Weather in Crystal Lake, IL
Crystal Lake, Sunday, 15 November, 02:01
Clear. Feels like 30°. High 50°, low 30°.
Monthly outlook for Crystal Lake, IL: average high 47°, average low 33°. That is 1.9° above the climate normal for November. Precipitation is expected on 3 days (about 1.6 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 21 November (59.3°), the coolest 25 November (24.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 November – 24 November | 50° | 45.1° | +2.7° |
| 25 November – 4 December | 42° | 39.8° | +1.3° |
| 5 December – 14 December | at normal | 35.2° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Elgin (13 mi).
0
Crystal Lake, Monday, 16 November
Clear. High 51°, low 33°.
0
Crystal Lake, Tuesday, 17 November
Mostly clear. High 53°, low 35°.
0
Crystal Lake, Wednesday, 18 November
Overcast. High 54°, low 39°.
0Crystal Lake, Thursday, 19 November
Overcast. High 57°, low 46°.
0.01
Crystal Lake, Friday, 20 November
Light rain. High 52°, low 35°.
0Crystal Lake, Saturday, 21 November
Overcast. High 59°, low 49°.
0.3
Crystal Lake, Sunday, 22 November
Snow. High 51°, low 29°.
0Crystal Lake, Monday, 23 November
Mostly clear. High 35°, low 25°.
0Crystal Lake, Tuesday, 24 November
Mostly clear. High 37°, low 25°.
0Crystal Lake, Wednesday, 25 November
Overcast. High 36°, low 24°.
0Crystal Lake, Thursday, 26 November
Overcast. High 41°, low 27°.
0.55Crystal Lake, Friday, 27 November
Rain. High 49°, low 35°.
0.72Crystal Lake, Saturday, 28 November
Snow. High 49°, low 35°.
0.03Crystal Lake, Sunday, 29 November
Light snow. High 38°, low 33°.
0
Crystal Lake, Monday, 30 November
Partly cloudy. High 40°, low 29°.
0.14
Crystal Lake, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.06Crystal Lake, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.09Crystal Lake, Thursday, 3 December
Climate normal for this date — 60-year average.
0.06Crystal Lake, Friday, 4 December
Climate normal for this date — 60-year average.
0.08Crystal Lake, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06Crystal Lake, Sunday, 6 December
Climate normal for this date — 60-year average.
0.12Crystal Lake, Monday, 7 December
Climate normal for this date — 60-year average.
0.07Crystal Lake, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.09Crystal Lake, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.09Crystal Lake, Thursday, 10 December
Climate normal for this date — 60-year average.
0.1Crystal Lake, Friday, 11 December
Climate normal for this date — 60-year average.
0.08Crystal Lake, Saturday, 12 December
Climate normal for this date — 60-year average.
0.06Crystal Lake, Sunday, 13 December
Climate normal for this date — 60-year average.
0.11Crystal Lake, Monday, 14 December
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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