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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 another cold winter month in Rochester, Illinois, with an average temperature varying between 21.4°F (-5.9°C) and 33.4°F (0.8°C). With average temperatures fluctuating between a high of 33.4°F (0.8°C) and a low of 21.4°F (-5.9°C), January stands out as the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Rochester, Illinois, with an average temperature varying between 38.3°F (3.5°C) and 25.2°F (-3.8°C). On the advent of February, Rochester's average high-temperature exhibits a minor adjustment to a still wintry 38.3°F (3.5°C) from January's 33.4°F (0.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Rochester, Illinois, with temperature in the range of an average high of 51.3°F (10.7°C) and an average low of 36°F (2.2°C). Rochester's weather shows a temperature rise with the arrival of March, moving from an icy 38.3°F (3.5°C) in February to a fresh 51.3°F (10.7°C). Weather in March »
Weather in April
April is a comfortable spring month in Rochester, Illinois, with an average temperature fluctuating between 46.2°F (7.9°C) and 63.1°F (17.3°C). April signals a shift in the average high-temperature, moving from March's cool 51.3°F (10.7°C) to a comfortable 63.1°F (17.3°C). Weather in April »
Weather in May
May, the last month of the spring in Rochester, is a pleasant month, with an average temperature ranging between max 72.9°F (22.7°C) and min 56.5°F (13.6°C). An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a comfortable 63.1°F (17.3°C) to an agreeable 72.9°F (22.7°C). Weather in May »
Weather in June
June, the first month of the summer in Rochester, is a warm month, with an average temperature varying between 64.6°F (18.1°C) and 81.1°F (27.3°C). June's arrival brings a slight change in high-temperatures, adjusting from a pleasant 72.9°F (22.7°C) in May to a warm 81.1°F (27.3°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Rochester, Illinois, with an average temperature varying between 66°F (18.9°C) and 82.8°F (28.2°C). July, with average temperatures reaching a high of 82.8°F (28.2°C) and a low of 66°F (18.9°C), is the warmest month. Throughout July, the 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 another warm month in Rochester, Illinois, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.9°F (27.7°C). On the advent of August, Rochester's average high-temperature exhibits a minor adjustment to a still moderately hot 81.9°F (27.7°C) from July's 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 Rochester, Illinois, with an average temperature fluctuating between 77.4°F (25.2°C) and 58.6°F (14.8°C). The arrival of September marks a slight shift to an average high-temperature of a still moderately hot 77.4°F (25.2°C) from August's 81.9°F (27.7°C). Weather in September »
Weather in October
October, like September, in Rochester, Illinois, is another refreshing autumn month, with an average temperature varying between 64.2°F (17.9°C) and 48.2°F (9°C). Stepping into October, Rochester observes a temperature decline, with the average high falling from September's moderately hot 77.4°F (25.2°C) to an enjoyable 64.2°F (17.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Rochester, is another cool month, with an average temperature varying between 36.3°F (2.4°C) and 50.2°F (10.1°C). As November commences, the average high-temperature shows a reduction, transitioning from an enjoyable 64.2°F (17.9°C) in October to a fresh 50.2°F (10.1°C). Weather in November »
Weather in December
December, the first month of the winter in Rochester, is still a cold month, with an average temperature varying between 28.2°F (-2.1°C) and 38.7°F (3.7°C). The onset of December comes with a shift in the average high-temperature, falling from a fresh 50.2°F (10.1°C) in November to an icy 38.7°F (3.7°C). Weather in December »
Updated: Jun 19, 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 time of the year is the coldest?
Rochester's coldest month, January, generally records average temperatures ranging from a high of 33.4°F (0.8°C) to a low of 21.4°F (-5.9°C).
How much does it rain?
Throughout the year, there are 141.7 rainfall days, and 22.72" (577mm) of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
How many days does it snow?
Throughout the year, there are 27.9 snowfall days, and 6.14" (156mm) of snow is accumulated.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.2h of sunshine.
When is 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 does it snow the most?
February is the month with the most snowfall. Snow falls for 7.3 days and accumulates 1.85" (47mm) of snow.
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?
April is the month with the most rainfall. Rain falls for 14.1 days and accumulates 2.64" (67mm) of precipitation.
When it does not snow?
In Rochester, snow does not fall in May through October.
When are the longest days in Rochester?
June has the longest days of the year, with an average of 14h and 54min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.4h of sunshine.
What is the month with the highest UV index in Rochester?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months?
Rochester's temperature records reveal July as the warmest month, marked by average highs of 82.8°F (28.2°C) and lows of 66°F (18.9°C).
What is the most humid month?
The most humid month is July, with an average relative humidity of 84%.
What is the least humid month?
With an average relative humidity of 70%, October is the least humid month.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 7.5 days and typically collects 1.14" (29mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year in Rochester, with an average of 9h and 24min of daylight.
Average temperature
Rochester, 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 (33.4°F).
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).
Average pressure
Rochester, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"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 (29.92"Hg).
Average wind speed
Rochester, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.1mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity
Rochester, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Rochester, IL
- Average rainfall in January:
1.38" - Average rainfall in February:
1.18" - Average rainfall in March:
1.61" - Average rainfall in April:
2.64" - Average rainfall in May:
2.6" - Average rainfall in June:
2.56"
- Average rainfall in July:
2.17" - Average rainfall in August:
2.17" - Average rainfall in September:
1.89" - Average rainfall in October:
2.05" - Average rainfall in November:
1.34" - Average rainfall in December:
1.14"
The wettest month (with the highest rainfall) is April (2.64").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days
Rochester, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.2 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
14.1 days - Average rainfall days in May:
17.7 days - Average rainfall days in June:
15.6 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
12 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (6.2 days).
Average snowfall
Rochester, IL
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Rochester, IL
- Average snowfall days in January:
8.3 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
2.9 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:
0.2 days - Average snowfall days in November:
2 days - Average snowfall days in December:
6.5 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rochester, 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:
14h and 5min
- 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: 14h and 54min).
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 3min - Average sunshine in April:
8h and 1min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 2min
- 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:
6h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Rochester, IL
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
14.5 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11 days - Average sunshine days in August:
12.8 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
18.7 days - Average sunshine days in November:
18.6 days - Average sunshine days in December:
18.1 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is July (11 days).
Average UV index
Rochester, 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
Rochester, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility
Rochester, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Rochester, Illinois, USA
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