Climate and monthly weather forecastLake Bluff, IL
Climate and monthly weather forecast
The climate of Lake Bluff
Lake Bluff, Illinois, USA, is situated within a Köppen climate classification of Dfa. This translates to a humid continental climate with a hot summer, and no dry season. These conditions are fairly characteristic of the region. Across the year, a continuous change is observed in the climate parameters, including temperature, rainfall, and humidity.Fluctuations in temperature present a clear demarcation of seasons. High temperatures move from 28.6°F (-1.9°C) in January to a peak of 77.7°F (25.4°C) in July, then falls back to 34.5°F (1.4°C) by December. Low temperatures follow a similar trajectory but with a gentler slope — from 18.9°F (-7.3°C) in January to 66.7°F (19.3°C) in July, ending at 26.2°F (-3.2°C) in December. Rainfall is slightly less predictable, it starts with 1.54" (39mm) in January, peaks at 3.82" (97mm) in May and June, then drops to 1.3" (33mm) in December. Rainfall days provides an additional aspect to this pattern, reaching their maximum in May with 17.7 days.
Percent cloud cover diminishes from 61% in January to 27% from July to August, before increasing back up to 58% in December. Snowfall is limited to the colder months, stretching from November to April with the greatest in January at 4.13" (105mm). The quantity of daylight increases from 9.5 hours in January to 15.2 hours in June, then contracts back to 9.1 hours by December.
The best time to visit Lake Bluff
Determining the best time to visit Lake Bluff depends on the preferences of the visitor. For those who enjoy warmer weather, June to August offers the best conditions, with high temperatures from 71.1°F (21.7°C) to 77.7°F (25.4°C) accompanied by delightful 10.6 to 10.7 hours of sunshine per day. Relative humidity during these months remain stable at about 79%, ensuring a comfortable visit. It's also note-worthy that these months witness the highest sea temperatures, which reach up to 70.2°F (21.2°C) to 73.3°F (22.9°C), perfect for water activities.The worst time to visit Lake Bluff
On the contrary, the period from November to February might be slightly unfavorable for tourists due to the chilling winter conditions. High temperatures drop to between 28.6°F (-1.9°C) and 34.5°F (1.4°C) and can go even lower at night. Along with this drastic drop in temperature, snowfall rates reach their highest, especially in January when it gets to 4.13" (105mm). Moreover, the daylight period substantially decreases to between 9.1 hours and 9.8 hours, limiting daylight activities.Spring weather in Lake Bluff
The season of spring, March through May in Lake Bluff, provides a moderate climate suitable for outdoor activities. Average high temperatures surge from 41.5°F (5.3°C) to 61.2°F (16.2°C). However, the considerable rainfall during these months — 1.77" (45mm) in March, rising to 3.82" (97mm) in May — along with an average of 16.1 rainfall days in April, indicate that visitors will need to be prepared for frequent wet weather.Summer weather in Lake Bluff
Summer in Lake Bluff from June to August witnesses an increase in temperature, with the highest reaching 77.7°F (25.4°C) in July. These warm conditions, accompanied by the longest daylight hours, 15.2 hours in June, provide ample opportunity to indulge in outdoor recreation. Sea temperatures are most favorable for swimming during this season, rising to 73.3°F (22.9°C) in August.Autumn weather in Lake Bluff
Autumn from September to November sees a steady decline in temperature from 71.2°F (21.8°C) to 45.5°F (7.5°C). While September is still relatively warm with an average high of 71.2°F (21.8°C), by November this steadily decreases to 45.5°F (7.5°C). Autumn also brings in fairly consistent rainy conditions, with rainfall varying from 2.6" (66mm) in September to 1.5" (38mm) in November.Winter weather in Lake Bluff
Winter in Lake Bluff, from December through February, is characterized by considerably cooler temperatures and substantial snowfall. High temperatures reduce to 34.5°F (1.4°C) in December and to 28.6°F (-1.9°C) by January. Snowfall escalates during these months, with January showcasing the heaviest snowfall of the year at 4.13" (105mm). These colder months are well-suited to those who enjoy winter sports and activities.Weather in January
In Lake Bluff, January welcomes the New Year with its coldest temperatures, the average high and low temperatures settle at 28.6°F (-1.9°C) and 18.9°F (-7.3°C) respectively. Morning ice crystals lend a magical touch to the landscape. Weather in January »Weather in February
February unfolds with a slight increment in temperature, marking a subtle transition towards spring. Snowfall tapers off from 4.13" (105mm) in January to 3.35" (85mm). The winter chill begins to recede, only to pave the way for dew-laden mornings and crisper sunsets. Weather in February »Weather in March
March ushers in early spring in Lake Bluff, with a noticeable dip in snowfall to 1.02" (26mm). The transition from frigid conditions to balmy days progresses gradually. Expect to witness the last of frosted windows and watch as green tendrils begin to surprise the thawing landscape. Weather in March »Weather in April
The advent of April in Lake Bluff is synonymous with spring in full bloom. Sleet and snow of previous months give way to refreshing downpours with rainfall reaching up to 3.43" (87mm), ushering in the season of rejuvenation. The increase in average low temperatures alongside burgeoning flora transform the cityscape. Weather in April »Weather in May
May flourishes with balmy temperatures, progressing Lake Bluff further into the heart of spring. The increase in daylight hours introduce warmer, longer days, outranking its April predecessor. The occasional drizzle showers the revitalized flora, brushing up the stunning prismatic view of the cityscape. Weather in May »Weather in June
Shifting into the peak summer months, June in Lake Bluff boasts longer days and soaring temperatures. The weather remains consistent, reflected in the city's bustling outdoor scene. Basking under the radiance of longer sunshine hours, the city is charged with sizzling energy. Weather in June »Weather in July
July represents the zenith of summer in Lake Bluff, embracing the highest temperatures of the year with the maximum reaching 77.7°F (25.4°C). A dip in the lake is often the day's highlight, as residents flock to beaches to escape the heat. Weather in July »Weather in August
August continues the summer spree in Lake Bluff with similar temperatures to July, prologuing the joy of summertime. The city resonates with blooming flora, vibrant festivals, and bustling markets. Although daylight hours shorten slightly compared to July, the clear skies and balmy nights sustain the essence of summer. Weather in August »Weather in September
