Weather in Groton, MA
Groton, Sunday, 11 October, 01:20
Mostly clear. Feels like 42°. High 59°, low 40°.
Monthly outlook for Groton, MA: average high 58.5°, average low 39.3°. That is 0.4° below the climate normal for October. Precipitation is expected on 6 days (about 1.2 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 14 October (77.5°), the coolest 19 October (29.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 60.9° | 60° | +0.5° |
| 21 October – 30 October | 54.6° | 56.8° | -1.2° |
| 31 October – 9 November | at normal | 53.5° | — |
October records over 66 years
0.51
Groton, Monday, 12 October
Rain. High 72°, low 44°.
0.07Groton, Tuesday, 13 October
Rain. High 62°, low 52°.
0.09Groton, Wednesday, 14 October
Light rain. High 78°, low 57°.
0
Groton, Thursday, 15 October
Mostly clear. High 57°, low 45°.
0.17Groton, Friday, 16 October
Rain. High 65°, low 40°.
0.16Groton, Saturday, 17 October
Light rain. High 66°, low 42°.
0
Groton, Sunday, 18 October
Overcast. High 46°, low 34°.
0
Groton, Monday, 19 October
Clear. High 49°, low 30°.
0Groton, Tuesday, 20 October
Overcast. High 55°, low 31°.
0Groton, Wednesday, 21 October
Clear. High 58°, low 36°.
0Groton, Thursday, 22 October
Overcast. High 60°, low 41°.
0Groton, Friday, 23 October
Overcast. High 63°, low 43°.
0Groton, Saturday, 24 October
Clear. High 47°, low 34°.
0Groton, Sunday, 25 October
Clear. High 47°, low 30°.
0Groton, Monday, 26 October
Clear. High 52°, low 30°.
0.12
Groton, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.12
Groton, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.15Groton, Thursday, 29 October
Climate normal for this date — 60-year average.
0.16Groton, Friday, 30 October
Climate normal for this date — 60-year average.
0.09Groton, Saturday, 31 October
Climate normal for this date — 60-year average.
0.12Groton, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09Groton, Monday, 2 November
Climate normal for this date — 60-year average.
0.17Groton, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Groton, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.15Groton, Thursday, 5 November
Climate normal for this date — 60-year average.
0.13Groton, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Groton, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Groton, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1Groton, Monday, 9 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 Groton, MA 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, MA 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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