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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 Plymouth, Illinois, is a freezing cold winter month, with an average temperature fluctuating between 31.1°F (-0.5°C) and 19°F (-7.2°C). January is the coldest month of the year, registering average temperatures as high as 31.1°F (-0.5°C) and as low as 19°F (-7.2°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Plymouth, Illinois, with an average temperature varying between 36.1°F (2.3°C) and 22.5°F (-5.3°C). The shift from January to February is characterized by an average high-temperature of an icy 36.1°F (2.3°C), not significantly different from the 31.1°F (-0.5°C) of January. Weather in February »
Weather in March
March, the first month of the spring in Plymouth, is a frosty month, with an average temperature ranging between min 34.3°F (1.3°C) and max 49.6°F (9.8°C). The beginning of March signals a rise in the average high-temperature, moving from an icy 36.1°F (2.3°C) in February to a chilly 49.6°F (9.8°C). Weather in March »
Weather in April
April in Plymouth, Illinois, is a comfortable spring month, with an average temperature fluctuating between 44.2°F (6.8°C) and 61.3°F (16.3°C). The arrival of April brings an increase in high-temperatures, moving 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
The last month of the spring, May, is an agreeable month in Plymouth, Illinois, with temperature in the range of an average low of 54.9°F (12.7°C) and an average high of 71.6°F (22°C). The start of May is characterized by an increase in the average high-temperature, transitioning from a comfortable 61.3°F (16.3°C) in April to an agreeable 71.6°F (22°C). Weather in May »
Weather in June
June, the first month of the summer in Plymouth, is a warm month, with an average temperature fluctuating between 63.7°F (17.6°C) and 80.4°F (26.9°C). The start of June signals a slight increase in the average high-temperature, moving from an agreeable 71.6°F (22°C) in May to a moderately hot 80.4°F (26.9°C). Weather in June »
Weather in July
July, like June, in Plymouth, Illinois, is another warm summer month, with an average temperature varying between 82.6°F (28.1°C) and 66.2°F (19°C). Plymouth's warmest weather arrives in July, when temperatures average a high of 82.6°F (28.1°C) and a low of 66.2°F (19°C). July's heat index is calculated to be a hot 91.4°F (33°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Plymouth, Illinois, with an average temperature ranging between max 82°F (27.8°C) and min 63.7°F (17.6°C). During August, Plymouth records an average high-temperature of a still warm 82°F (27.8°C), marking a slight divergence from July's 82.6°F (28.1°C). Weather in August »
Weather in September
September, the first month of the autumn in Plymouth, is still a warm month, with an average temperature ranging between min 57.6°F (14.2°C) and max 76.8°F (24.9°C). Plymouth marks the onset of September with an average high-temperature of a still moderately hot 76.8°F (24.9°C), a subtle shift from August's 82°F (27.8°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Plymouth, Illinois, with temperature in the range of an average high of 63°F (17.2°C) and an average low of 46°F (7.8°C). Plymouth's October weather shows a moderate shift in high-temperatures, falling from September's moderately hot 76.8°F (24.9°C) to a refreshing 63°F (17.2°C). Weather in October »
Weather in November
November, the last month of the autumn in Plymouth, is also a frosty month, with temperature in the range of an average high of 49.1°F (9.5°C) and an average low of 34.7°F (1.5°C). November is characterized by a reduction in the average high-temperature, from an enjoyable 63°F (17.2°C) in October to a chilly 49.1°F (9.5°C). Weather in November »
Weather in December
December, the first month of the winter in Plymouth, is still a cold month, with an average temperature fluctuating between 25.9°F (-3.4°C) and 37°F (2.8°C). As Plymouth enters December, the average high-temperature decreases from the a chilly 49.1°F (9.5°C) of November to a wintry 37°F (2.8°C). Weather in December »
Updated: Aug 6, 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 is the coldest time of year?
The lowest temperatures are recorded in January, with averages reaching a high of 31.1°F (-0.5°C) and a low of 19°F (-7.2°C).
How many days does it rain?
Throughout the year, there are 94.4 rainfall days, and 7.76" (197mm) 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 6.3 days and accumulates 0.67" (17mm) of snow.
How many days does it snow?
In Plymouth, during the entire year, snow falls for 20.5 days and aggregates up to 2.44" (62mm) of snow.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.1h of sunshine.
When is the lowest UV index?
The month with the lowest UV index is January, with an average maximum UV index of 1.
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 wettest month?
May is the month with the most rainfall in Plymouth. Rain falls for 12.3 days and accumulates 1.1" (28mm) 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 is the month with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.2h of sunshine.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What time of the year is the hottest?
In Plymouth, the peak temperatures are generally noted in July, averaging a high of 82.6°F (28.1°C) and a low of 66.2°F (19°C).
What is the most humid month?
The most humid month in Plymouth is July, with an average relative humidity of 83%.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the driest month?
The month with the least rainfall in Plymouth, Illinois, is December, when the rain falls for 4.3 days and typically collects 0.35" (9mm) of precipitation.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Plymouth, 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 (31.1°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 (19°F).
Average pressure
Plymouth, 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:
30.11"Hg - Average pressure in December:
30.12"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
Plymouth, IL
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.2mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Plymouth, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Plymouth, IL
- Average rainfall in January:
0.39" - Average rainfall in February:
0.39" - Average rainfall in March:
0.59" - Average rainfall in April:
0.79" - Average rainfall in May:
1.1" - Average rainfall in June:
0.83"
- Average rainfall in July:
0.67" - Average rainfall in August:
0.59" - Average rainfall in September:
0.87" - Average rainfall in October:
0.71" - Average rainfall in November:
0.47" - Average rainfall in December:
0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days
Plymouth, IL
- Average rainfall days in January:
3.3 days - Average rainfall days in February:
3.6 days - Average rainfall days in March:
8.7 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
12.3 days - Average rainfall days in June:
11.8 days
- Average rainfall days in July:
10 days - Average rainfall days in August:
8.9 days - Average rainfall days in September:
7.7 days - Average rainfall days in October:
7.5 days - Average rainfall days in November:
5.4 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (3.3 days).
Average snowfall
Plymouth, IL
The month with the highest snowfall is January (0.67").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Plymouth, IL
- Average snowfall days in January:
6.3 days - Average snowfall days in February:
5.7 days - Average snowfall days in March:
2.3 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:
3.7 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Plymouth, 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:
10h and 0min - 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 24min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 4min - 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:
10h and 1min - 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 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Plymouth, IL
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
20.5 days - Average sunshine days in March:
19.8 days - Average sunshine days in April:
17.5 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
13.9 days
- Average sunshine days in July:
15.3 days - Average sunshine days in August:
18.2 days - Average sunshine days in September:
20.4 days - Average sunshine days in October:
20.7 days - Average sunshine days in November:
21.8 days - Average sunshine days in December:
23.5 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is June (13.9 days).
Average UV index
Plymouth, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Plymouth, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Plymouth, 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).
Plymouth, Illinois, USA
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