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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, is an icy winter month in Johnston City, Illinois, with an average temperature varying between 26.1°F (-3.3°C) and 39°F (3.9°C). Johnston City records the coldest temperatures in January, averaging a high of 39°F (3.9°C) and a low of 26.1°F (-3.3°C). Weather in January »
Weather in February
February, the last month of the winter in Johnston City, is a frosty month, with an average temperature fluctuating between 29.7°F (-1.3°C) and 43.7°F (6.5°C). With the start of February, Johnston City measures an average high-temperature of a chilly 43.7°F (6.5°C), not significantly differing from January's 39°F (3.9°C). Weather in February »
Weather in March
March, the first month of the spring in Johnston City, is a fresh month, with an average temperature fluctuating between 39.2°F (4°C) and 55.2°F (12.9°C). March brings an increase in the average high-temperature, progressing from a frosty 43.7°F (6.5°C) in February to a cool 55.2°F (12.9°C). Weather in March »
Weather in April
April is a refreshing spring month in Johnston City, Illinois, with an average temperature fluctuating between 48.7°F (9.3°C) and 66.4°F (19.1°C). The start of April brings a rise in the average high-temperature, moving from a fresh 55.2°F (12.9°C) in March to a refreshing 66.4°F (19.1°C). Weather in April »
Weather in May
May, the last month of the spring in Johnston City, is a warm month, with an average temperature ranging between max 75.6°F (24.2°C) and min 58.1°F (14.5°C). May brings an increase in the average high-temperature, progressing from a comfortable 66.4°F (19.1°C) in April to a moderately hot 75.6°F (24.2°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Johnston City, Illinois, with temperature in the range of an average low of 66.6°F (19.2°C) and an average high of 84.6°F (29.2°C). June's arrival brings a change in high-temperatures, moving from a moderately hot 75.6°F (24.2°C) in May to a still warm 84.6°F (29.2°C). Weather in June »
Weather in July
July is a hot summer month in Johnston City, Illinois, with an average temperature fluctuating between 68.5°F (20.3°C) and 87.3°F (30.7°C). In Johnston City, July is identified by the highest average temperatures, reaching a peak of 87.3°F (30.7°C) and a low of 68.5°F (20.3°C). During July, the heat index is calculated to be a very hot 102.2°F (39°C). Weather in July »
Weather in August
August, the last month of the summer in Johnston City, is also a moderately hot month, with an average temperature varying between 85.5°F (29.7°C) and 66.4°F (19.1°C). The arrival of August brings an average high-temperature of a moderately hot 85.5°F (29.7°C), nearly identical to July's 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 Johnston City, Illinois, with an average temperature varying between 60.4°F (15.8°C) and 80.1°F (26.7°C). September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's moderately hot 85.5°F (29.7°C) to a still warm 80.1°F (26.7°C). Weather in September »
Weather in October
October, like September, in Johnston City, Illinois, is another refreshing autumn month, with an average temperature varying between 67.3°F (19.6°C) and 49.6°F (9.8°C). Setting in of October comes with a decrease in the average high-temperature, moving from a moderately hot 80.1°F (26.7°C) in September to an enjoyable 67.3°F (19.6°C). Weather in October »
Weather in November
November, the last month of the autumn in Johnston City, is also a fresh month, with temperature in the range of an average low of 38.5°F (3.6°C) and an average high of 53.8°F (12.1°C). Setting in of November comes with a decrease in the average high-temperature, moving from a refreshing 67.3°F (19.6°C) in October to a fresh 53.8°F (12.1°C). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in Johnston City, Illinois, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 43.7°F (6.5°C). The shift from November to December corresponds with a decrease in the average high-temperature, down to a frosty 43.7°F (6.5°C) from a fresh 53.8°F (12.1°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
What month is the coldest in Johnston City?
January, marked by an average high-temperature of 39°F (3.9°C) and a low-temperature of 26.1°F (-3.3°C), is the coldest month.
How many days does it rain in Johnston City?
In Johnston City, Illinois, during the entire year, the rain falls for 167.2 days and collects up to 37.68" (957mm) of precipitation.
When does it snow in Johnston City?
January through April, October through December are months with snowfall in Johnston City.
