Weather in Sylvan Lake, IL
Sylvan Lake, Saturday, 14 November, 08:03
Partly cloudy. Feels like 24°. High 47°, low 30°.
Monthly outlook for Sylvan Lake, IL: average high 49.7°, average low 36.6°. That is 3.5° above the climate normal for November. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 21 November (62.9°), the coolest 23 November (24.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 14 November – 23 November | 50.9° | 44.8° | +3.4° |
| 24 November – 3 December | 47.5° | 39.9° | +4.2° |
| 4 December – 13 December | at normal | 35.3° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (9 mi).
0
Sylvan Lake, Sunday, 15 November
Clear. High 48°, low 31°.
0Sylvan Lake, Monday, 16 November
Clear. High 49°, low 31°.
0Sylvan Lake, Tuesday, 17 November
Partly cloudy. High 51°, low 34°.
0
Sylvan Lake, Wednesday, 18 November
Overcast. High 54°, low 38°.
0.05
Sylvan Lake, Thursday, 19 November
Light rain. High 56°, low 47°.
0Sylvan Lake, Friday, 20 November
Overcast. High 55°, low 41°.
0.03Sylvan Lake, Saturday, 21 November
Light rain. High 63°, low 55°.
0.05Sylvan Lake, Sunday, 22 November
Light rain. High 49°, low 33°.
0Sylvan Lake, Monday, 23 November
Clear. High 38°, low 25°.
0Sylvan Lake, Tuesday, 24 November
Overcast. High 40°, low 26°.
0.07Sylvan Lake, Wednesday, 25 November
Light rain. High 42°, low 39°.
0.04Sylvan Lake, Thursday, 26 November
Light rain. High 49°, low 40°.
0Sylvan Lake, Friday, 27 November
Light rain. High 62°, low 51°.
0.61Sylvan Lake, Saturday, 28 November
Rain. High 59°, low 37°.
0Sylvan Lake, Sunday, 29 November
Overcast. High 33°, low 27°.
0.07Sylvan Lake, Monday, 30 November
Climate normal for this date — 60-year average.
0.14
Sylvan 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.
0.09Sylvan Lake, Saturday, 12 December
Climate normal for this date — 60-year average.
0.06Sylvan Lake, Sunday, 13 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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