Weather in Groton, SD
Groton, Saturday, 8 August, 22:32
Mostly clear. Feels like 71°. High 86°, low 56°.
Monthly outlook for Groton, SD: average high 86.7°, average low 61°. That is 3.4° above the climate normal for August. Precipitation is expected on 4 days (about 0.6 inches), against a normal of 4 days and 1.5 inches. The warmest day looks like 10 August (97.8°), the coolest 23 August (55°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 87.4° | 80.8° | +3.7° |
| 18 August – 27 August | 85.6° | 80.4° | +2.9° |
| 28 August – 6 September | at normal | 78.9° | — |
August records over 66 years
0.18
Groton, Sunday, 9 August
Rain. High 86°, low 59°.
0.23Groton, Monday, 10 August
Rain. High 98°, low 58°.
0.06Groton, Tuesday, 11 August
Light rain. High 90°, low 62°.
0
Groton, Wednesday, 12 August
Overcast. High 88°, low 62°.
0Groton, Thursday, 13 August
Overcast. High 84°, low 68°.
0
Groton, Friday, 14 August
Partly cloudy. High 89°, low 61°.
0.02Groton, Saturday, 15 August
Light rain. High 71°, low 66°.
0Groton, Sunday, 16 August
Overcast. High 87°, low 63°.
0Groton, Monday, 17 August
Partly cloudy. High 95°, low 62°.
0Groton, Tuesday, 18 August
Partly cloudy. High 92°, low 66°.
0.03Groton, Wednesday, 19 August
Light rain. High 82°, low 55°.
0.01Groton, Thursday, 20 August
Light rain. High 80°, low 62°.
0.1Groton, Friday, 21 August
Light rain. High 88°, low 58°.
0.01Groton, Saturday, 22 August
Light rain. High 84°, low 62°.
0
Groton, Sunday, 23 August
Clear. High 87°, low 55°.
0.04Groton, Monday, 24 August
Climate normal for this date — 60-year average.
0.04Groton, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.09Groton, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.05Groton, Thursday, 27 August
Climate normal for this date — 60-year average.
0.07Groton, Friday, 28 August
Climate normal for this date — 60-year average.
0.05
Groton, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Groton, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Groton, Monday, 31 August
Climate normal for this date — 60-year average.
0.07Groton, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.15Groton, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.06Groton, Thursday, 3 September
Climate normal for this date — 60-year average.
0.07Groton, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Groton, Saturday, 5 September
Climate normal for this date — 60-year average.
0.07Groton, Sunday, 6 September
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 Groton, 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 Groton, 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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