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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 a freezing cold winter month in Raritan, Illinois, with an average temperature ranging between max 30.9°F (-0.6°C) and min 18.7°F (-7.4°C). With average temperatures fluctuating between a high of 30.9°F (-0.6°C) and a low of 18.7°F (-7.4°C), January stands out as the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Raritan, is a wintry month, with an average temperature varying between 35.8°F (2.1°C) and 22.3°F (-5.4°C). The transition into February shows a subtle variation to an icy 35.8°F (2.1°C) from January's 30.9°F (-0.6°C) in the average high-temperature. Weather in February »
Weather in March
March, the first month of the spring in Raritan, is a chilly month, with an average temperature ranging between min 34.2°F (1.2°C) and max 49.6°F (9.8°C). In March, the meteorological conditions change with the average high-temperature moving from an icy 35.8°F (2.1°C) in February to a frosty 49.6°F (9.8°C). Weather in March »
Weather in April
April is a refreshing spring month in Raritan, Illinois, with temperature in the range of an average low of 44.2°F (6.8°C) and an average high of 61.3°F (16.3°C). In Raritan, the average high-temperature in April rises, from a frosty 49.6°F (9.8°C) in March, to a refreshing 61.3°F (16.3°C). Weather in April »
Weather in May
May, the last month of the spring in Raritan, is a pleasant month, with an average temperature varying between 71.6°F (22°C) and 54.9°F (12.7°C). May's arrival coincides with a rise in the average high-temperature, moving from April's comfortable 61.3°F (16.3°C) to an agreeable 71.6°F (22°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Raritan, Illinois, with an average temperature ranging between min 63.7°F (17.6°C) and max 80.4°F (26.9°C). With the onset of June, Raritan observes a minor temperature ascent, with the average high-temperature adjusting from May's agreeable 71.6°F (22°C) to a warm 80.4°F (26.9°C). Weather in June »
Weather in July
July, like June, in Raritan, Illinois, is another warm summer month, with temperature in the range of an average low of 66.2°F (19°C) and an average high of 82.6°F (28.1°C). Raritan records the warmest temperatures in July, averaging a high of 82.6°F (28.1°C) and a low of 66.2°F (19°C). The heat index in July is computed to be a tropical 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Raritan, is also a moderately hot month, with temperature in the range of an average low of 63.7°F (17.6°C) and an average high of 82.2°F (27.9°C). The transition from July to August brings an average high-temperature of a still moderately hot 82.2°F (27.9°C), barely different from July's 82.6°F (28.1°C). Weather in August »
Weather in September
September, the first month of the autumn in Raritan, is also a moderately hot month, with an average temperature fluctuating between 57.4°F (14.1°C) and 76.8°F (24.9°C). September heralds a minor drop in average high-temperature, sliding from August's 82.2°F (27.9°C) to a still moderately hot 76.8°F (24.9°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Raritan, Illinois, with an average temperature varying between 63°F (17.2°C) and 46°F (7.8°C). October's arrival coincides with a drop in the average high-temperature, decreasing from September's warm 76.8°F (24.9°C) to a refreshing 63°F (17.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Raritan, Illinois, with an average temperature varying between 34.7°F (1.5°C) and 48.9°F (9.4°C). Transition from October to November is accompanied by a temperature drop, with average high-temperatures decreasing from a comfortable 63°F (17.2°C) to a chilly 48.9°F (9.4°C). Weather in November »
Weather in December
December, the first month of the winter in Raritan, is also a wintry month, with an average temperature ranging between min 25.5°F (-3.6°C) and max 37°F (2.8°C). December's arrival correlates with a reduction in the average high-temperature, down from a chilly 48.9°F (9.4°C) in November to an icy 37°F (2.8°C). Weather in December »
Updated: Jun 13, 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 Raritan?
The coldest month is January, with an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 18.7°F (-7.4°C).
What is the driest month?
January is the month with the least rainfall. Rain falls for 4.3 days and accumulates 0.83" (21mm) of precipitation.
How many days does it rain?
Throughout the year, there are 127.6 rainfall days, and 21.02" (534mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 8.5 days and accumulates 3.15" (80mm) of snow.
How many days does it snow?
Throughout the year, there are 26.4 snowfall days, and 9.06" (230mm) 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 is the month with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST)?
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 in Raritan is May, when the rain falls for 17.5 days and typically aggregates up to 3.11" (79mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 0min of daylight.
What are the months with the most sunshine?
June and July, with an average of 10h of sunshine, are months with the most sunshine.
What is the month with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the warmest month in Raritan?
Raritan's July weather reaches an average high of 82.6°F (28.1°C) and an average low of 66.2°F (19°C), making it the warmest month.
What is the most humid month?
July is the most humid month, with an average relative humidity of 83%.
What is the least humid month?
The least humid month in Raritan is October, with an average relative humidity of 71%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Raritan, IL
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (30.9°F).
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure
Raritan, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"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:
30.1"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Raritan, IL
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.5mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.7mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.2mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).
Average humidity
Raritan, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Raritan, IL
- Average rainfall in January:
0.83" - Average rainfall in February:
1.1" - Average rainfall in March:
1.69" - Average rainfall in April:
2.4" - Average rainfall in May:
3.11" - Average rainfall in June:
2.44"
- Average rainfall in July:
2.13" - Average rainfall in August:
1.69" - Average rainfall in September:
1.77" - Average rainfall in October:
1.46" - Average rainfall in November:
1.42" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days
Raritan, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.6 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
11.7 days - Average rainfall days in September:
10.2 days - Average rainfall days in October:
9.9 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
5.6 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).
Average snowfall
Raritan, IL
The month with the highest snowfall is January (3.15").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Raritan, IL
- Average snowfall days in January:
8.5 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
3.8 days - Average snowfall days in April:
0.7 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:
1.5 days - Average snowfall days in December:
5.4 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Raritan, 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 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 2min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Raritan, IL
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
17.6 days - Average sunshine days in March:
15.5 days - Average sunshine days in April:
15.1 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
14.4 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
18.4 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
19.3 days - Average sunshine days in December:
20 days
The month with the most sunshine days is December (20 days).
The months with the least sunshine days are May and June (11.8 days).
Average UV index
Raritan, 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
Raritan, IL
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility
Raritan, 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).
Raritan, Illinois, USA
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