Climate and monthly weather forecast
Bloomington, IL

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The climate of Bloomington

Bloomington, a vibrant city within the U.S. state of Illinois, nestles in an area dominated by a humid continental climate, identified as Dfa according to the Köppen Climate Classification. This setting sparks off significant temperature variations and precipitation throughout the year.

A closer look into the climatic data reveals a series of patterns. Monthly highs average from 30.7°F (-0.7°C) in January to a peak of 80.8°F (27.1°C) in July showing the sharp distinction between summer and winter temperatures. Simultaneously, night temperatures fluctuate between 18.9°F (-7.3°C) in winter and 64.6°F (18.1°C) in summer. The annual range of temperatures suggests profound differences between seasons.

Further into weather parameters, notable variations occur in the annual precipitation pattern. The city receives a rainfall range from 1.18" (30mm) in January to approximately 2.99" (76mm) in May. With 17.5 rainfall days, May also marks the peak of precipitation frequency. In contrast, dry months like December register lower rainfall figures around 1.22" (31mm) distributed over 7.1 days. December along with January and February also bring snowfall, with values extending up to 2.44" (62mm) in January.

Analyzing sunlight data reveals that June enjoys the longest daylight hours extending to 15 hours, whereas December experiences the shortest span of light, limited to around 9.3 hours. The sunshine duration aligns with this pattern, with up to 9.7 hours of clear skies in June and a shorter period of 4.1 hours in December.

The best time to visit Bloomington

The ideal period to visit Bloomington is the warmer half of the year. From May to September, the climate is warmer, and the temperatures are conducive for outdoor activities. In June, the highest amount of daylight (15 hours) and sunshine (9.7 hours) occur, creating perfect conditions for sightseeing and exploring the city.

The worst time to visit Bloomington

The city can exhibit harsh and unfavorable weather conditions, particularly during the colder months from November through March. The temperatures are at their lowest, with January being the coldest, displaying a high of just 30.7°F (-0.7°C). During this phase, the city also experiences noticeable snowfall as well as reduced daylight and sunshine hours.

Spring weather in Bloomington

Between March and May, Bloomington witnesses spring and a gradual increase in temperature. The average maximum extends from 48.7°F (9.3°C) in March to 72°F (22.2°C) in May while the minimum temperature ranges from 34°F (1.1°C) to 55.4°F (13°C). Additionally, the leap from 1.65" (42mm) of precipitation in March to 2.99" (76mm) in May indicates a moistening trend during the season.

Summer weather in Bloomington

The summer season, from June to August, is characterized by warm temperatures. The daytime highs average around 80°F (26.7°C) while the nights stay comfortable with temperatures a bit above 60°F (15.6°C). Despite the higher temperatures, these are also the months with the most daylight hours and the maximum amount of sunshine.

Autumn weather in Bloomington

Autumn in Bloomington covers September through November. It brings in a noticeable dip in temperatures but remains fairly mild compared to winter, with the daytime highs averaging between 75.7°F (24.3°C) in September and 47.7°F (8.7°C) in November. The rainfall decreases during these months, making the season slightly drier than spring and summer.

Winter weather in Bloomington

Winter, prevailing from December until February, brings cold and snappy conditions to Bloomington. High temperatures can reach 30.7°F (-0.7°C) in January while the lows can plummet to a chilly 18.9°F (-7.3°C). The months are marked by reduced sunlight duration and increased cloud cover, while snowfall is prominent, enhancing the frosty feel of the season.

Weather in January

In Bloomington, Illinois, the year commences with brisk temperatures and predominant cloud coverage, marking January as a typical winter month. Highs of 30.7°F (-0.7°C) and lows of 18.9°F (-7.3°C) are accompanied by snowy conditions, transforming the city into a winter wonderland. Weather in January »

Weather in February

The cold persists throughout February in Bloomington, albeit with a slightly increased average temperature. Strong gusty winds continue to sweep across the city, occasionally accompanied by snowfall, adding a few fresh inches to the already accumulated winter snow. Weather in February »

Weather in March

March heralds the arrival of spring in Bloomington as temperatures progressively rise and the landscapes gradually transform. Daylight hours lengthen and sunshine becomes more prevalent, providing warmer and brighter days. The transition from winter to spring is marked by melting snow and increased rainfall of roughly 1.65" (42mm), stimulating the city's natural regeneration. Weather in March »

Weather in April

April experiences a significant transition in Bloomington's weather calendar, with warmer temperatures and longer daylight hours. The city welcomes the onset of consistent spring weather, which includes an increase in rainfall to an average of 2.4" (61mm), nurturing the blooming flora. Weather in April »

Weather in May

May in Bloomington signifies the full bloom of spring, with mild temperatures and ample sunshine. The month is characterized by increasingly comfortable day temperatures, reinforcing the spring vibrancy. Increased rainfall nurtures the local flora, painting the city with various hues of greens. Weather in May »

