5°C) to a cool 55°F (12.8°C). Weather in March »
Weather in April
April is an enjoyable spring month in Saint Johns, Illinois, with an average temperature fluctuating between 48.4°F (9.1°C) and 66°F (18.9°C). The arrival of April brings a change in Saint Johns's weather, with average high-temperatures moving from March's fresh 55°F (12.8°C) to a refreshing 66°F (18.9°C). Weather in April »
Weather in May
May, the last month of the spring in Saint Johns, is a moderately hot month, with an average temperature ranging between max 75.4°F (24.1°C) and min 58.1°F (14.5°C). Saint Johns sees a rise in temperature during May, with average high-temperatures transitioning from an enjoyable 66°F (18.9°C) in April to a warm 75.4°F (24.1°C). Weather in May »
Weather in June
The first month of the summer, June, is also a moderately hot month in Saint Johns, Illinois, with an average temperature fluctuating between 84.6°F (29.2°C) and 66.6°F (19.2°C). The beginning of June signals a rise in the average high-temperature, moving from 75.4°F (24.1°C) in May to a still warm 84.6°F (29.2°C). Weather in June »
Weather in July
July is a tropical summer month in Saint Johns, Illinois, with temperature in the range of an average high of 87.3°F (30.7°C) and an average low of 68.7°F (20.4°C). July, with an average high of 87.3°F (30.7°C) and a low of 68.7°F (20.4°C), signifies the warmest month of the year. July's heat index is estimated at a torrid 102.2°F (39°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Johns, Illinois, with temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 66°F (18.9°C). Saint Johns's shift from July to August is accompanied by an average high-temperature of a warm 85.5°F (29.7°C), a slight deviation from 87.3°F (30.7°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Saint Johns, Illinois, with an average temperature ranging between max 79.7°F (26.5°C) and min 60.1°F (15.6°C). The transition into September involves a small decrease in the average high-temperature, dipping slightly from a moderately hot 85.5°F (29.7°C) in August to a still warm 79.7°F (26.5°C). Weather in September »
Weather in October
October, like September, in Saint Johns, Illinois, is another enjoyable autumn month, with temperature in the range of an average low of 49.3°F (9.6°C) and an average high of 67.1°F (19.5°C). A decrease in the average high-temperature is observed during October, shifting from a warm 79.7°F (26.5°C) in September to an enjoyable 67.1°F (19.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Saint Johns, is another cool month, with an average temperature fluctuating between 53.6°F (12°C) and 38.3°F (3.5°C). In Saint Johns, the average high-temperature in November decreases from a comfortable 67.1°F (19.5°C) in October to a cool 53.6°F (12°C). Weather in November »
Weather in December
December, the first month of the winter in Saint Johns, is still a chilly month, with an average temperature fluctuating between 43.5°F (6.4°C) and 31.1°F (-0.5°C). During the transition into December, Saint Johns observes a decrease in the average high-temperature, falling from a cool 53.6°F (12°C) in November to a frosty 43.5°F (6.4°C). Weather in December »
[Resources]Frequently asked questions
What month is the coldest in Saint Johns?
January, with an average high of 38.8°F (3.8°C) and a low of 25.7°F (-3.5°C), signifies the coldest month of the year in Saint Johns, Illinois.
What is the driest month in Saint Johns?
The month with the least rainfall in Saint Johns, Illinois, is January, when the rain falls for 8.4 days and typically collects 1.5" (38mm) of precipitation.
How much does it rain in Saint Johns?
In Saint Johns, during the entire year, the rain falls for 147.6 days and collects up to 29.17" (741mm) of precipitation.
When does it snow in Saint Johns?
January through April, November and December are months with snowfall.
How many days does it snow in Saint Johns?
Throughout the year, in Saint Johns, Illinois, there are 18 snowfall days, and 4.53" (115mm) of snow is accumulated.
What is the month with the least sunshine in Saint Johns?
January has the least sunshine of the year, with an average of 4.6h of sunshine.
What are the months with the lowest UV index in Saint Johns?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Saint Johns.
What is the snowiest month in Saint Johns?
February is the month with the most snowfall in Saint Johns. Snow falls for 5.1 days and accumulates 1.5" (38mm) of snow.
When is Daylight Saving Time (DST) in Saint Johns?
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 in Saint Johns?
April is the month with the most rainfall in Saint Johns. Rain falls for 15.1 days and accumulates 3.58" (91mm) of precipitation.
What is the most humid month in Saint Johns?
The most humid month is May, with an average relative humidity of 79%.
When it does not snow in Saint Johns?
In Saint Johns, Illinois, snow does not fall in May through October.
When are the longest days in Saint Johns?
With an average of 14h and 48min of daylight, June has the longest days of the year.
What is the month with the highest UV index in Saint Johns?
The months with the highest UV index in Saint Johns, Illinois, are June through August, with an average maximum UV index of 6.
What month is the hottest in Saint Johns?
July is the warmest month in Saint Johns, with the temperature often reaching an average high of 87.3°F (30.7°C) and an average low of 68.7°F (20.4°C).
What month has the most sunshine in Saint Johns?
The month with the most sunshine in Saint Johns is July, with an average of 10.5h of sunshine.
What is the least humid month in Saint Johns?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days in Saint Johns?
December has the shortest days of the year in Saint Johns, with an average of 9h and 36min of daylight.
Average temperature
Saint Johns, IL
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure
Saint Johns, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Saint Johns, IL
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.3mph - Average wind speed in May:
7.8mph - Average wind speed in June:
6.7mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.3mph - Average wind speed in October:
8mph - Average wind speed in November:
8.7mph - Average wind speed in December:
8.9mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity
Saint Johns, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Saint Johns, IL
- Average rainfall in January:
1.5" - Average rainfall in February:
1.54" - Average rainfall in March:
2.56" - Average rainfall in April:
3.58" - Average rainfall in May:
3.27" - Average rainfall in June:
3.31"
- Average rainfall in July:
3.07" - Average rainfall in August:
2.8" - Average rainfall in September:
1.73" - Average rainfall in October:
2.36" - Average rainfall in November:
1.89" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days
Saint Johns, IL
- Average rainfall days in January:
8.4 days - Average rainfall days in February:
8.3 days - Average rainfall days in March:
14.4 days - Average rainfall days in April:
15.1 days - Average rainfall days in May:
17 days - Average rainfall days in June:
15.1 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
14 days - Average rainfall days in September:
11.6 days - Average rainfall days in October:
9.9 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall
Saint Johns, IL
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Saint Johns, IL
- Average snowfall days in January:
5.4 days - Average snowfall days in February:
5.1 days - Average snowfall days in March:
2.1 days - Average snowfall days in April:
0.5 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:
1.1 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Johns, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - 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:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 3min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Saint Johns, IL
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
15 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
12.4 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
12.1 days
- Average sunshine days in July:
12 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
16.7 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
19.2 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index
Saint Johns, 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
Saint Johns, IL
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility
Saint Johns, 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).
Saint Johns, Illinois, USA
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