Weather in Sylvan Lake, IL
Sylvan Lake, Thursday, 12 November, 18:31
Overcast. Feels like 29°. High 44°, low 39°.
Monthly outlook for Sylvan Lake, IL: average high 49°, average low 39°. That is 2.7° above the climate normal for November. Precipitation is expected on 5 days (about 1.1 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 24 November (60.7°), the coolest 27 November (26.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 November – 21 November | 50.2° | 45.2° | +2.8° |
| 22 November – 1 December | 46.9° | 40.9° | +3.3° |
| 2 December – 11 December | at normal | 35.9° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (9 mi).
0Sylvan Lake, Friday, 13 November
Overcast. High 42°, low 34°.
0
Sylvan Lake, Saturday, 14 November
Clear. High 44°, low 30°.
0Sylvan Lake, Sunday, 15 November
Clear. High 46°, low 30°.
0Sylvan Lake, Monday, 16 November
Clear. High 49°, low 31°.
0Sylvan Lake, Tuesday, 17 November
Clear. High 50°, low 34°.
0Sylvan Lake, Wednesday, 18 November
Overcast. High 55°, low 37°.
0.17
Sylvan Lake, Thursday, 19 November
Light rain. High 59°, low 49°.
0.04Sylvan Lake, Friday, 20 November
Light rain. High 54°, low 51°.
0.19Sylvan Lake, Saturday, 21 November
Light rain. High 61°, low 51°.
0.02Sylvan Lake, Sunday, 22 November
Light rain. High 58°, low 53°.
0.45Sylvan Lake, Monday, 23 November
Rain. High 60°, low 58°.
0.17Sylvan Lake, Tuesday, 24 November
Rain. High 61°, low 40°.
0Sylvan Lake, Wednesday, 25 November
Clear. High 37°, low 32°.
0.03
Sylvan Lake, Thursday, 26 November
Light snow. High 34°, low 29°.
0Sylvan Lake, Friday, 27 November
Clear. High 31°, low 26°.
0.12
Sylvan Lake, Saturday, 28 November
Climate normal for this date — 60-year average.
0.08Sylvan Lake, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07
Sylvan Lake, Monday, 30 November
Climate normal for this date — 60-year average.
0.14Sylvan Lake, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.07Sylvan Lake, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Thursday, 3 December
Climate normal for this date — 60-year average.
0.06Sylvan Lake, Friday, 4 December
Climate normal for this date — 60-year average.
0.07Sylvan Lake, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06Sylvan Lake, Sunday, 6 December
Climate normal for this date — 60-year average.
0.11Sylvan Lake, Monday, 7 December
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Thursday, 10 December
Climate normal for this date — 60-year average.
0.11Sylvan Lake, Friday, 11 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 Sylvan 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 Sylvan 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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