Weather in McHenry, IL
McHenry, Saturday, 10 October, 11:03
Clear. Feels like 72°. High 77°, low 58°.
Monthly outlook for McHenry, IL: average high 59.7°, average low 45°. That is 0.5° above the climate normal for October. Precipitation is expected on 4 days (about 0.5 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 12 October (80.6°), the coolest 18 October (25.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 62.6° | 59.7° | +1.6° |
| 20 October – 29 October | 55° | 56° | -0.6° |
| 30 October – 8 November | at normal | 51.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (11 mi).
0McHenry, Sunday, 11 October
Clear. High 74°, low 54°.
0McHenry, Monday, 12 October
Clear. High 81°, low 61°.
0
McHenry, Tuesday, 13 October
Overcast. High 73°, low 62°.
0.08
McHenry, Wednesday, 14 October
Light rain. High 62°, low 55°.
0McHenry, Thursday, 15 October
Overcast. High 58°, low 53°.
0.05McHenry, Friday, 16 October
Light rain. High 58°, low 38°.
0McHenry, Saturday, 17 October
Overcast. High 42°, low 32°.
0
McHenry, Sunday, 18 October
Mostly clear. High 46°, low 25°.
0McHenry, Monday, 19 October
Overcast. High 54°, low 35°.
0McHenry, Tuesday, 20 October
Overcast. High 56°, low 40°.
0.12McHenry, Wednesday, 21 October
Light rain. High 54°, low 48°.
0McHenry, Thursday, 22 October
Clear. High 62°, low 43°.
0McHenry, Friday, 23 October
Clear. High 55°, low 40°.
0McHenry, Saturday, 24 October
Overcast. High 54°, low 37°.
0.21McHenry, Sunday, 25 October
Light rain. High 49°, low 38°.
0.13
McHenry, Monday, 26 October
Climate normal for this date — 60-year average.
0.08
McHenry, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.05McHenry, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06McHenry, Thursday, 29 October
Climate normal for this date — 60-year average.
0.09McHenry, Friday, 30 October
Climate normal for this date — 60-year average.
0.12McHenry, Saturday, 31 October
Climate normal for this date — 60-year average.
0.16McHenry, Sunday, 1 November
Climate normal for this date — 60-year average.
0.14McHenry, Monday, 2 November
Climate normal for this date — 60-year average.
0.06McHenry, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.1McHenry, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12McHenry, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09McHenry, Friday, 6 November
Climate normal for this date — 60-year average.
0.05McHenry, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04McHenry, Sunday, 8 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for McHenry, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in McHenry, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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