Yearly & Monthly weather

Climate and monthly weather forecast

Weather in January

January, the same as December, is another cold winter month in Brighton, Illinois, with an average temperature ranging between min -5.2°C and max 2.1°C. Brighton's temperature records reveal January as the coldest month, marked by average highs of 2.1°C and lows of -5.2°C. Weather in January »

Weather in February

February, the last month of the winter in Brighton, is also an icy month, with an average temperature fluctuating between 4.8°C and -3.1°C. In February, the average high-temperature registers at a still wintry 4.8°C, nearly identical to January's 2.1°C. Weather in February »

Weather in March

March, the first month of the spring in Brighton, is a fresh month, with an average temperature ranging between max 11.3°C and min 2.8°C. With the onset of March, Brighton's average high-temperature experiences a rise, moving from February's cold 4.8°C to a fresh 11.3°C. Weather in March »

Weather in April

April is a refreshing spring month in Brighton, Illinois, with an average temperature fluctuating between 17.8°C and 8.2°C. The transition from March to April brings a temperature rise, with average high-temperatures increasing from a fresh 11.3°C to a comfortable 17.8°C. Weather in April »

Weather in May

May, the last month of the spring in Brighton, is a moderately hot month, with an average temperature fluctuating between 13.8°C and 23.3°C. In Brighton, the onset of May comes with an increased average high-temperature, moving from April's refreshing 17.8°C to a warm 23.3°C. Weather in May »

Weather in June

June, the first month of the summer in Brighton, is also a moderately hot month, with temperature in the range of an average high of 28.1°C and an average low of 18.7°C. June witnesses a minor rise in the average high-temperature, transitioning from a moderately hot 23.3°C in May to a still warm 28.1°C. Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Brighton, Illinois, with an average temperature fluctuating between 19.7°C and 29.2°C. July is the warmest month, with the temperature often reaching an average high of 29.2°C and an average low of 19.7°C. The heat index value during July is computed to be a torrid 36°C. Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Brighton, Illinois, with an average temperature ranging between max 28.5°C and min 18.6°C. In August, the average high-temperature registers at a still moderately hot 28.5°C, nearly identical to July's 29.2°C. Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Brighton, Illinois, with an average temperature ranging between min 15.2°C and max 25.7°C. Brighton sees the arrival of September with an average high-temperature of a still moderately hot 25.7°C, indicating a subtle variation from August. Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Brighton, Illinois, with an average temperature fluctuating between 18.5°C and 9°C. October suggests a modest reduction in the average high-temperature, shifting from a moderately hot 25.7°C in September to a comfortable 18.5°C. Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Brighton, Illinois, with an average temperature ranging between max 10.9°C and min 2.6°C. The onset of November comes with a shift in the average high-temperature, falling from an enjoyable 18.5°C in October to a cool 10.9°C. Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Brighton, Illinois, with temperature in the range of an average low of -1.5°C and an average high of 4.8°C. In Brighton, entering December brings a temperature decrement, reducing from November's fresh 10.9°C to an icy 4.8°C. Weather in December »

Updated: Jun 5, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

In Brighton, the average lowest temperatures are observed in January, with a high of 2.1°C and a low of -5.2°C.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 6.5 days and typically collects 37mm of precipitation.

How many days does it rain?

In Brighton, during the entire year, the rain falls for 141.9 days and collects up to 695mm of precipitation.

When does it snow?

Months with snowfall are January through March, November and December.

How many days does it snow?

Throughout the year, there are 19.8 snowfall days, and 201mm of snow is accumulated.

What is the month with the least sunshine?

With an average of 4.4h of sunshine, January has the least sunshine of the year.

When is the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

When does it snow the most?

February is the month with the most snowfall. Snow falls for 5.9 days and accumulates 63mm of snow.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Brighton, 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.

When it does not snow?

In Brighton, Illinois, snow does not fall in April through October.

What is the month with the highest UV index?

May through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the wettest month?

June is the month with the most rainfall. Rain falls for 15.6 days and accumulates 85mm of precipitation.

When are the longest days in Brighton?

With an average of 14h and 54min of daylight, June has the longest days of the year.

What month has the most sunshine?

June has the most sunshine of the year in Brighton, with an average of 10.3h of sunshine.

What is the warmest month?

July, characterized by an average high temperature of 29.2°C and a low temperature of 19.7°C, is generally the warmest month.

What is the most humid month?

July is the most humid month in Brighton, with an average relative humidity of 81%.

What is the least humid month?

The least humid month is October, with an average relative humidity of 71%.

What is the month with the shortest days?

December has the shortest days of the year in Brighton, with an average of 9h and 30min of daylight.