How many days does it snow in Johnston City?
Throughout the year, in Johnston City, there are 19.8 snowfall days, and 6.57" (167mm) of snow is accumulated.
What is the month with the least sunshine in Johnston City?
With an average of 4.6h of sunshine, January has the least sunshine of the year in Johnston City, Illinois.
What are the months with the lowest UV index in Johnston City?
The months with the lowest UV index in Johnston City, Illinois, are January, February and December, with an average maximum UV index of 2.
What is the snowiest month in Johnston City?
The month with the most snowfall is February, when snow falls for 5.2 days and typically aggregates up to 1.93" (49mm) of snow.
When is Daylight Saving Time (DST) in Johnston City?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Johnston City, 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 Johnston City?
April is the month with the most rainfall. Rain falls for 16.6 days and accumulates 4.92" (125mm) of precipitation.
What is the most humid month in Johnston City?
With an average relative humidity of 79%, May is the most humid month in Johnston City, Illinois.
When it does not snow in Johnston City?
May through September are months without snowfall in Johnston City, Illinois.
When is the highest UV index in Johnston City?
The months with the highest UV index in Johnston City, Illinois, are May through August, with an average maximum UV index of 6.
When are the longest days in Johnston City?
The month with the longest days is June, with an average of 14h and 42min of daylight.
What is the month with the most sunshine in Johnston City?
The months with the most sunshine are June and July, with an average of 10.5h of sunshine.
What is the hottest time of year in Johnston City?
In Johnston City, July is the month with the highest recorded average temperatures, measuring a high of 87.3°F (30.7°C) and a low of 68.5°F (20.3°C).
What is the driest month in Johnston City?
September is the month with the least rainfall. Rain falls for 13.4 days and accumulates 1.97" (50mm) of precipitation.
What is the least humid month in Johnston City?
With an average relative humidity of 70%, October is the least humid month in Johnston City, Illinois.
What is the month with the shortest days in Johnston City?
With an average of 9h and 36min of daylight, December has the shortest days of the year in Johnston City, Illinois.
Average temperature
Johnston City, 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 (39°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure
Johnston City, 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:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.94"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 (29.94"Hg).
Average wind speed
Johnston City, IL
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.4mph - Average wind speed in May:
7.9mph - Average wind speed in June:
6.8mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.5mph - Average wind speed in October:
8.2mph - Average wind speed in November:
8.8mph - 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
Johnston City, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Johnston City, IL
- Average rainfall in January:
2.4" - Average rainfall in February:
2.6" - Average rainfall in March:
3.27" - Average rainfall in April:
4.92" - Average rainfall in May:
4.25" - Average rainfall in June:
3.74"
- Average rainfall in July:
3.31" - Average rainfall in August:
3.15" - Average rainfall in September:
1.97" - Average rainfall in October:
2.87" - Average rainfall in November:
2.64" - Average rainfall in December:
2.56"
The wettest month (with the highest rainfall) is April (4.92").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days
Johnston City, IL
- Average rainfall days in January:
9.7 days - Average rainfall days in February:
10.6 days - Average rainfall days in March:
15.8 days - Average rainfall days in April:
16.6 days - Average rainfall days in May:
18.5 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
15.7 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
11.5 days - Average rainfall days in November:
10.3 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (9.7 days).
Average snowfall
Johnston City, IL
The month with the highest snowfall is February (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Johnston City, IL
- Average snowfall days in January:
6.1 days - Average snowfall days in February:
5.2 days - Average snowfall days in March:
2.5 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:
0.2 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
4.1 days
The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Johnston City, 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 4min
- 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 42min).
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 4min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 3min
- 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 3min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Johnston City, IL
- Average sunshine days in January:
16.1 days - Average sunshine days in February:
12.5 days - Average sunshine days in March:
12.8 days - Average sunshine days in April:
11.4 days - Average sunshine days in May:
10 days - Average sunshine days in June:
9.9 days
- Average sunshine days in July:
10.6 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
14.9 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
17 days
The month with the most sunshine days is October (17.6 days).
The month with the least sunshine days is June (9.9 days).
Average UV index
Johnston City, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Johnston City, IL
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility
Johnston City, 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).
Johnston City, Illinois, USA
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