Groton weather in July: Groton, Connecticut: normal highs, lows, rain and records for July
Groton in July has a normal high of 80°F and a normal low of 65°F, a daily mean of 72°F, rising from 78°F on the 1st to 80°F by the 31st. Measurable precipitation falls on 10 days in a normal July, 3.24 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 18°C, 82 mm of precipitation in July.
- 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 July?
The normal high is 80°F and the normal low 65°F, for a daily mean of 72.3°F. July is 6.3°F warmer than June and 0.8°F warmer than August. July is the warmest month of the year in Groton and the 8th wettest. Across the month the normal high rises 2°F, from 78°F on July 1 to 80°F on July 31. From one year to the next July's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Julys in three average between 70°F and 75°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 78°F | 63°F | 31% | 17% |
| July 8 | 80°F | 64°F | 31% | 16% |
| July 15 | 80°F | 65°F | 31% | 15% |
| July 22 | 80°F | 66°F | 33% | 16% |
| July 31 | 80°F | 65°F | 33% | 16% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 17, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 78°F | 63°F | 31% | 17% | 15 h 10 min |
| July 2 | 79°F | 63°F | 31% | 17% | 15 h 10 min |
| July 3 | 79°F | 63°F | 31% | 17% | 15 h 10 min |
| July 4 | 79°F | 63°F | 31% | 16% | 15 h 10 min |
| July 5 | 79°F | 64°F | 31% | 16% | 15 h |
| July 6 | 79°F | 64°F | 31% | 16% | 15 h |
| July 7 | 79°F | 64°F | 31% | 16% | 15 h |
| July 8 | 80°F | 64°F | 31% | 16% | 15 h |
| July 9 | 80°F | 64°F | 31% | 16% | 15 h |
| July 10 | 80°F | 65°F | 31% | 16% | 15 h |
| July 11 | 80°F | 65°F | 31% | 16% | 15 h |
| July 12 | 80°F | 65°F | 31% | 15% | 15 h |
| July 13 | 80°F | 65°F | 31% | 15% | 15 h |
| July 14 | 80°F | 65°F | 31% | 15% | 15 h |
| July 15 | 80°F | 65°F | 31% | 15% | 14 h 50 min |
| July 16 | 80°F | 65°F | 31% | 15% | 14 h 50 min |
| July 17 | 80°F | 65°F | 32% | 16% | 14 h 50 min |
| July 18 | 80°F | 65°F | 32% | 16% | 14 h 50 min |
| July 19 | 80°F | 65°F | 32% | 16% | 14 h 50 min |
| July 20 | 80°F | 66°F | 32% | 16% | 14 h 50 min |
| July 21 | 80°F | 66°F | 32% | 16% | 14 h 40 min |
| July 22 | 80°F | 66°F | 33% | 16% | 14 h 40 min |
| July 23 | 80°F | 66°F | 33% | 16% | 14 h 40 min |
| July 24 | 80°F | 66°F | 33% | 16% | 14 h 40 min |
| July 25 | 80°F | 66°F | 33% | 16% | 14 h 40 min |
| July 26 | 80°F | 66°F | 33% | 16% | 14 h 40 min |
| July 27 | 80°F | 66°F | 33% | 16% | 14 h 30 min |
| July 28 | 80°F | 66°F | 33% | 16% | 14 h 30 min |
| July 29 | 80°F | 66°F | 33% | 16% | 14 h 30 min |
| July 30 | 80°F | 66°F | 33% | 16% | 14 h 30 min |
| July 31 | 80°F | 65°F | 33% | 16% | 14 h 30 min |
- Normal high
- 80°FJuly average
- Normal low
- 65°FJuly average
- Precipitation
- 3.24 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 15 h 10 min to 14 h 30 minJuly 1 to July 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 14
- Sunshine
- 79%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 July?
On a given July day the chance of 0.01 inch or more is 32% on average, highest around July 26 (33%). In all, 3.24 in falls on 10 days of a normal July, 1 of them with an inch or more.
In a normal July in Groton, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014707.
What are the records for July in Groton?
The warmest July temperature on this station's record (since 1999) is 101°F, on July 6, 2010; the coldest is 50°F, on July 11, 2002. The wettest July brought 9.68 in (2009).
The July mean against the 1991-2020 normal of 72.3°F: 2021 70.7°F (−1.6), 2022 75.3°F (+3.0), 2023 75.7°F (+3.4), 2024 74.4°F (+2.1), 2025 74.3°F (+2.0), 2026 71.7°F (−0.6). 4 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.7°F | −1.6°F | 4.42 in |
| 2022 | 75.3°F | +3.0°F | 1.35 in |
| 2023 | 75.7°F | +3.4°F | 5.40 in |
| 2024 | 74.4°F | +2.1°F | 3.91 in |
| 2025 | 74.3°F | +2.0°F | 0.00 in |
| 2026 | 71.7°F | −0.6°F | 5.64 in |
Source: records: ACIS, station USW00014707; recent months: ACIS, station USW00014707. Records and recent months use complete months only.
How does July in Groton compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, July normal highs run from 78°F in Norfolk to 85°F in Hartford; Groton's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.