May
May · September · October
77climate match
United States · 1991–2020
Best time to visit
Hartford.
May leads for comfortable weather in Hartford: typically 23.7°C by day, 12.7°C at night, with 130 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortMay
Typical high23.7°C
Typical low12.7°C
Rain in May130 mm
June
June · July · August
74climate match
October
October · April · May
83climate match
The weakest month is January, scoring 5 against May’s 77 — days reach only 4.4°C, 20° below the 24°C the score treats as ideal, and nights drop to -7.2°C.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
54.4° / -7.2°
Feb
77° / -5.2°
Mar
3413.3° / 0.6°
Apr
5719° / 6.5°
May
7723.7° / 12.7°
Jun
6329.1° / 18.2°
Jul
5031.8° / 20.7°
Aug
5531.4° / 19.5°
Sep
7626.7° / 14.4°
Oct
6520.3° / 7.3°
Nov
3512.6° / 0.8°
Dec
66.3° / -4.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 4.4°C | -7.2°C | 21 mm | 2.8 | 9 h 46 | 5 | Strong coverage |
| February | 7°C | -5.2°C | 37 mm | 3.4 | 10 h 42 | 7 | Strong coverage |
| March | 13.3°C | 0.6°C | 56 mm | 5.1 | 11 h 50 | 34 | Strong coverage |
| April | 19°C | 6.5°C | 90 mm | 7 | 13 h 08 | 57 | Strong coverage |
| May | 23.7°C | 12.7°C | 130 mm | 8.2 | 14 h 14 | 77 | Strong coverage |
| June | 29.1°C | 18.2°C | 112 mm | 6.7 | 14 h 49 | 63 | Strong coverage |
| July | 31.8°C | 20.7°C | 110 mm | 6.7 | 14 h 35 | 50 | Strong coverage |
| August | 31.4°C | 19.5°C | 106 mm | 6.4 | 13 h 39 | 55 | Strong coverage |
| September | 26.7°C | 14.4°C | 115 mm | 6.1 | 12 h 23 | 76 | Strong coverage |
| October | 20.3°C | 7.3°C | 85 mm | 5.1 | 11 h 08 | 65 | Strong coverage |
| November | 12.6°C | 0.8°C | 45 mm | 3.8 | 10 h 02 | 35 | Strong coverage |
| December | 6.3°C | -4.7°C | 36 mm | 3.2 | 9 h 31 | 6 | Strong coverage |
What has changed
Hartford runs +0.6°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+1.0
Feb
0.0
Mar
+1.6
Apr
-0.4
May
-0.3
Jun
+1.3
Jul
+0.4
Aug
+0.1
Sep
+1.5
Oct
+0.1
Nov
+0.1
Dec
+2.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.1°C29 Jan 2015 | -26.1°C10 Jan 1982 | 57 mm30 Jan 1982 | 75 mm2005 · driest 0 mm in 1976 | 66 |
| February | 28.9°C13 Feb 1962 | -30.0°C1 Feb 1979 | 60 mm21 Feb 1997 | 94 mm2001 · driest 0 mm in 1963 | 62 |
| March | 35.6°C22 Mar 2026 | -20.0°C3 Mar 2014 | 57 mm5 Mar 2026 | 194 mm1973 · driest 4 mm in 1976 | 64 |
| April | 35.0°C14 Apr 2006 | -10.6°C3 Apr 1975 | 100 mm27 Apr 2016 | 234 mm2009 · driest 9 mm in 1989 | 65 |
| May | 35.6°C27 May 1964 | -1.7°C2 May 1967 | 118 mm21 May 2019 | 386 mm2019 · driest 12 mm in 1998 | 65 |
| June | 41.7°C28 Jun 1980 | 3.9°C5 Jun 1998 | 147 mm8 Jun 1979 | 343 mm2005 · driest 3 mm in 2016 | 63 |
| July | 43.3°C30 Jul 2012 | 5.0°C13 Jul 1990 | 99 mm24 Jul 1968 | 315 mm1993 · driest 1 mm in 1975 | 63 |
| August | 43.3°C19 Aug 2023 | 8.3°C29 Aug 1988 | 149 mm31 Aug 2003 | 309 mm2019 · driest 2 mm in 2000 | 64 |
| September | 42.8°C3 Sep 2000 | -1.7°C29 Sep 1984 | 140 mm13 Sep 1961 | 289 mm1973 · driest 10 mm in 1984 | 62 |
| October | 36.1°C3 Oct 1963 | -10.6°C31 Oct 1993 | 172 mm31 Oct 1998 | 278 mm1998 · driest 4 mm in 1965 | 66 |
| November | 29.4°C9 Nov 2006 | -18.3°C27 Nov 1975 | 67 mm20 Nov 1994 | 168 mm1992 · driest 0 mm in 1989 | 64 |
| December | 24.4°C8 Dec 1966 | -29.4°C22 Dec 1989 | 48 mm26 Dec 2023 | 100 mm2015 · driest 1 mm in 1963 | 66 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 25 | <1 | <1 |
| February | 0 | 0 | 21 | 1 | <1 |
| March | 1 | <1 | 13 | 2 | <1 |
| April | 6 | <1 | 4 | 3 | 0 |
| May | 13 | 3 | <1 | 4 | 0 |
| June | 24 | 14 | 0 | 4 | 0 |
| July | 28 | 21 | 0 | 3 | 0 |
| August | 28 | 20 | 0 | 3 | 0 |
| September | 19 | 9 | 0 | 3 | 0 |
| October | 8 | 1 | 3 | 3 | 0 |
| November | <1 | 0 | 13 | 1 | <1 |
| December | 0 | 0 | 23 | 1 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 9% | 2% | 3% | 0.8–8.4°C |
| February | 5% | 12% | 3% | 6% | 2.2–11.6°C |
| March | 21% | 18% | 7% | 16% | 10.1–17.1°C |
| April | 41% | 23% | 10% | 23% | 16.6–22.6°C |
| May | 61% | 27% | 13% | 29% | 21.8–27.1°C |
| June | 76% | 24% | 13% | 24% | 26.9–31.7°C |
| July | 79% | 21% | 9% | 19% | 30.4–34.6°C |
| August | 79% | 21% | 10% | 21% | 28.9–34.2°C |
| September | 74% | 21% | 11% | 17% | 24.1–29.7°C |
| October | 52% | 17% | 9% | 16% | 18.6–23.5°C |
| November | 17% | 13% | 5% | 7% | 10.1–16.4°C |
| December | 2% | 10% | 3% | 4% | 3.1–9.4°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4272699
- NOAA station
- USC00144104 · JOHN REDMOND LAKE
- Station distance
- 18.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 38.31°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.