Weather in Groton, MA
Groton, Saturday, 17 October, 02:50
Overcast. Feels like 50°. High 54°, low 33°.
Monthly outlook for Groton, MA: average high 56.7°, average low 40.4°. That is 0.2° below the climate normal for October. Precipitation is expected on 4 days (about 1.2 inches), against a normal of 4 days and 2.0 inches. The warmest day looks like 25 October (62.9°), the coolest 18 October (32.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 57.5° | 58.2° | -0.4° |
| 27 October – 5 November | 55.2° | 54.8° | +0.2° |
| 6 November – 15 November | at normal | 49.9° | — |
October records over 66 years
0
Groton, Sunday, 18 October
Clear. High 55°, low 33°.
0Groton, Monday, 19 October
Overcast. High 60°, low 35°.
0Groton, Tuesday, 20 October
Overcast. High 63°, low 40°.
0Groton, Wednesday, 21 October
Clear. High 56°, low 41°.
0Groton, Thursday, 22 October
Clear. High 56°, low 38°.
0Groton, Friday, 23 October
Clear. High 59°, low 36°.
0Groton, Saturday, 24 October
Clear. High 57°, low 37°.
0
Groton, Sunday, 25 October
Mostly clear. High 63°, low 40°.
0Groton, Monday, 26 October
Mostly clear. High 53°, low 41°.
0Groton, Tuesday, 27 October
Overcast. High 57°, low 36°.
0.08
Groton, Wednesday, 28 October
Light rain. High 54°, low 43°.
0Groton, Thursday, 29 October
Overcast. High 56°, low 44°.
0.2Groton, Friday, 30 October
Light rain. High 53°, low 42°.
0.41Groton, Saturday, 31 October
Rain. High 56°, low 51°.
0.56Groton, Sunday, 1 November
Rain. High 56°, low 54°.
0.09
Groton, Monday, 2 November
Climate normal for this date — 60-year average.
0.17
Groton, 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.
0.11Groton, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.13Groton, Thursday, 12 November
Climate normal for this date — 60-year average.
0.15Groton, Friday, 13 November
Climate normal for this date — 60-year average.
0.12Groton, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Groton, Sunday, 15 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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