Weather in Groton, CT
Groton, Sunday, 11 October, 04:14
Overcast. Feels like 46°. High 59°, low 47°.
Monthly outlook for Groton, CT: average high 59°, average low 44.1°. That is 1.2° below the climate normal for October. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 14 October (77.7°), the coolest 19 October (34.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 61.6° | 61.9° | -0.2° |
| 21 October – 30 October | 54.8° | 58.9° | -2.3° |
| 31 October – 9 November | at normal | 56° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Fishers Island (7 mi).
0.22
Groton, Monday, 12 October
Rain. High 71°, low 47°.
0Groton, Tuesday, 13 October
Overcast. High 64°, low 53°.
0Groton, Wednesday, 14 October
Overcast. High 78°, low 60°.
0
Groton, Thursday, 15 October
Partly cloudy. High 60°, low 46°.
0.15Groton, Friday, 16 October
Light rain. High 65°, low 41°.
0.06Groton, Saturday, 17 October
Light rain. High 66°, low 50°.
0Groton, Sunday, 18 October
Overcast. High 48°, low 37°.
0
Groton, Monday, 19 October
Clear. High 50°, low 34°.
0Groton, Tuesday, 20 October
Clear. High 55°, low 37°.
0Groton, Wednesday, 21 October
Clear. High 55°, low 42°.
0Groton, Thursday, 22 October
Overcast. High 61°, low 51°.
0Groton, Friday, 23 October
Partly cloudy. High 63°, low 47°.
0Groton, Saturday, 24 October
Clear. High 50°, low 39°.
0.04Groton, Sunday, 25 October
Light rain. High 49°, low 35°.
0.03Groton, Monday, 26 October
Light rain. High 50°, low 39°.
0.15Groton, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.16Groton, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.17Groton, Thursday, 29 October
Climate normal for this date — 60-year average.
0.17Groton, Friday, 30 October
Climate normal for this date — 60-year average.
0.08Groton, Saturday, 31 October
Climate normal for this date — 60-year average.
0.11Groton, 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.
0.15
Groton, Thursday, 5 November
Climate normal for this date — 60-year average.
0.13Groton, Friday, 6 November
Climate normal for this date — 60-year average.
0.08Groton, Saturday, 7 November
Climate normal for this date — 60-year average.
0.12Groton, Sunday, 8 November
Climate normal for this date — 60-year average.
0.09Groton, 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, CT 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, CT 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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