Weather in Gretna, IL
Gretna, Thursday, 12 November, 09:51
Overcast. Feels like 32°. High 44°, low 38°.
Monthly outlook for Gretna, IL: average high 49.6°, average low 37.8°. That is 2.5° above the climate normal for November. Precipitation is expected on 7 days (about 3.8 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 20 November (60.4°), the coolest 26 November (27.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 November – 21 November | 50.1° | 46.3° | +2.1° |
| 22 November – 1 December | 48.7° | 41.7° | +3.9° |
| 2 December – 11 December | at normal | 36.5° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0Gretna, Friday, 13 November
Overcast. High 42°, low 36°.
0
Gretna, Saturday, 14 November
Clear. High 43°, low 30°.
0Gretna, Sunday, 15 November
Clear. High 45°, low 29°.
0Gretna, Monday, 16 November
Clear. High 48°, low 29°.
0
Gretna, Tuesday, 17 November
Mostly clear. High 50°, low 31°.
0Gretna, Wednesday, 18 November
Overcast. High 55°, low 38°.
0.04
Gretna, Thursday, 19 November
Light rain. High 60°, low 47°.
0.1Gretna, Friday, 20 November
Light rain. High 60°, low 47°.
1.02Gretna, Saturday, 21 November
Rain. High 53°, low 46°.
0.99Gretna, Sunday, 22 November
Rain. High 57°, low 53°.
0.69Gretna, Monday, 23 November
Rain. High 53°, low 50°.
0.37Gretna, Tuesday, 24 November
Rain. High 57°, low 37°.
0Gretna, Wednesday, 25 November
Overcast. High 37°, low 29°.
0.01
Gretna, Thursday, 26 November
Light snow. High 35°, low 27°.
0.53Gretna, Friday, 27 November
Snow. High 54°, low 36°.
0.11
Gretna, Saturday, 28 November
Climate normal for this date — 60-year average.
0.06Gretna, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07Gretna, Monday, 30 November
Climate normal for this date — 60-year average.
0.15
Gretna, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.06Gretna, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.08Gretna, Thursday, 3 December
Climate normal for this date — 60-year average.
0.06Gretna, Friday, 4 December
Climate normal for this date — 60-year average.
0.08Gretna, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06Gretna, Sunday, 6 December
Climate normal for this date — 60-year average.
0.12Gretna, Monday, 7 December
Climate normal for this date — 60-year average.
0.07Gretna, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.08Gretna, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.09Gretna, Thursday, 10 December
Climate normal for this date — 60-year average.
0.11Gretna, 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 Gretna, 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 Gretna, 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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