Weather in June

June greets Bloomington with the onset of summer, featuring longer daylight hours and significantly warmer temperatures. The city becomes a hub for outdoor activities, facilitated by the ample sunshine covering the city for almost 15 hours a day. Weather in June »

Weather in July

Being the peak of summer, July brings the highest average temperature of 80.8°F (27.1°C) to Bloomington. The city is immersed in sunshine for most of the month, complemented by warm, balmy nights and a steady breeze, making it the quintessential summer month. Weather in July »

Weather in August

In August, summer persists in Bloomington featuring warm temperatures similar to the previous month. The ample sunshine continues to bathe the city, turning it into a hot summer haven, with the mercury hovering close to 79.9°F (26.6°C). Weather in August »

Weather in September

September embarks upon the transition from summer to fall in Bloomington, with temperatures starting to cool slightly. The city witnesses a gradual decrease in daylight hours, signaling the forthcoming change of season. Although rain showers become less frequent, they are substantial enough for the foliage to retain its lush green appearance. Weather in September »

Weather in October

October brings typical autumnal charm to Bloomington, Illinois with cooler temperatures and a noticeable shortening of daylight hours. Bloomington's cityscape transforms into a canvas of warm hues as the leaves begin to change. Weather in October »

Weather in November

November in Bloomington signifies the transition from the vibrant autumn to the onset of winter. The chill in the atmosphere becomes more pronounced as temperatures continue to drop, only reaching an average high of 47.7°F (8.7°C). Weather in November »

Weather in December

December is characterized by consistent cold weather in Bloomington, Illinois, making it a true winter month. With an average high temperature of 36.5°F (2.5°C), the city enters the depths of winter. The concentration of cloud coverage increases with the frequency of snowfall, adding to the winter charm. Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Bloomington?

Bloomington reaches its average lowest temperatures in January, measuring 30.7°F (-0.7°C) at the peak and 18.9°F (-7.3°C) at the lowest.

What is the driest month in Bloomington?

The month with the least rainfall in Bloomington is January, when the rain falls for 5.6 days and typically collects 1.18" (30mm) of precipitation.

How much does it rain in Bloomington?

In Bloomington, during the entire year, the rain falls for 140.6 days and collects up to 22.44" (570mm) of precipitation.

When does it snow in Bloomington?

Months with snowfall in Bloomington, Illinois, are January through April, October through December.

What is the snowiest month in Bloomington?

January is the month with the most snowfall in Bloomington, Illinois. Snow falls for 11.5 days and accumulates 2.44" (62mm) of snow.

How much does it snow in Bloomington?

In Bloomington, Illinois, during the entire year, snow falls for 35.4 days and aggregates up to 9.45" (240mm) of snow.

What is the month with the least sunshine in Bloomington?

The month with the least sunshine is January, with an average of 3.6h of sunshine.

What is the month with the lowest UV index in Bloomington?

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

When is Daylight Saving Time (DST) in Bloomington?

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 in Bloomington?

The month with the most rainfall in Bloomington is May, when the rain falls for 17.5 days and typically aggregates up to 2.99" (76mm) of precipitation.

When it does not snow in Bloomington?

May through September are months without snowfall.

When are the longest days in Bloomington?

With an average of 15h and 0min of daylight, June has the longest days of the year.

What month has the most sunshine in Bloomington?

The month with the most sunshine is June, with an average of 9.7h of sunshine.

When is the highest UV index in Bloomington?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Bloomington, Illinois.

What are the warmest months in Bloomington?

The month of July, characterized by an average high of 80.8°F (27.1°C) and a low of 64.6°F (18.1°C), is recognized as the warmest.

What is the most humid month in Bloomington?

With an average relative humidity of 85%, July is the most humid month in Bloomington, Illinois.

What is the least humid month in Bloomington?

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

What is the month with the shortest days in Bloomington?

The month with the shortest days in Bloomington, Illinois, is December, with an average of 9h and 18min of daylight.

Average temperature
Bloomington, IL

Average temperature - Bloomington, IL

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure
Bloomington, IL

Average pressure - Bloomington, IL

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed
Bloomington, IL

Average wind speed - Bloomington, IL

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

Average humidity
Bloomington, IL

Average humidity - Bloomington, IL

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).

Average rainfall
Bloomington, IL

Average rainfall - Bloomington, IL

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is January (1.18").

Average rainfall days
Bloomington, IL

Average rainfall days - Bloomington, IL

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.3 days).

Average snowfall
Bloomington, IL

Average snowfall - Bloomington, IL

The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Bloomington, IL

Average snowfall days - Bloomington, IL

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Bloomington, IL

Average daylight / Average sunshine - Bloomington, IL

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days
Bloomington, IL

Average sunshine days - Bloomington, IL

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (9.7 days).

Average UV index
Bloomington, IL

Average UV index - Bloomington, 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 visibility
Bloomington, IL

Average visibility - Bloomington, 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).

Bloomington, Illinois, USA

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