September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Montrose: typically 25.8°C by day, 8.6°C at night, with 31 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · June · July
May · October · September
The weakest month is January, scoring 5 against September’s 80 — days reach only 4°C, 20° below the 24°C the score treats as ideal, and nights drop to -8.5°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 | 4°C | -8.5°C | 12 mm | 3.2 | 9 h 45 | 5 | Strong coverage |
| February | 7.5°C | -5.7°C | 12 mm | 3.2 | 10 h 42 | 8 | Strong coverage |
| March | 13.2°C | -1.6°C | 17 mm | 4 | 11 h 50 | 34 | Strong coverage |
| April | 17.3°C | 1.8°C | 19 mm | 4 | 13 h 09 | 53 | Strong coverage |
| May | 22.7°C | 6.3°C | 21 mm | 4.2 | 14 h 14 | 79 | Strong coverage |
| June | 29.2°C | 11°C | 12 mm | 2.5 | 14 h 50 | 76 | Strong coverage |
| July | 31.8°C | 14.1°C | 23 mm | 4.2 | 14 h 36 | 72 | Strong coverage |
| August | 30.1°C | 13.2°C | 28 mm | 5.7 | 13 h 39 | 74 | Strong coverage |
| September | 25.8°C | 8.6°C | 31 mm | 5.4 | 12 h 23 | 80 | Strong coverage |
| October | 18.6°C | 2.3°C | 26 mm | 4.8 | 11 h 08 | 58 | Strong coverage |
| November | 10.7°C | -3.4°C | 16 mm | 3.4 | 10 h 02 | 23 | Strong coverage |
| December | 4.1°C | -8.4°C | 14 mm | 3.5 | 9 h 30 | 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 | 19.4°C30 Jan 1903 | -31.7°C7 Jan 1913 | 35 mm14 Jan 1960 | 50 mm1974 · driest 0 mm in 2018 | 125 |
| February | 32.2°C27 Feb 1907 | -32.8°C13 Feb 1905 | 38 mm11 Feb 1896 | 64 mm1896 · driest 0 mm in 1912 | 125 |
| March | 31.1°C22 Mar 2026 | -20.6°C19 Mar 1906 | 38 mm30 Mar 1897 | 87 mm1897 · driest 0 mm in 1934 | 125 |
| April | 31.7°C30 Apr 1943 | -16.7°C4 Apr 1945 | 34 mm19 Apr 1990 | 72 mm2004 · driest 0 mm in 1963 | 123 |
| May | 33.9°C30 May 2000 | -8.3°C1 May 1909 | 28 mm24 May 1906 | 70 mm1928 · driest 0 mm in 1918 | 123 |
| June | 38.9°C19 Jun 1936 | -2.8°C1 Jun 1919 | 27 mm21 Jun 1967 | 64 mm1947 · driest 0 mm in 1980 | 124 |
| July | 39.4°C9 Jul 2021 | 1.7°C1 Jul 1968 | 38 mm21 Jul 1983 | 76 mm1983 · driest 1 mm in 1958 | 124 |
| August | 41.1°C1 Aug 1947 | 2.8°C26 Aug 1910 | 33 mm22 Aug 1993 | 87 mm1943 · driest 1 mm in 2019 | 124 |
| September | 36.1°C6 Sep 2020 | -6.1°C27 Sep 1908 | 38 mm6 Sep 1970 | 108 mm1938 · driest 0 mm in 1979 | 124 |
| October | 31.1°C2 Oct 2015 | -15.0°C27 Oct 2020 | 43 mm20 Oct 1963 | 82 mm2006 · driest 0 mm in 1999 | 125 |
| November | 25.0°C2 Nov 2014 | -22.2°C27 Nov 1952 | 39 mm1 Nov 1986 | 70 mm1986 · driest 0 mm in 2018 | 124 |
| December | 20.0°C11 Dec 1939 | -29.4°C25 Dec 1924 | 22 mm4 Dec 1960 | 55 mm2007 · driest 0 mm in 1976 | 124 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 3 |
| February | 0 | 0 | 26 | <1 | 2 |
| March | <1 | 0 | 21 | <1 | 1 |
| April | 2 | 0 | 11 | <1 | <1 |
| May | 13 | 2 | 2 | <1 | <1 |
| June | 26 | 16 | 0 | <1 | 0 |
| July | 30 | 24 | 0 | <1 | 0 |
| August | 29 | 18 | 0 | <1 | 0 |
| September | 20 | 5 | <1 | <1 | 0 |
| October | 4 | <1 | 9 | <1 | <1 |
| November | 0 | 0 | 24 | <1 | 1 |
| December | 0 | 0 | 29 | <1 | 3 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 83); on 2011–2025 it is May (82). 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 | 0% | 12% | <1% | 6% | 0.0–6.6°C |
| February | <1% | 12% | <1% | 6% | 3.9–10.4°C |
| March | 7% | 13% | 1% | 9% | 9.1–15.0°C |
| April | 35% | 14% | 2% | 10% | 14.5–19.4°C |
| May | 67% | 14% | 2% | 12% | 19.8–24.9°C |
| June | 89% | 9% | <1% | 5% | 26.1–31.4°C |
| July | 85% | 15% | 2% | 13% | 29.4–33.3°C |
| August | 81% | 19% | 2% | 18% | 28.2–31.6°C |
| September | 78% | 16% | 2% | 14% | 23.6–27.9°C |
| October | 45% | 14% | 2% | 10% | 16.4–21.4°C |
| November | 3% | 12% | 1% | 7% | 7.4–13.2°C |
| December | 0% | 12% | <1% | 7% | 1.2–7.5°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