September marks the onset of fall in Lake Bluff with a noticeable drop in temperature from the preceding months. The city takes on an organic and warm palette, boasting an enchanting blend of summer and fall. The decrease in average highs is gradual, but perceptible, introducing a touch of crispness to the air. Weather in September »Weather in October
In October, Lake Bluff dives headfirst into autumn, bringing along a notable drop in temperature. The landscape is sprinkled with hues of amber, indicating the final transition from balmy afternoons to cooler days. As temperatures dip, the city responds with an offbeat rhythm of heartwarming activities. Weather in October »Weather in November
November paves the way for winter in Lake Bluff, registering lower temperatures and shorter daylight hours. The vibrant shades of autumn subtly fade into the stark beauty of winter. The arrival of the first snowfall, measuring 1.26" (32mm), seems like the city is being sprinkled with powdered sugar. Weather in November »Weather in December
December in Lake Bluff announces the full blown winter season, witness the year's maximum snowfall of 2.05" (52mm). The transition into areas coated in flurries is gradual, echoing the shifting weather patterns over November. Lakes transform into icy plains, while Christmas decorations breathe life into white landscapes. Weather in December »Updated: Aug 22, 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
The coldest period is January, when temperatures fluctuate between an average high of 28.6°F (-1.9°C) and a low of 18.9°F (-7.3°C).
January and February, with an average relative humidity of 82%, are most humid months in Lake Bluff, Illinois.
In Lake Bluff, during the entire year, the rain falls for 154.1 days and collects up to 30.24" (768mm) of precipitation.
January through April, October through December are months with snowfall.
January is the month with the most snowfall. Snow falls for 11.9 days and accumulates 4.13" (105mm) of snow.
In Lake Bluff, during the entire year, snow falls for 42.9 days and aggregates up to 13.82" (351mm) of snow.
January has the least sunshine of the year, with an average of 3.8h of sunshine.
With an average ocean temperature of 37°F (2.8°C), February is the month with the coldest seawater.
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.
The months with the most rainfall are May and June, with an average 3.82" (97mm) of precipitation.
In Lake Bluff, snow does not fall in May through September.
June has the longest days of the year, with an average of 15h and 12min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
Lake Bluff records the warmest temperatures in July, averaging a high of 77.7°F (25.4°C) and a low of 66.7°F (19.3°C).
August is the month with the warmest seawater, with an average ocean temperature of 73.2°F (22.9°C).
August has the most sunshine of the year, with an average of 10.7h of sunshine.
The least humid month is October, with an average relative humidity of 73%.
December is the month with the least rainfall. Rain falls for 8.6 days and accumulates 1.3" (33mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 6min of daylight.
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Lake Bluff, IL
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (28.6°F).
The months with the highest average low temperature are July and August (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Lake Bluff, IL
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.09"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 (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Lake Bluff, IL
- Average wind speed in January:
11.9mph - Average wind speed in February:
11.6mph - Average wind speed in March:
10.7mph - Average wind speed in April:
10.8mph - Average wind speed in May:
9.1mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.5mph - Average wind speed in August:
7.4mph - Average wind speed in September:
8.9mph - Average wind speed in October:
10.7mph - Average wind speed in November:
11.5mph - Average wind speed in December:
11.2mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity
Lake Bluff, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Lake Bluff, IL
- Average rainfall in January:
1.54" - Average rainfall in February:
1.54" - Average rainfall in March:
1.77" - Average rainfall in April:
3.43" - Average rainfall in May:
3.82" - Average rainfall in June:
3.82"
The wettest months (with the highest rainfall) are May and June (3.82").
The driest month (with the least rainfall) is December (1.3").
Average rainfall days
Lake Bluff, IL
- Average rainfall days in January:
6.2 days - Average rainfall days in February:
5.9 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
17.7 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
17.4 days - Average rainfall days in August:
15.8 days - Average rainfall days in September:
13.6 days - Average rainfall days in October:
14.7 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
8.6 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.9 days).
Average snowfall
Lake Bluff, IL
The month with the highest snowfall is January (4.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Lake Bluff, IL
- Average snowfall days in January:
11.9 days - Average snowfall days in February:
9.5 days - Average snowfall days in March:
5.8 days - Average snowfall days in April:
2.4 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:
0.5 days - Average snowfall days in November:
3.7 days - Average snowfall days in December:
9.1 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature
Lake Bluff, IL
The best month for swimming (with the highest average sea temperature) is August (73.3°F).
The coldest month (with the lowest average sea temperature) is February (37.1°F).
Average daylight / Average sunshine
Lake Bluff, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
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 6min).
- Average sunshine in January:
3h and 48min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 12min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Lake Bluff, IL
- Average sunshine days in January:
12.8 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
14 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
11.2 days - Average sunshine days in June:
11.2 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
13.1 days - Average sunshine days in September:
13.3 days - Average sunshine days in October:
13.6 days - Average sunshine days in November:
14.7 days - Average sunshine days in December:
15.3 days
The month with the most sunshine days is December (15.3 days).
The month with the least sunshine days is April (10.8 days).
Average UV index
Lake Bluff, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Lake Bluff, IL
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility
Lake Bluff, 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).
