Expand
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 another subzero cold winter month in Boulder Hill, Illinois, with temperature in the range of an average high of 28.4°F (-2°C) and an average low of 16.7°F (-8.5°C). January, with average temperatures reaching a high of 28.4°F (-2°C) and a low of 16.7°F (-8.5°C), is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Boulder Hill, is an icy month, with an average temperature ranging between max 32.5°F (0.3°C) and min 19.8°F (-6.8°C). Entering February, Boulder Hill's average high-temperature reads a cold 32.5°F (0.3°C), indicating a close resemblance to the previous month's climate. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Boulder Hill, Illinois, with an average temperature fluctuating between 45.7°F (7.6°C) and 31.5°F (-0.3°C). As March sets, the average high-temperature shows an increase, moving up from a wintry 32.5°F (0.3°C) in February to a frosty 45.7°F (7.6°C). Weather in March »
Weather in April
April is a refreshing spring month in Boulder Hill, Illinois, with temperature in the range of an average low of 40.8°F (4.9°C) and an average high of 57°F (13.9°C). Boulder Hill's transition into April is marked by a rise in the average high-temperature, advancing from a chilly 45.7°F (7.6°C) in March to a mild 57°F (13.9°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Boulder Hill, Illinois, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 52.3°F (11.3°C). Boulder Hill in May sees a temperature change, with average high-temperatures moving from a mild 57°F (13.9°C) in April to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Boulder Hill, Illinois, with an average temperature ranging between max 78.4°F (25.8°C) and min 60.8°F (16°C). The onset of June brings a rise in the average high-temperature, elevating from a pleasant 69.4°F (20.8°C) in May to a moderately hot 78.4°F (25.8°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Boulder Hill, Illinois, with an average temperature ranging between max 81.1°F (27.3°C) and min 64.2°F (17.9°C). With average high and low temperatures of 81.1°F (27.3°C) and 64.2°F (17.9°C) respectively, July is Boulder Hill's warmest month. The average heat index in July is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Boulder Hill, is also a moderately hot month, with an average temperature varying between 79.3°F (26.3°C) and 62.4°F (16.9°C). August brings an average high-temperature of a still warm 79.3°F (26.3°C), showing a slight difference from July's 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Boulder Hill, Illinois, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 74.1°F (23.4°C). The average high-temperature during September is a still warm 74.1°F (23.4°C), almost matching the conditions of the preceding month. Weather in September »
Weather in October
October, like September, in Boulder Hill, Illinois, is another enjoyable autumn month, with temperature in the range of an average high of 60.8°F (16°C) and an average low of 45.1°F (7.3°C). October's onset brings a reduction in the average high-temperature, from a warm 74.1°F (23.4°C) in September to a refreshing 60.8°F (16°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Boulder Hill, Illinois, with an average temperature fluctuating between 33.3°F (0.7°C) and 46°F (7.8°C). November's arrival is marked by a notable drop in high-temperatures, falling from an enjoyable 60.8°F (16°C) in October to a frosty 46°F (7.8°C). Weather in November »
Weather in December
December, the first month of the winter in Boulder Hill, is also a wintry month, with an average temperature fluctuating between 24.1°F (-4.4°C) and 34.5°F (1.4°C). December suggests a modest reduction in the average high-temperature, shifting from a frosty 46°F (7.8°C) in November to a wintry 34.5°F (1.4°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 is the coldest month in Boulder Hill?
Boulder Hill, Illinois, reaches its average lowest temperatures in January, measuring 28.4°F (-2°C) at the peak and 16.7°F (-8.5°C) at the lowest.
What is the most humid month in Boulder Hill?
The months with the highest humidity in Boulder Hill are January, February, July and August, with an average relative humidity of 83%.
How much does it rain in Boulder Hill?
In Boulder Hill, during the entire year, the rain falls for 133.1 days and collects up to 16.93" (430mm) of precipitation.
When does it snow in Boulder Hill?
Months with snowfall in Boulder Hill, Illinois, are January through April, October through December.
What is the snowiest month in Boulder Hill?
The month with the most snowfall in Boulder Hill, Illinois, is January, when snow falls for 10.7 days and typically aggregates up to 1.73" (44mm) of snow.
How much does it snow in Boulder Hill?
In Boulder Hill, Illinois, during the entire year, snow falls for 39.5 days and aggregates up to 6.69" (170mm) of snow.
What is the month with the least sunshine in Boulder Hill?
January has the least sunshine of the year in Boulder Hill, Illinois, with an average of 3.8h of sunshine.
What are the months with the lowest UV index in Boulder Hill?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Boulder Hill?
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.
When it does not snow in Boulder Hill?
In Boulder Hill, Illinois, snow does not fall in May through September.
What is the wettest month in Boulder Hill?
The month with the most rainfall is June, when the rain falls for 14.9 days and typically aggregates up to 2.24" (57mm) of precipitation.
When are the longest days in Boulder Hill?
The month with the longest days is June, with an average of 15h and 12min of daylight.
What are the months with the highest UV index in Boulder Hill?
June and July, with an average maximum UV index of 6, are months with the highest UV index in Boulder Hill, Illinois.
What are the warmest months in Boulder Hill?
July, characterized by an average high temperature of 81.1°F (27.3°C) and a low temperature of 64.2°F (17.9°C), is generally the warmest month in Boulder Hill.
What month has the most sunshine in Boulder Hill?
July has the most sunshine of the year in Boulder Hill, with an average of 9.8h of sunshine.
What is the least humid month in Boulder Hill?
With an average relative humidity of 74%, October is the least humid month.
What is the driest month in Boulder Hill?
November and December are months with the least rain when the rain falls for 7.6 days and typically aggregates up to 0.75" (19mm) of rain.
What is the month with the shortest days in Boulder Hill?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Boulder Hill, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.4°F).
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure
Boulder Hill, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"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:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Boulder Hill, IL
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.7mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.1mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Boulder Hill, IL
The months with the highest relative humidity are January, February, July and August (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Boulder Hill, IL
- Average rainfall in January:
0.87" - Average rainfall in February:
0.79" - Average rainfall in March:
0.94" - Average rainfall in April:
1.77" - Average rainfall in May:
2.13" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.17" - Average rainfall in August:
1.77" - Average rainfall in September:
1.3" - Average rainfall in October:
1.46" - Average rainfall in November:
0.75" - Average rainfall in December:
0.75"
The wettest month (with the highest rainfall) is June (2.24").
The driest months (with the least rainfall) are November and December (0.75").
Average rainfall days
Boulder Hill, IL
- Average rainfall days in January:
5 days - Average rainfall days in February:
4.3 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
14.4 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
14.9 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
15 days - Average rainfall days in September:
12 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
7.6 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall
Boulder Hill, IL
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Boulder Hill, IL
- Average snowfall days in January:
10.7 days - Average snowfall days in February:
9.3 days - Average snowfall days in March:
5.6 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 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:
0.4 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
8.8 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Boulder Hill, 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 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Boulder Hill, IL
- Average sunshine days in January:
17 days - Average sunshine days in February:
15.4 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
12.5 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
10.2 days - Average sunshine days in August:
11.6 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.2 days).
Average UV index
Boulder Hill, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Boulder Hill, IL
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility
Boulder Hill, 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).
Boulder Hill, Illinois, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location