Climate Insights for Belvidere

Kauai County, Illinois, United States

Hottest
June
28°C peak
Coldest
January
-8°C low
Wettest
March
135mm rain
Best to Visit
June, August, September
Mild temps & low rain

Climate Overview

The climate in Belvidere is temperate. The average annual temperature is 11°C and approximately 916mm of precipitation falls per year. March is the wettest month, receiving around 135mm of rainfall. Belvidere is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, December, February, when temperatures can drop to -8°C. Snowfall occurs from January to December, with around 89cm accumulating over the season.

Temperature

-10° 10° 20° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: -1° Average: -5° Min: -8° Feb Max: 2° Average: -2° Min: -5° Mar Max: 11° Average: 6° Min: 2° Apr Max: 15° Average: 9° Min: 4° May Max: 22° Average: 16° Min: 11° Jun Max: 28° Average: 22° Min: 17° Jul Max: 28° Average: 23° Min: 19° Aug Max: 28° Average: 23° Min: 19° Sep Max: 25° Average: 20° Min: 16° Oct Max: 18° Average: 13° Min: 9° Nov Max: 12° Average: 7° Min: 4° Dec Max: -2° Average: -4° Min: -7°
Max
Average
Min

Belvidere has a wide annual temperature range, spanning 36°C from the coldest to warmest months. The warmest month is June, when average highs reach 28°C and the mean temperature sits around 22°C. The coldest month is January, when overnight lows fall to -8°C and the daily average is -5°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 12°C shift in average temperatures.

Precipitation

0mm 25mm 50mm 75mm 100mm 125mm 150mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 31mm Snow: 13mm Feb Precipitation: 23mm Snow: 14mm Mar Precipitation: 135mm Snow: 19mm Apr Precipitation: 76mm Snow: 2mm May Precipitation: 104mm Snow: 0mm Jun Precipitation: 74mm Snow: 0mm Jul Precipitation: 120mm Snow: 0mm Aug Precipitation: 95mm Snow: 0mm Sep Precipitation: 70mm Snow: 0mm Oct Precipitation: 74mm Snow: 0mm Nov Precipitation: 65mm Snow: 0mm Dec Precipitation: 51mm Snow: 41mm
Precipitation
Snow

Belvidere is a moderately rainy area, receiving approximately 916mm of precipitation annually, which averages out to around 76mm per month. The wettest month is March, averaging 135mm of rainfall. July and May also tend to see above-average precipitation. The driest month is February, with just 23mm. That's 112mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 89cm accumulating over the season. December typically sees the most snow at around 41cm.

Wind

0km/h 5km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 4km/h Feb Wind Speed: 4km/h Mar Wind Speed: 4km/h Apr Wind Speed: 4km/h May Wind Speed: 3km/h Jun Wind Speed: 3km/h Jul Wind Speed: 3km/h Aug Wind Speed: 3km/h Sep Wind Speed: 4km/h Oct Wind Speed: 4km/h Nov Wind Speed: 4km/h Dec Wind Speed: 4km/h
Wind Speed

Belvidere is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

52 days until Autumn

It is currently summer in Belvidere, which began on June 21, 2026. Belvidere is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in June at around 28°C, while the coldest stretch bottoms out in January near -8°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

Spring

Temperatures range from 2 to 22°C. Rainfall is heavy, totalling around 314mm across the season with a monthly average of 105mm. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 17 to 28°C. Precipitation is moderate at around 288mm for the season, averaging 96mm per month. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 4 to 25°C. Precipitation is moderate at around 209mm for the season, averaging 70mm per month. Winds are generally light, averaging 4km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.

Winter

Temperatures range from -8 to 2°C. Rainfall is relatively light, with around 105mm over the season and a monthly average of 35mm. Expect around 68cm of snow accumulation during this period. Winds are generally light, averaging 4km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.

Best Time to Visit

Jan -5°
Feb -2°
Mar
Apr
May 16°
Jun 22°
Jul 23°
Aug 23°
Sep 20°
Oct 13°
Nov
Dec -4°

The best time to visit Belvidere is during June, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 80mm per month. By contrast, January can be quite cold with temperatures dropping to -8°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

Monthly Climate Data

The table below shows monthly climate averages for Belvidere based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
-8 °C
-1 °C
4 km/h
31 mm
13 cm
Feb
-5 °C
2 °C
4 km/h
23 mm
14 cm
Mar
2 °C
11 °C
4 km/h
135 mm
19 cm
Apr
4 °C
15 °C
4 km/h
76 mm
2 cm
May
11 °C
22 °C
3 km/h
104 mm
0 cm
Jun
17 °C
28 °C
3 km/h
74 mm
0 cm
Jul
19 °C
28 °C
3 km/h
120 mm
0 cm
Aug Current
19 °C
28 °C
3 km/h
95 mm
0 cm
Sep
16 °C
25 °C
4 km/h
70 mm
0 cm
Oct
9 °C
18 °C
4 km/h
74 mm
0 cm
Nov
4 °C
12 °C
4 km/h
65 mm
0 cm
Dec
-7 °C
-2 °C
4 km/h
51 mm
41 cm
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