McHenry Climate by Month
McHenry, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
McHenry has warm summers and freezing winters, with rain spread through the year. Afternoon highs range from 30°F (-1°C) in January to 83°F (28°C) in July, and January nights average 14°F (-10°C). About 37 in (948 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 83°F(28°C)
- Average high, July
- Coldest nights
- 14°F(-10°C)
- Average low, January
- Rain per year
- 37 in(948 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in McHenry
Best for weatherSeptember is the best time for weather in McHenry: highs near 75°F (24°C) and about 3.7 in (95 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 30°F (-1°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)
McHenry weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 30°F(-1°C) | 14°F(-10°C) | 1.7 in(44 mm) | 99% | 1.5 |
| FebFebruary | 34°F(1°C) | 17°F(-8°C) | 1.5 in(38 mm) | 85% | 2.5 |
| MarMarch | 46°F(8°C) | 27°F(-3°C) | 2.3 in(58 mm) | 69% | 3.6 |
| AprApril | 58°F(15°C) | 37°F(3°C) | 4.1 in(104 mm) | 63% | 4.5 |
| MayMay | 70°F(21°C) | 47°F(8°C) | 4.3 in(109 mm) | 66% | 5.1 |
| JunJune | 79°F(26°C) | 57°F(14°C) | 4.4 in(112 mm) | 73% | 5.8 |
| JulJuly | 83°F(28°C) | 61°F(16°C) | 3.8 in(97 mm) | 74% | 5.9 |
| AugAugust | 81°F(27°C) | 60°F(16°C) | 4.2 in(107 mm) | 75% | 5.1 |
| SepSeptemberBest | 75°F(24°C) | 52°F(11°C) | 3.7 in(95 mm) | 70% | 4.3 |
| OctOctober | 62°F(17°C) | 41°F(5°C) | 2.8 in(72 mm) | 69% | 2.7 |
| NovNovember | 47°F(9°C) | 30°F(-1°C) | 2.4 in(60 mm) | 75% | 1.7 |
| DecDecember | 35°F(2°C) | 20°F(-7°C) | 2.0 in(52 mm) | 80% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate outside the United States
- 🇨🇦ChathamOntario, Canada · Pop. 44k96%matchMilder wintersWetter wintersMcHenry vs Chatham →
- 🇨🇦LaSalleOntario, Canada · Pop. 33k94%matchMilder wintersWetter wintersMcHenry vs LaSalle →
- 🇨🇦LeamingtonOntario, Canada · Pop. 36k94%matchMilder wintersWetter wintersMcHenry vs Leamington →
- 🇨🇦LondonOntario, Canada · Pop. 422k93%matchWetter wintersMilder wintersMcHenry vs London →
- 🇨🇦SarniaOntario, Canada · Pop. 72k92%matchMilder wintersDrier summersMcHenry vs Sarnia →
- 🇺🇸JacksonMichigan, United States · Pop. 33k99%matchMilder wintersDrier summersMcHenry vs Jackson →
- 🇺🇸LansingMichigan, United States · Pop. 113k98%matchDrier summersMilder wintersMcHenry vs Lansing →
- 🇺🇸FlintMichigan, United States · Pop. 98k97%matchDrier summersMilder wintersMcHenry vs Flint →
- 🇺🇸SaginawMichigan, United States · Pop. 49k97%matchDrier summersMilder wintersMcHenry vs Saginaw →
- 🇺🇸Grand RapidsMichigan, United States · Pop. 195k97%matchMilder wintersWetter wintersMcHenry vs Grand Rapids →