Weather in Groton, MA
Groton, Monday, 12 October, 14:04
Clear. Feels like 68°. High 69°, low 50°.
Monthly outlook for Groton, MA: average high 58.6°, average low 43.3°. That is 0.2° below the climate normal for October. Precipitation is expected on 6 days (about 1.4 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 14 October (75.7°), the coolest 18 October (33.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 59.8° | 60° | -0.1° |
| 22 October – 31 October | 56.7° | 56.2° | +0.3° |
| 1 November – 10 November | at normal | 53.2° | — |
October records over 66 years
0.13
Groton, Tuesday, 13 October
Light rain. High 58°, low 49°.
0.01Groton, Wednesday, 14 October
Light rain. High 76°, low 56°.
0
Groton, Thursday, 15 October
Partly cloudy. High 59°, low 47°.
0.27Groton, Friday, 16 October
Rain. High 54°, low 47°.
0Groton, Saturday, 17 October
Clear. High 47°, low 40°.
0
Groton, Sunday, 18 October
Overcast. High 53°, low 33°.
0Groton, Monday, 19 October
Clear. High 62°, low 39°.
0Groton, Tuesday, 20 October
Overcast. High 63°, low 48°.
0Groton, Wednesday, 21 October
Clear. High 58°, low 39°.
0Groton, Thursday, 22 October
Clear. High 53°, low 34°.
0.04Groton, Friday, 23 October
Light rain. High 57°, low 37°.
0Groton, Saturday, 24 October
Clear. High 57°, low 41°.
0.04Groton, Sunday, 25 October
Light rain. High 55°, low 39°.
0.3Groton, Monday, 26 October
Light rain. High 63°, low 51°.
0.01Groton, Tuesday, 27 October
Light rain. High 54°, low 43°.
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.
0.15Groton, Tuesday, 10 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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