Weather in Crystal Lake, IL
Crystal Lake, Friday, 30 October, 14:38
Overcast. Feels like 54°. High 56°, low 42°.
Monthly outlook for Crystal Lake, IL: average high 54°, average low 45°. That is 1.7° above the climate normal for October. Precipitation is expected on 7 days (about 2.6 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 3 November (66.6°), the coolest 11 November (33.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 30 October – 8 November | 57.7° | 52.8° | +2.7° |
| 9 November – 18 November | 47.7° | 47.2° | +0.3° |
| 19 November – 28 November | at normal | 43° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Elgin (13 mi).
0.74
Crystal Lake, Saturday, 31 October
Heavy rain. High 65°, low 50°.
0Crystal Lake, Sunday, 1 November
Overcast. High 62°, low 54°.
0Crystal Lake, Monday, 2 November
Light rain. High 62°, low 53°.
0.11Crystal Lake, Tuesday, 3 November
Light rain. High 67°, low 62°.
0.8Crystal Lake, Wednesday, 4 November
Rain. High 65°, low 57°.
0.08Crystal Lake, Thursday, 5 November
Light rain. High 55°, low 51°.
0Crystal Lake, Friday, 6 November
Overcast. High 49°, low 45°.
0
Crystal Lake, Saturday, 7 November
Mostly clear. High 48°, low 37°.
0Crystal Lake, Sunday, 8 November
Overcast. High 47°, low 36°.
0.02Crystal Lake, Monday, 9 November
Light rain. High 49°, low 40°.
0.08Crystal Lake, Tuesday, 10 November
Light rain. High 46°, low 41°.
0
Crystal Lake, Wednesday, 11 November
Clear. High 48°, low 33°.
0Crystal Lake, Thursday, 12 November
Clear. High 49°, low 34°.
0.15Crystal Lake, Friday, 13 November
Light rain. High 46°, low 40°.
0.62Crystal Lake, Saturday, 14 November
Rain. High 50°, low 44°.
0.08
Crystal Lake, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Crystal Lake, Monday, 16 November
Climate normal for this date — 60-year average.
0.08Crystal Lake, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.1Crystal Lake, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.07Crystal Lake, Thursday, 19 November
Climate normal for this date — 60-year average.
0.08Crystal Lake, Friday, 20 November
Climate normal for this date — 60-year average.
0.1Crystal Lake, Saturday, 21 November
Climate normal for this date — 60-year average.
0.03Crystal Lake, Sunday, 22 November
Climate normal for this date — 60-year average.
0.07Crystal Lake, Monday, 23 November
Climate normal for this date — 60-year average.
0.08Crystal Lake, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.08Crystal Lake, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.11
Crystal Lake, Thursday, 26 November
Climate normal for this date — 60-year average.
0.2Crystal Lake, Friday, 27 November
Climate normal for this date — 60-year average.
0.12Crystal Lake, Saturday, 28 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 Crystal Lake, 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 Crystal Lake, 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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