Groton weather in October: Groton, Connecticut: normal highs, lows, rain and records for October
Groton in October has a normal high of 63°F and a normal low of 46°F, a daily mean of 54°F, falling from 68°F on the 1st to 58°F by the 31st. Measurable precipitation falls on 10 days in a normal October, 3.66 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 17°C and low of 8°C, 93 mm of precipitation in October.
- NOAA stationGroton New London Airport
- Station IDUSW00014707
- Location41.33°N 72.05°W
- Elevation10 ft (3 m)
- Population10,160
- Jan 38° 23°
- Feb 40° 25°
- Mar 47° 31°
- Apr 56° 39°
- May 65° 49°
- Jun 74° 58°
- Jul 80° 65°
- Aug 79° 64°
- Sep 74° 57°
- Oct 63° 46°
- Nov 53° 37°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Groton in October?
The normal high is 63°F and the normal low 46°F, for a daily mean of 54.4°F. October is 10.8°F cooler than September and 9.3°F warmer than November. October is the 6th warmest month of the year in Groton and the 3rd wettest. Across the month the normal high falls 10°F, from 68°F on October 1 to 58°F on October 31. From one year to the next October's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 52°F and 57°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 68°F | 51°F | 31% | 16% |
| October 8 | 66°F | 48°F | 31% | 17% |
| October 15 | 63°F | 46°F | 31% | 17% |
| October 22 | 61°F | 43°F | 30% | 17% |
| October 31 | 58°F | 41°F | 30% | 17% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 68°F | 51°F | 31% | 16% | 11 h 50 min |
| October 2 | 68°F | 51°F | 31% | 17% | 11 h 50 min |
| October 3 | 68°F | 50°F | 31% | 17% | 11 h 40 min |
| October 4 | 67°F | 50°F | 31% | 17% | 11 h 40 min |
| October 5 | 67°F | 50°F | 31% | 17% | 11 h 40 min |
| October 6 | 67°F | 49°F | 31% | 17% | 11 h 40 min |
| October 7 | 66°F | 49°F | 31% | 17% | 11 h 30 min |
| October 8 | 66°F | 48°F | 31% | 17% | 11 h 30 min |
| October 9 | 66°F | 48°F | 31% | 17% | 11 h 30 min |
| October 10 | 65°F | 48°F | 31% | 17% | 11 h 20 min |
| October 11 | 65°F | 47°F | 31% | 17% | 11 h 20 min |
| October 12 | 64°F | 47°F | 31% | 17% | 11 h 20 min |
| October 13 | 64°F | 47°F | 31% | 17% | 11 h 20 min |
| October 14 | 64°F | 46°F | 31% | 17% | 11 h 10 min |
| October 15 | 63°F | 46°F | 31% | 17% | 11 h 10 min |
| October 16 | 63°F | 45°F | 31% | 17% | 11 h 10 min |
| October 17 | 63°F | 45°F | 31% | 17% | 11 h 10 min |
| October 18 | 63°F | 45°F | 30% | 17% | 11 h |
| October 19 | 62°F | 44°F | 30% | 17% | 11 h |
| October 20 | 62°F | 44°F | 30% | 17% | 11 h |
| October 21 | 62°F | 44°F | 30% | 17% | 10 h 50 min |
| October 22 | 61°F | 43°F | 30% | 17% | 10 h 50 min |
| October 23 | 61°F | 43°F | 30% | 17% | 10 h 50 min |
| October 24 | 61°F | 43°F | 30% | 17% | 10 h 50 min |
| October 25 | 60°F | 42°F | 30% | 17% | 10 h 40 min |
| October 26 | 60°F | 42°F | 30% | 17% | 10 h 40 min |
| October 27 | 60°F | 42°F | 30% | 17% | 10 h 40 min |
| October 28 | 59°F | 42°F | 30% | 17% | 10 h 40 min |
| October 29 | 59°F | 41°F | 30% | 17% | 10 h 30 min |
| October 30 | 59°F | 41°F | 30% | 17% | 10 h 30 min |
| October 31 | 58°F | 41°F | 30% | 17% | 10 h 30 min |
- Normal high
- 63°FOctober average
- Normal low
- 46°FOctober average
- Precipitation
- 3.66 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 2
- Daylight
- 11 h 50 min to 10 h 30 minOctober 1 to October 31
- Days at 70°F or more
- 6
- Sunshine
- 71%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014707; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Groton in October?
On a given October day the chance of 0.01 inch or more is 31% on average, highest around October 3 (31%). In all, 3.66 in falls on 10 days of a normal October, 1 of them with an inch or more.
In a normal October in Groton, 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014707.
What are the records for October in Groton?
The warmest October temperature on this station's record (since 1999) is 87°F, on October 2, 2019; the coldest is 24°F, on October 19, 2015. The wettest October brought 12.75 in (2005).
The October mean against the 1991-2020 normal of 54.4°F: 2021 58.4°F (+4.0), 2022 56.6°F (+2.2), 2023 58.4°F (+4.0), 2024 54.8°F (+0.4). 4 of 4 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.4°F | +4.0°F | 5.79 in |
| 2022 | 56.6°F | +2.2°F | 3.89 in |
| 2023 | 58.4°F | +4.0°F | – |
| 2024 | 54.8°F | +0.4°F | 0.95 in |
Source: records: ACIS, station USW00014707; recent months: ACIS, station USW00014707. Records and recent months use complete months only.
How does October in Groton compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, October normal highs run from 57°F in Norfolk to 64°F in Bridgeport; Groton's is 63°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.