Climate Insights for Lawrenceville

Keith County, Illinois, United States

Hottest
July
31°C peak
Coldest
January
-3°C low
Wettest
April
133mm rain
Best to Visit
September
Mild temps & low rain

Climate Overview

The climate in Lawrenceville is temperate. The average annual temperature is 14°C and approximately 1294mm of precipitation falls per year. Lawrenceville receives a notable amount of rainfall throughout the year, including during its driest month. Lawrenceville is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, December, February, when temperatures can drop to -3°C. Light snow can occur between January and December.

Temperature

-10° 10° 20° 30° 40° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 5° Average: 1° Min: -3° Feb Max: 9° Average: 4° Min: 0° Mar Max: 13° Average: 8° Min: 4° Apr Max: 19° Average: 13° Min: 8° May Max: 25° Average: 20° Min: 15° Jun Max: 30° Average: 25° Min: 20° Jul Max: 31° Average: 26° Min: 22° Aug Max: 29° Average: 24° Min: 20° Sep Max: 28° Average: 22° Min: 17° Oct Max: 21° Average: 15° Min: 10° Nov Max: 12° Average: 7° Min: 3° Dec Max: 7° Average: 2° Min: -1°
Max
Average
Min

Temperatures in Lawrenceville vary considerably across the year, with a 34°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is 1°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°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: 99mm Snow: 11mm Feb Precipitation: 113mm Snow: 10mm Mar Precipitation: 128mm Snow: 4mm Apr Precipitation: 133mm Snow: 2mm May Precipitation: 130mm Snow: 0mm Jun Precipitation: 107mm Snow: 0mm Jul Precipitation: 121mm Snow: 0mm Aug Precipitation: 108mm Snow: 0mm Sep Precipitation: 66mm Snow: 0mm Oct Precipitation: 95mm Snow: 0mm Nov Precipitation: 109mm Snow: 4mm Dec Precipitation: 85mm Snow: 7mm
Precipitation
Snow

Lawrenceville is a fairly wet location, receiving approximately 1294mm of precipitation annually, which averages out to around 108mm per month. The wettest month is April, averaging 133mm of rainfall. May and March also tend to see above-average precipitation. The driest month is September, with just 66mm. That's 67mm less than April, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 37cm annually. January is the snowiest month with approximately 11cm.

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: 2km/h Aug Wind Speed: 2km/h Sep Wind Speed: 3km/h Oct Wind Speed: 3km/h Nov Wind Speed: 3km/h Dec Wind Speed: 3km/h
Wind Speed

Lawrenceville is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

Seasons

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

92 days until Autumn

It is currently summer in Lawrenceville, which began on June 21, 2026. Lawrenceville 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 July at around 31°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

Spring

Temperatures range from 4 to 25°C. Rainfall is heavy, totalling around 391mm across the season with a monthly average of 130mm. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 20 to 31°C. Rainfall is heavy, totalling around 336mm across the season with a monthly average of 112mm. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 3 to 28°C. Precipitation is moderate at around 270mm for the season, averaging 90mm per month. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from -3 to 9°C. Precipitation is moderate at around 296mm for the season, averaging 99mm per month. Expect around 27cm 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
Feb
Mar
Apr 13°
May 20°
Jun 25°
Jul 26°
Aug 24°
Sep 22°
Oct 15°
Nov
Dec

The best time to visit Lawrenceville is during September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 66mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to -3°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

Monthly Climate Data

The table below shows monthly climate averages for Lawrenceville 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
-3 °C
5 °C
4 km/h
99 mm
11 cm
Feb
0 °C
9 °C
4 km/h
113 mm
10 cm
Mar
4 °C
13 °C
4 km/h
128 mm
4 cm
Apr
8 °C
19 °C
4 km/h
133 mm
2 cm
May
15 °C
25 °C
3 km/h
130 mm
0 cm
Jun Current
20 °C
30 °C
3 km/h
107 mm
0 cm
Jul
22 °C
31 °C
2 km/h
121 mm
0 cm
Aug
20 °C
29 °C
2 km/h
108 mm
0 cm
Sep
17 °C
28 °C
3 km/h
66 mm
0 cm
Oct
10 °C
21 °C
3 km/h
95 mm
0 cm
Nov
3 °C
12 °C
3 km/h
109 mm
4 cm
Dec
-1 °C
7 °C
3 km/h
85 mm
7 cm
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