September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Holyrood: typically 27.8°C by day, 13.3°C at night, with 66 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
June · September · July
October · April · May
The weakest month is January, scoring 5 against September’s 79 — days reach only 5.4°C, 19° below the 24°C the score treats as ideal, and nights drop to -8.1°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 | 5.4°C | -8.1°C | 20 mm | 3 | 9 h 45 | 5 | Good coverage |
| February | 7.4°C | -6.9°C | 28 mm | 3.3 | 10 h 41 | 5 | Good coverage |
| March | 14.3°C | -0.8°C | 49 mm | 5 | 11 h 50 | 36 | Strong coverage |
| April | 19.9°C | 4.1°C | 56 mm | 6 | 13 h 09 | 61 | Good coverage |
| May | 24.5°C | 10.5°C | 130 mm | 8.1 | 14 h 15 | 72 | Strong coverage |
| June | 30.7°C | 16.8°C | 98 mm | 6.9 | 14 h 51 | 62 | Strong coverage |
| July | 33.6°C | 19.5°C | 98 mm | 7.6 | 14 h 37 | 47 | Strong coverage |
| August | 32.3°C | 18.2°C | 106 mm | 6.8 | 13 h 40 | 54 | Strong coverage |
| September | 27.8°C | 13.3°C | 66 mm | 4.5 | 12 h 23 | 79 | Strong coverage |
| October | 20.7°C | 5.6°C | 63 mm | 4.6 | 11 h 07 | 67 | Strong coverage |
| November | 13.1°C | -1.5°C | 28 mm | 3.4 | 10 h 01 | 34 | Good coverage |
| December | 6.4°C | -6.7°C | 27 mm | 3.2 | 9 h 29 | 5 | Strong coverage |
What has changed
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.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 28.3°C28 Jan 2015 | -34.4°C8 Jan 1913 | 45 mm16 Jan 2017 | 58 mm1949 · driest 0 mm in 1923 | 115 |
| February | 31.7°C29 Feb 1972 | -33.3°C13 Feb 1905 | 52 mm27 Feb 1948 | 117 mm1911 · driest 0 mm in 2006 | 115 |
| March | 36.7°C21 Mar 1907 | -26.7°C11 Mar 1948 | 102 mm28 Mar 1914 | 231 mm1973 · driest 0 mm in 1936 | 117 |
| April | 38.3°C23 Apr 1989 | -13.9°C5 Apr 1920 | 83 mm13 Apr 1955 | 165 mm1944 · driest 2 mm in 2022 | 116 |
| May | 42.2°C23 May 1939 | -8.3°C1 May 1909 | 184 mm24 May 2007 | 447 mm2007 · driest 0 mm in 1966 | 119 |
| June | 46.1°C25 Jun 1911 | 4.4°C2 Jun 1969 | 120 mm10 Jun 2014 | 318 mm2022 · driest 0 mm in 2016 | 118 |
| July | 46.7°C24 Jul 1936 | 6.1°C14 Jul 1990 | 135 mm25 Jul 1990 | 285 mm1993 · driest 3 mm in 1913 | 118 |
| August | 47.2°C13 Aug 1936 | 4.4°C26 Aug 1910 | 111 mm31 Aug 2016 | 264 mm1927 · driest 3 mm in 2000 | 116 |
| September | 45.6°C3 Sep 1947 | -4.4°C30 Sep 1984 | 149 mm19 Sep 1967 | 346 mm1967 · driest 1 mm in 1947 | 116 |
| October | 38.9°C5 Oct 1947 | -13.3°C30 Oct 1917 | 174 mm10 Oct 2018 | 216 mm2018 · driest 0 mm in 1952 | 117 |
| November | 31.1°C1 Nov 1950 | -21.7°C22 Nov 1929 | 59 mm12 Nov 2010 | 135 mm1909 · driest 0 mm in 1965 | 116 |
| December | 26.7°C6 Dec 1939 | -33.3°C23 Dec 1989 | 62 mm15 Dec 1984 | 105 mm1913 · driest 0 mm in 2015 | 116 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | <1 | 2 |
| February | <1 | 0 | 24 | 1 | 2 |
| March | 3 | <1 | 17 | 2 | 1 |
| April | 7 | 2 | 7 | 2 | <1 |
| May | 16 | 6 | <1 | 4 | 0 |
| June | 27 | 19 | 0 | 3 | 0 |
| July | 30 | 25 | 0 | 3 | 0 |
| August | 29 | 23 | 0 | 3 | 0 |
| September | 22 | 11 | <1 | 2 | 0 |
| October | 9 | 3 | 6 | 2 | <1 |
| November | 1 | 0 | 18 | <1 | <1 |
| December | 0 | 0 | 27 | 1 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 79); on 2011–2025 it is September (77). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 9% | 2% | 4% | 1.0–9.6°C |
| February | 8% | 12% | 3% | 8% | 3.1–13.1°C |
| March | 25% | 16% | 5% | 14% | 9.7–19.0°C |
| April | 48% | 20% | 7% | 20% | 17.5–23.2°C |
| May | 64% | 26% | 11% | 30% | 22.7–27.4°C |
| June | 74% | 25% | 11% | 25% | 28.3–34.3°C |
| July | 80% | 20% | 9% | 18% | 31.7–37.3°C |
| August | 80% | 20% | 9% | 16% | 30.8–36.4°C |
| September | 79% | 17% | 7% | 14% | 25.9–31.5°C |
| October | 60% | 14% | 5% | 10% | 19.0–25.1°C |
| November | 19% | 11% | 3% | 6% | 10.3–16.5°C |
| December | 2% | 10% | 2% | 4% | 3.5–10.0°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