Weather in Gretna, SD
Gretna, Monday, 19 October, 20:26
Clear. Feels like 48°. High 65°, low 34°.
Monthly outlook for Gretna, SD: average high 57.5°, average low 39.1°. That is 3.2° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 22 October (71°), the coolest 28 October (22.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 57.8° | 53.8° | +2.2° |
| 29 October – 7 November | 56.9° | 47.3° | +5.4° |
| 8 November – 17 November | at normal | 40.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Roscoe (9 mi).
0
Gretna, Tuesday, 20 October
Clear. High 68°, low 42°.
0
Gretna, Wednesday, 21 October
Partly cloudy. High 64°, low 42°.
0Gretna, Thursday, 22 October
Clear. High 71°, low 50°.
0.01
Gretna, Friday, 23 October
Light rain. High 66°, low 59°.
0
Gretna, Saturday, 24 October
Overcast. High 62°, low 47°.
0Gretna, Sunday, 25 October
Partly cloudy. High 54°, low 40°.
0
Gretna, Monday, 26 October
Mostly clear. High 48°, low 31°.
0
Gretna, Tuesday, 27 October
Light snow. High 37°, low 27°.
0Gretna, Wednesday, 28 October
Clear. High 43°, low 22°.
0Gretna, Thursday, 29 October
Mostly clear. High 55°, low 28°.
0Gretna, Friday, 30 October
Overcast. High 59°, low 37°.
0Gretna, Saturday, 31 October
Overcast. High 65°, low 45°.
0Gretna, Sunday, 1 November
Overcast. High 47°, low 38°.
0Gretna, Monday, 2 November
Partly cloudy. High 55°, low 38°.
0.04Gretna, Tuesday, 3 November
Light rain. High 60°, low 45°.
0.01Gretna, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.04Gretna, 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.
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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