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City briefing

Jacksonville

Illinois, United States · 18,000 people
Jan
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Apr
May
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The year’s records
Annual mean 13°C · wettest around March · prevailing wind SW
Warmest
28.3 °C
Coldest
-1.2 °C
Wettest
66%
Windiest
5.8 m/s
Prevailing
SW
4.4 m/s average

When this place is good five ratings · thirty-six ten-day sections · click a cell to read it

Jan
Feb
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May
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Every reading

bars actual · line feels-like, °C
-10-5051015202530JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember-10-5051015202530JFMAMJJASOND

The average temperature in Jacksonville over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -4°C.

Month by month Jacksonville climate by month: average temperatures year round · click a month to read it

MonthHighLowFeels likeChance of rainCloudWindBeing outsideSunWalking
January-0°C-4°C-6°C53%55%4.0 m/s005
February3°C-2°C-2°C54%45%4.1 m/s4018
March10°C3°C4°C60%48%4.4 m/s9033
April15°C8°C11°C59%42%4.4 m/s30354
May22°C14°C19°C59%42%3.5 m/s582254
June27°C20°C27°C57%26%2.9 m/s465321
July28°C21°C30°C57%30%2.2 m/s25586
August27°C19°C29°C56%32%2.1 m/s405613
September26°C16°C25°C54%27%2.4 m/s564733
October18°C10°C14°C55%38%3.2 m/s411057
November10°C3°C5°C55%39%3.7 m/s12036
December4°C-1°C-2°C56%48%3.8 m/s1014

High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.

Seasons, and the year in short Jacksonville weather by season

Year round, Jacksonville has days of about -0°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -4°C to 21°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around March and least likely around January. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.

Jacksonville weather in winterDecember to February

High 2°CLow -2°CRain 54%

Winter in Jacksonville has typical daily highs of about 2°C and lows of about -2°C, with a 54% chance of rain on a given day.

Jacksonville weather in springMarch to May

High 16°CLow 9°CRain 59%

Spring in Jacksonville has typical daily highs of about 16°C and lows of about 9°C, with a 59% chance of rain on a given day.

Jacksonville weather in summerJune to August

High 28°CLow 20°CRain 57%

Summer in Jacksonville has typical daily highs of about 28°C and lows of about 20°C, with a 57% chance of rain on a given day.

Jacksonville weather in autumnSeptember to November

High 18°CLow 9°CRain 54%

Autumn in Jacksonville has typical daily highs of about 18°C and lows of about 9°C, with a 54% chance of rain on a given day.

When is the rainy season in Jacksonville?

Jacksonville has no sharply defined rainy season: the chance of rain on a given day runs from 53% in January, the driest month, to 60% in March, the wettest.

What time of year is Jacksonville windiest?

Winds in Jacksonville are highest in March, averaging 4.4 m/s (16 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the SW.

What is the average temperature in Jacksonville year round?

The average temperature in Jacksonville over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -4°C.

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