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Year J F M A M J J A S O N D

Average temperature
Brighton, IL

Average high temperature in January:
2.1°C
Average high temperature in February:
4.8°C
Average high temperature in March:
11.3°C
Average high temperature in April:
17.8°C
Average high temperature in May:
23.3°C
Average high temperature in June:
28.1°C

Average high temperature in July:
29.2°C
Average high temperature in August:
28.5°C
Average high temperature in September:
25.7°C
Average high temperature in October:
18.5°C
Average high temperature in November:
10.9°C
Average high temperature in December:
4.8°C

The warmest month (with the highest average high temperature) is July (29.2°C).
The month with the lowest average high temperature is January (2.1°C).

Average low temperature in January:
-5.2°C
Average low temperature in February:
-3.1°C
Average low temperature in March:
2.8°C
Average low temperature in April:
8.2°C
Average low temperature in May:
13.8°C
Average low temperature in June:
18.7°C

Average low temperature in July:
19.7°C
Average low temperature in August:
18.6°C
Average low temperature in September:
15.2°C
Average low temperature in October:
9°C
Average low temperature in November:
2.6°C
Average low temperature in December:
-1.5°C

The month with the highest average low temperature is July (19.7°C).
The coldest month (with the lowest average low temperature) is January (-5.2°C).

Average pressure
Brighton, IL

Average pressure in July:
1014.8mbar
Average pressure in August:
1015mbar
Average pressure in September:
1016.7mbar
Average pressure in October:
1016.9mbar
Average pressure in November:
1020mbar
Average pressure in December:
1020.3mbar

The month with the highest atmospheric pressure is January (1021.1mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).

Average wind speed
Brighton, IL

Average wind speed in January:
15.8km/h
Average wind speed in February:
15.6km/h
Average wind speed in March:
15.3km/h
Average wind speed in April:
15.3km/h
Average wind speed in May:
12.4km/h
Average wind speed in June:
10.9km/h

Average wind speed in July:
9.3km/h
Average wind speed in August:
9.4km/h
Average wind speed in September:
10.3km/h
Average wind speed in October:
13.4km/h
Average wind speed in November:
14.6km/h
Average wind speed in December:
14.7km/h

The windiest month (with the highest average wind speed) is January (15.8km/h).
The calmest month (with the lowest average wind speed) is July (9.3km/h).

Average humidity
Brighton, IL

The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall
Brighton, IL

The wettest month (with the highest rainfall) is June (85mm).
The driest month (with the least rainfall) is January (37mm).

Average rainfall days
Brighton, IL

Average rainfall days in January:
6.5 days
Average rainfall days in February:
7.2 days
Average rainfall days in March:
13.2 days
Average rainfall days in April:
14.5 days
Average rainfall days in May:
16.7 days
Average rainfall days in June:
15.6 days

Average rainfall days in July:
16.3 days
Average rainfall days in August:
12.8 days
Average rainfall days in September:
11.5 days
Average rainfall days in October:
10.4 days
Average rainfall days in November:
9.1 days
Average rainfall days in December:
8.1 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (6.5 days).

Average snowfall
Brighton, IL

The month with the highest snowfall is February (63mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days
Brighton, IL

Average snowfall days in January:
6.2 days
Average snowfall days in February:
5.9 days
Average snowfall days in March:
2.3 days
Average snowfall days in April:
0.1 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:
1.3 days
Average snowfall days in December:
3.9 days

The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Brighton, 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 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 1min
Average daylight in December:
9h and 3min

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 30min).

Average sunshine in January:
4h and 2min
Average sunshine in February:
4h and 3min
Average sunshine in March:
6h and 2min
Average sunshine in April:
8h and 2min
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:
10h and 0min
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 5min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days
Brighton, IL

Average sunshine days in January:
19.5 days
Average sunshine days in February:
16.4 days
Average sunshine days in March:
15.3 days
Average sunshine days in April:
14 days
Average sunshine days in May:
12.2 days
Average sunshine days in June:
12.3 days

Average sunshine days in July:
12.1 days
Average sunshine days in August:
14.5 days
Average sunshine days in September:
16.7 days
Average sunshine days in October:
19.3 days
Average sunshine days in November:
18.8 days
Average sunshine days in December:
19.3 days

The month with the most sunshine days is January (19.5 days).
The month with the least sunshine days is July (12.1 days).

Average UV index
Brighton, 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, November and December (UV index 2).

Average cloud cover
Brighton, IL

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are August and September (Cloud cover 29).

Average visibility
Brighton, IL

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

°Celsius °Fahrenheit

Climate and monthly weather forecastBrighton, IL

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