New Lenox Climate by Month
New Lenox, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's New Lenox's climate in short. Expect highs of 84°F (29°C) in July and 32°F (0°C) in January, with the coldest nights (January) near 16°F (-9°C). It gets 39 in (998 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 39 in(998 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in New Lenox
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (25°C) and about 3.4 in (87 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 32°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
New Lenox weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 16°F(-9°C) | 1.8 in(45 mm) | 91% | 1.4 |
| FebFebruary | 37°F(3°C) | 19°F(-7°C) | 1.6 in(41 mm) | 77% | 2.5 |
| MarMarch | 48°F(9°C) | 29°F(-1°C) | 2.4 in(61 mm) | 75% | 3.6 |
| AprApril | 61°F(16°C) | 39°F(4°C) | 4.6 in(117 mm) | 66% | 4.4 |
| MayMay | 72°F(22°C) | 49°F(10°C) | 4.6 in(116 mm) | 66% | 5.1 |
| JunJune | 81°F(27°C) | 59°F(15°C) | 4.8 in(123 mm) | 68% | 5.8 |
| JulJuly | 84°F(29°C) | 63°F(17°C) | 4.1 in(103 mm) | 70% | 6.0 |
| AugAugust | 82°F(28°C) | 62°F(17°C) | 4.1 in(103 mm) | 75% | 5.2 |
| SepSeptemberBest | 76°F(25°C) | 54°F(12°C) | 3.4 in(87 mm) | 71% | 4.4 |
| OctOctober | 64°F(18°C) | 42°F(6°C) | 3.0 in(77 mm) | 65% | 2.8 |
| NovNovember | 49°F(10°C) | 32°F(0°C) | 2.7 in(68 mm) | 82% | 1.7 |
| DecDecember | 37°F(3°C) | 22°F(-6°C) | 2.2 in(57 mm) | 91% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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