Weather in Gretna, SD
Gretna, Tuesday, 20 October, 05:17
Clear. Feels like 37°. High 69°, low 42°.
Monthly outlook for Gretna, SD: average high 56.1°, average low 37.1°. That is 2.8° above the climate normal for October. Precipitation is expected on 0 days (about 0.1 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 22 October (73.2°), the coolest 28 October (22.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 57.2° | 53.1° | +2.3° |
| 30 October – 8 November | 54.3° | 46.7° | +4.2° |
| 9 November – 18 November | at normal | 40° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Roscoe (9 mi).
0
Gretna, Wednesday, 21 October
Partly cloudy. High 65°, low 43°.
0
Gretna, Thursday, 22 October
Clear. High 73°, low 50°.
0.02
Gretna, Friday, 23 October
Light rain. High 68°, low 58°.
0.02Gretna, Saturday, 24 October
Light rain. High 66°, low 45°.
0Gretna, Sunday, 25 October
Clear. High 52°, low 35°.
0
Gretna, Monday, 26 October
Overcast. High 44°, low 35°.
0Gretna, Tuesday, 27 October
Clear. High 35°, low 25°.
0Gretna, Wednesday, 28 October
Partly cloudy. High 49°, low 23°.
0Gretna, Thursday, 29 October
Clear. High 50°, low 30°.
0Gretna, Friday, 30 October
Partly cloudy. High 48°, low 28°.
0Gretna, Saturday, 31 October
Clear. High 46°, low 29°.
0.02Gretna, Sunday, 1 November
Light rain. High 45°, low 27°.
0Gretna, Monday, 2 November
Overcast. High 63°, low 41°.
0Gretna, Tuesday, 3 November
Clear. High 58°, low 39°.
0Gretna, Wednesday, 4 November
Overcast. High 66°, low 42°.
0.04
Gretna, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Gretna, Friday, 6 November
Climate normal for this date — 60-year average.
0.04Gretna, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Gretna, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Gretna, Monday, 9 November
Climate normal for this date — 60-year average.
0.06Gretna, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.02Gretna, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.04Gretna, Thursday, 12 November
Climate normal for this date — 60-year average.
0.03Gretna, Friday, 13 November
Climate normal for this date — 60-year average.
0.02Gretna, Saturday, 14 November
Climate normal for this date — 60-year average.
0.02Gretna, Sunday, 15 November
Climate normal for this date — 60-year average.
0.03Gretna, Monday, 16 November
Climate normal for this date — 60-year average.
0.02Gretna, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.04Gretna, Wednesday, 18 November
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, SD 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, SD 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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