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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 Crystal Lake, Illinois, with an average temperature ranging between min 15.1°F (-9.4°C) and max 27°F (-2.8°C). The coldest period is January, when temperatures fluctuate between an average high of 27°F (-2.8°C) and a low of 15.1°F (-9.4°C). Weather in January »
Weather in February
February, the last month of the winter in Crystal Lake, is also a subzero cold month, with an average temperature varying between 30.6°F (-0.8°C) and 18°F (-7.8°C). Crystal Lake records an average high-temperature of a still subzero cold 30.6°F (-0.8°C) as February arrives, nearly mirroring the previous month's climate. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Crystal Lake, Illinois, with an average temperature fluctuating between 29.5°F (-1.4°C) and 43.3°F (6.3°C). In Crystal Lake, the average high-temperature in March rises, from a freezing cold 30.6°F (-0.8°C) in February, to a chilly 43.3°F (6.3°C). Weather in March »
Weather in April
April in Crystal Lake, Illinois, is a cool spring month, with an average temperature ranging between min 38.8°F (3.8°C) and max 54.7°F (12.6°C). April's arrival coincides with a rise in the average high-temperature, moving from March's chilly 43.3°F (6.3°C) to a cool 54.7°F (12.6°C). Weather in April »
Weather in May
The last month of the spring, May, is an enjoyable month in Crystal Lake, Illinois, with an average temperature ranging between min 50°F (10°C) and max 67.1°F (19.5°C). May sees a temperature increase, moving from a cool 54.7°F (12.6°C) in April to an enjoyable 67.1°F (19.5°C). Weather in May »
Weather in June
June, the first month of the summer in Crystal Lake, is a warm month, with an average temperature fluctuating between 59°F (15°C) and 76.1°F (24.5°C). June's arrival coincides with a rise in the average high-temperature, moving from May's comfortable 67.1°F (19.5°C) to a moderately hot 76.1°F (24.5°C). Weather in June »
Weather in July
July, like June, in Crystal Lake, Illinois, is another warm summer month, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 63.1°F (17.3°C). July, characterized by an average high temperature of 79.5°F (26.4°C) and a low temperature of 63.1°F (17.3°C), is generally the warmest month. Weather in July »
Weather in August
August, the last month of the summer in Crystal Lake, is also a moderately hot month, with temperature in the range of an average low of 61.9°F (16.6°C) and an average high of 78.1°F (25.6°C). Crystal Lake, Illinois, measures an average high-temperature of a still warm 78.1°F (25.6°C) in August, nearly consistent with the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Crystal Lake, Illinois, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 55°F (12.8°C). September's arrival aligns with a minor decrease in average high-temperatures, from August's warm 78.1°F (25.6°C) to an agreeable 72.5°F (22.5°C). Weather in September »
Weather in October
October, the same as September, in Crystal Lake, Illinois, is a moderate autumn month, with an average temperature varying between 43.9°F (6.6°C) and 59°F (15°C). As September transitions into October, Crystal Lake sees a drop in the average high-temperature, transitioning from a pleasant 72.5°F (22.5°C) to a mild 59°F (15°C). Weather in October »
Weather in November
November, the last month of the autumn in Crystal Lake, is another chilly month, with an average temperature varying between 31.8°F (-0.1°C) and 44.6°F (7°C). November signals a clear temperature drop, with average high-temperatures decreasing from October's moderate 59°F (15°C) to a frosty 44.6°F (7°C). Weather in November »
Weather in December
December, the first month of the winter in Crystal Lake, is also an icy month, with an average temperature fluctuating between 22.8°F (-5.1°C) and 32.9°F (0.5°C). The arrival of December corresponds with a shift in temperature, down from a frosty 44.6°F (7°C) in November to an icy 32.9°F (0.5°C). Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Crystal Lake?
January is the coldest month in Crystal Lake, exhibiting average temperatures of 27°F (-2.8°C) at the peak and 15.1°F (-9.4°C) at the base.
What are the most humid months in Crystal Lake?
The months with the highest humidity in Crystal Lake are January and February, with an average relative humidity of 85%.
How many days does it rain in Crystal Lake?
