September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Montrose: typically 23.9°C by day, 9.9°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
August · July · June
September · October · May
The weakest month is January, scoring 5 against September’s 77 — days reach only 4.1°C, 20° below the 24°C the score treats as ideal, and nights drop to -7.1°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 | 4.1°C | -7.1°C | 96 mm | 14.7 | 9 h 42 | 5 | Good coverage |
| February | 6.1°C | -6.4°C | 77 mm | 11.6 | 10 h 40 | 5 | Good coverage |
| March | 10.5°C | -2.9°C | 114 mm | 12.9 | 11 h 50 | 5 | Good coverage |
| April | 17.7°C | 2.1°C | 103 mm | 11.6 | 13 h 10 | 39 | Good coverage |
| May | 22°C | 7.2°C | 142 mm | 12.3 | 14 h 17 | 56 | Good coverage |
| June | 26.2°C | 12.8°C | 129 mm | 10.6 | 14 h 54 | 69 | Good coverage |
| July | 27.5°C | 14.7°C | 148 mm | 10.7 | 14 h 39 | 65 | Good coverage |
| August | 27.4°C | 14.2°C | 91 mm | 8.2 | 13 h 41 | 75 | Good coverage |
| September | 23.9°C | 9.9°C | 96 mm | 8.1 | 12 h 24 | 77 | Good coverage |
| October | 18.1°C | 3.2°C | 79 mm | 8.5 | 11 h 06 | 48 | Good coverage |
| November | 12.1°C | -1.1°C | 87 mm | 8.9 | 9 h 59 | 19 | Good coverage |
| December | 6.1°C | -5.1°C | 96 mm | 13.1 | 9 h 26 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C1 Jan 1973 | -31.7°C20 Jan 1994 | 42 mm1 Jan 1971 | 149 mm1979 · driest 26 mm in 1967 | 46 |
| February | 23.9°C27 Feb 2000 | -29.4°C5 Feb 1996 | 68 mm19 Feb 2000 | 149 mm1986 · driest 16 mm in 1993 | 48 |
| March | 30.0°C29 Mar 1989 | -23.3°C3 Mar 1980 | 58 mm6 Mar 1967 | 228 mm1967 · driest 19 mm in 1990 | 45 |
| April | 32.2°C3 Apr 2010 | -17.8°C8 Apr 1990 | 49 mm9 Apr 1980 | 189 mm2002 · driest 31 mm in 1971 | 45 |
| May | 32.8°C31 May 2006 | -7.2°C8 May 1995 | 97 mm17 May 1996 | 349 mm1996 · driest 29 mm in 1993 | 45 |
| June | 34.4°C9 Jun 1999 | -1.1°C8 Jun 1977 | 97 mm21 Jun 1964 | 296 mm1981 · driest 41 mm in 1988 | 45 |
| July | 37.2°C17 Jul 1988 | 1.7°C23 Jul 1985 | 98 mm24 Jul 1998 | 339 mm1996 · driest 61 mm in 1987 | 46 |
| August | 34.4°C18 Aug 1987 | 2.8°C29 Aug 1965 | 69 mm28 Aug 1994 | 212 mm1980 · driest 27 mm in 2002 | 46 |
| September | 33.9°C1 Sep 1973 | -1.7°C24 Sep 1974 | 73 mm29 Sep 1997 | 225 mm1993 · driest 20 mm in 1992 | 45 |
| October | 30.0°C13 Oct 2008 | -9.4°C29 Oct 1965 | 48 mm10 Oct 1979 | 198 mm1976 · driest 12 mm in 1964 | 45 |
| November | 28.3°C5 Nov 2003 | -16.7°C25 Nov 1970 | 94 mm6 Nov 1985 | 218 mm1985 · driest 16 mm in 2009 | 46 |
| December | 25.0°C10 Dec 1966 | -28.3°C22 Dec 1989 | 56 mm9 Dec 1972 | 200 mm1978 · driest 19 mm in 1989 | 48 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 24 | 3 | 9 |
| February | 0 | 0 | 23 | 2 | 6 |
| March | <1 | 0 | 20 | 4 | 4 |
| April | 5 | <1 | 11 | 4 | <1 |
| May | 10 | <1 | 3 | 5 | 0 |
| June | 20 | 5 | 0 | 4 | 0 |
| July | 23 | 7 | 0 | 5 | 0 |
| August | 25 | 7 | 0 | 3 | 0 |
| September | 14 | 2 | <1 | 3 | 0 |
| October | 4 | <1 | 9 | 3 | <1 |
| November | <1 | 0 | 17 | 3 | 2 |
| December | 0 | 0 | 25 | 3 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 46% | 10% | 69% | -0.1–7.4°C |
| February | 1% | 43% | 10% | 64% | 1.7–8.7°C |
| March | 9% | 42% | 13% | 64% | 7.4–13.4°C |
| April | 25% | 40% | 12% | 55% | 14.1–19.6°C |
| May | 43% | 39% | 14% | 54% | 19.5–24.8°C |
| June | 60% | 37% | 15% | 49% | 24.4–27.4°C |
| July | 64% | 37% | 16% | 48% | 26.2–29.0°C |
| August | 69% | 30% | 12% | 34% | 25.4–28.8°C |
| September | 58% | 29% | 12% | 35% | 22.1–26.1°C |
| October | 32% | 28% | 9% | 34% | 15.7–19.9°C |
| November | 10% | 34% | 10% | 45% | 9.2–15.5°C |
| December | 2% | 41% | 10% | 61% | 1.4–9.7°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