October
October · April · May
United States · 1991–2020
October leads for comfortable weather in Hamilton: typically 26.3°C by day, 12.1°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.
October · April · May
September · August · June
November · March · April
The weakest month is January, scoring 31 against October’s 78 — days reach only 15.5°C, 8° below the 24°C the score treats as ideal, and nights drop to 1.7°C.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 15.5°C | 1.7°C | 119 mm | 8.3 | 10 h 13 | 31 | Good coverage |
| February | 17.3°C | 2.9°C | 121 mm | 7.3 | 10 h 58 | 40 | Good coverage |
| March | 21°C | 6.2°C | 137 mm | 7.8 | 11 h 53 | 56 | Good coverage |
| April | 24.8°C | 9.6°C | 108 mm | 7.5 | 12 h 57 | 73 | Good coverage |
| May | 28.5°C | 14.9°C | 114 mm | 7.1 | 13 h 49 | 70 | Good coverage |
| June | 31.7°C | 19.3°C | 118 mm | 8.9 | 14 h 18 | 50 | Good coverage |
| July | 33.1°C | 21°C | 124 mm | 9.6 | 14 h 07 | 41 | Good coverage |
| August | 33.2°C | 21°C | 97 mm | 9.1 | 13 h 21 | 45 | Good coverage |
| September | 30.5°C | 18.1°C | 104 mm | 5.9 | 12 h 20 | 61 | Good coverage |
| October | 26.3°C | 12.1°C | 83 mm | 5.5 | 11 h 19 | 78 | Good coverage |
| November | 20.3°C | 6.3°C | 117 mm | 6.9 | 10 h 26 | 57 | Good coverage |
| December | 16°C | 2.8°C | 144 mm | 8.2 | 10 h 00 | 32 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 27.2°C3 Jan 2022 | -11.7°C9 Jan 2017 | 86 mm24 Jan 2024 | 203 mm2020 · driest 19 mm in 2025 | 24 |
| February | 27.8°C23 Feb 2019 | -7.8°C4 Feb 2009 | 161 mm12 Feb 2024 | 314 mm2013 · driest 26 mm in 2012 | 25 |
| March | 32.8°C23 Mar 2026 | -9.4°C3 Mar 2006 | 95 mm9 Mar 2024 | 387 mm2001 · driest 9 mm in 2004 | 25 |
| April | 34.4°C7 Apr 2023 | -2.2°C9 Apr 2018 | 165 mm20 Apr 2020 | 280 mm2020 · driest 36 mm in 2012 | 26 |
| May | 36.7°C30 May 2006 | 0.6°C1 May 1999 | 98 mm24 May 2018 | 312 mm2018 · driest 13 mm in 2007 | 28 |
| June | 38.9°C30 Jun 2012 | 10.6°C21 Jun 2017 | 72 mm10 Jun 2019 | 222 mm2005 · driest 18 mm in 2008 | 28 |
| July | 40.0°C1 Jul 2012 | 11.7°C6 Jul 2008 | 68 mm26 Jul 2004 | 223 mm2024 · driest 49 mm in 2001 | 27 |
| August | 40.6°C11 Aug 2007 | 11.1°C31 Aug 2017 | 108 mm24 Aug 2008 | 230 mm2008 · driest 18 mm in 2002 | 25 |
| September | 36.7°C19 Sep 2010 | 7.8°C26 Sep 2001 | 167 mm20 Sep 2009 | 282 mm2009 · driest 9 mm in 2003 | 24 |
| October | 37.8°C5 Oct 2019 | -3.9°C23 Oct 2006 | 133 mm5 Oct 2021 | 231 mm2009 · driest 1 mm in 2024 | 23 |
| November | 32.2°C1 Nov 2016 | -7.8°C6 Nov 2006 | 84 mm10 Nov 2009 | 206 mm2009 · driest 8 mm in 2025 | 24 |
| December | 27.2°C11 Dec 2007 | -11.1°C29 Dec 2022 | 133 mm25 Dec 2015 | 478 mm2015 · driest 52 mm in 2001 | 26 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 13 | 4 |
| February | 1 | 0 | 9 | 4 |
| March | 8 | <1 | 4 | 3 |
| April | 15 | 1 | <1 | 3 |
| May | 24 | 10 | 0 | 3 |
| June | 27 | 21 | 0 | 4 |
| July | 28 | 25 | 0 | 4 |
| August | 29 | 26 | 0 | 3 |
| September | 26 | 17 | 0 | 3 |
| October | 20 | 5 | <1 | 2 |
| November | 4 | <1 | 3 | 3 |
| December | <1 | 0 | 11 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 14% | 28% | 13% | 29% | 13.1–17.5°C |
| February | 28% | 26% | 13% | 30% | 15.2–20.0°C |
| March | 51% | 25% | 13% | 25% | 18.5–24.1°C |
| April | 69% | 24% | 12% | 21% | 23.4–26.7°C |
| May | 74% | 25% | 12% | 28% | 27.3–29.7°C |
| June | 68% | 32% | 16% | 35% | 29.9–33.5°C |
| July | 67% | 33% | 16% | 36% | 31.7–34.5°C |
| August | 69% | 31% | 11% | 31% | 31.5–34.8°C |
| September | 79% | 21% | 9% | 16% | 28.6–33.0°C |
| October | 77% | 19% | 8% | 22% | 24.5–27.4°C |
| November | 46% | 23% | 12% | 22% | 18.0–22.8°C |
| December | 19% | 27% | 14% | 30% | 14.2–19.0°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