Throughout the year, in Crystal Lake, there are 146.9 rainfall days, and 21.22" (539mm) of precipitation is accumulated.
When does it snow in Crystal Lake?
Months with snowfall are January through May, October through December.
What is the snowiest month in Crystal Lake?
The month with the most snowfall is January, when snow falls for 12.5 days and typically aggregates up to 3.31" (84mm) of snow.
How much does it snow in Crystal Lake?
In Crystal Lake, Illinois, during the entire year, snow falls for 48.7 days and aggregates up to 11.85" (301mm) of snow.
What is the month with the least sunshine in Crystal Lake?
With an average of 3.7h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Crystal Lake?
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 Crystal Lake?
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 are the least humid months in Crystal Lake?
The months with the lowest humidity are April and October, with an average relative humidity of 76%.
What is the rainiest month in Crystal Lake?
June is the month with the most rainfall in Crystal Lake, Illinois. Rain falls for 16.3 days and accumulates 2.8" (71mm) of precipitation.
When it does not snow in Crystal Lake?
In Crystal Lake, snow does not fall in June through September.
When are the longest days in Crystal Lake?
June has the longest days of the year, with an average of 15h and 12min of daylight.
What are the warmest months in Crystal Lake?
Crystal Lake, Illinois, experiences its average highest temperatures in July, reaching a peak of 79.5°F (26.4°C) and a minimum of 63.1°F (17.3°C).
What month has the most sunshine in Crystal Lake?
The month with the most sunshine is July, with an average of 10h of sunshine.
What is the month with the highest UV index in Crystal Lake?
August is the month with the highest UV index in Crystal Lake, Illinois, with an average maximum UV index of 6.
What is the driest month in Crystal Lake?
The months with the least rainfall are November and December Rain falls for 8 days and accumulates 0.94" (24mm) of rain.
What is the month with the shortest days in Crystal Lake?
With an average of 9h and 12min of daylight, December has the shortest days of the year in Crystal Lake.
Average temperature
Crystal Lake, IL
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (27°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure
Crystal Lake, 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"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"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
Crystal Lake, IL
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.3mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity
Crystal Lake, IL
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall
Crystal Lake, IL
- Average rainfall in January:
1.1" - Average rainfall in February:
1.1" - Average rainfall in March:
1.22" - Average rainfall in April:
2.56" - Average rainfall in May:
2.52" - Average rainfall in June:
2.8"
- Average rainfall in July:
2.32" - Average rainfall in August:
2.52" - Average rainfall in September:
1.46" - Average rainfall in October:
1.73" - Average rainfall in November:
0.94" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is June (2.8").
The driest months (with the least rainfall) are November and December (0.94").
Average rainfall days
Crystal Lake, IL
- Average rainfall days in January:
5.5 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
15.1 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
18.5 days - Average rainfall days in August:
17.3 days - Average rainfall days in September:
12 days - Average rainfall days in October:
12.9 days - Average rainfall days in November:
8 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (4.8 days).
Average snowfall
Crystal Lake, IL
- Average snowfall in January:
3.31" - Average snowfall in February:
2.52" - Average snowfall in March:
1.34" - Average snowfall in April:
1.5" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Crystal Lake, IL
- Average snowfall days in January:
12.5 days - Average snowfall days in February:
10.7 days - Average snowfall days in March:
7.5 days - Average snowfall days in April:
2.2 days - Average snowfall days in May:
0.2 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:
0.7 days - Average snowfall days in November:
4 days - Average snowfall days in December:
10.9 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Crystal Lake, IL
- Average daylight in January:
9h and 3min - 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 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 1min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Crystal Lake, IL
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
11.3 days - Average sunshine days in May:
10.7 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
10 days - Average sunshine days in August:
10.4 days - Average sunshine days in September:
14.2 days - Average sunshine days in October:
15.4 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
16.2 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is July (10 days).
Average UV index
Crystal Lake, IL
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Crystal Lake, IL
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and September (Cloud cover 32).
Average visibility
Crystal Lake, IL
The months with the highest visibility are March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January, February and August (5mi).
Crystal Lake, Illinois, USA
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