Weather in Sylvan Lake, IL
Sylvan Lake, Friday, 13 November, 17:21
Mostly clear. Feels like 31°. High 42°, low 33°.
Monthly outlook for Sylvan Lake, IL: average high 44.5°, average low 31.3°. That is 0.5° above the climate normal for November. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 21 November (59.4°), the coolest 24 November (20.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 November – 22 November | 49.5° | 45° | +2.5° |
| 23 November – 2 December | 36.1° | 40.4° | -2.4° |
| 3 December – 12 December | at normal | 35.6° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (9 mi).
0
Sylvan Lake, Saturday, 14 November
Clear. High 48°, low 32°.
0Sylvan Lake, Sunday, 15 November
Clear. High 47°, low 31°.
0
Sylvan Lake, Monday, 16 November
Mostly clear. High 49°, low 31°.
0
Sylvan Lake, Tuesday, 17 November
Overcast. High 51°, low 36°.
0Sylvan Lake, Wednesday, 18 November
Overcast. High 53°, low 36°.
0.21
Sylvan Lake, Thursday, 19 November
Rain. High 53°, low 43°.
0.16Sylvan Lake, Friday, 20 November
Rain. High 57°, low 41°.
0.02Sylvan Lake, Saturday, 21 November
Light rain. High 59°, low 40°.
0Sylvan Lake, Sunday, 22 November
Overcast. High 37°, low 26°.
0
Sylvan Lake, Monday, 23 November
Light snow. High 28°, low 21°.
0Sylvan Lake, Tuesday, 24 November
Overcast. High 30°, low 20°.
0
Sylvan Lake, Wednesday, 25 November
Partly cloudy. High 33°, low 21°.
0Sylvan Lake, Thursday, 26 November
Overcast. High 39°, low 27°.
0Sylvan Lake, Friday, 27 November
Overcast. High 43°, low 31°.
0Sylvan Lake, Saturday, 28 November
Overcast. High 44°, low 32°.
0.08
Sylvan Lake, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07Sylvan 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.
0.09Sylvan Lake, Saturday, 12 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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