Weather in Sylvan Lake, IL
Sylvan Lake, Saturday, 14 November, 22:26
Clear. Feels like 31°. High 45°, low 29°.
Monthly outlook for Sylvan Lake, IL: average high 48°, average low 34.3°. That is 2.6° above the climate normal for November. Precipitation is expected on 3 days (about 1.6 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 21 November (60.7°), the coolest 24 November (25.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 14 November – 23 November | 51.3° | 44.8° | +3.6° |
| 24 November – 3 December | 42.4° | 39.9° | +1.4° |
| 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 51°, low 31°.
0Sylvan Lake, Monday, 16 November
Clear. High 51°, low 32°.
0
Sylvan Lake, Tuesday, 17 November
Mostly clear. High 53°, low 36°.
0
Sylvan Lake, Wednesday, 18 November
Overcast. High 54°, low 39°.
0Sylvan Lake, Thursday, 19 November
Overcast. High 57°, low 47°.
0Sylvan Lake, Friday, 20 November
Overcast. High 55°, low 36°.
0Sylvan Lake, Saturday, 21 November
Overcast. High 61°, low 52°.
0.34
Sylvan Lake, Sunday, 22 November
Snow. High 52°, low 30°.
0Sylvan Lake, Monday, 23 November
Overcast. High 34°, low 26°.
0Sylvan Lake, Tuesday, 24 November
Light snow. High 38°, low 25°.
0Sylvan Lake, Wednesday, 25 November
Overcast. High 38°, low 28°.
0Sylvan Lake, Thursday, 26 November
Overcast. High 42°, low 30°.
0.69
Sylvan Lake, Friday, 27 November
Rain. High 49°, low 38°.
0.54Sylvan Lake, Saturday, 28 November
Snow. High 49°, low 36°.
0.03Sylvan Lake, Sunday, 29 November
Light snow. High 39°, low 34°.
0.07
Sylvan 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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