September
September · August · June
79climate match
United States · 1991–2020
Best time to visit
Morrison.
September leads for comfortable weather in Morrison: typically 24.7°C by day, 10.6°C at night, with 92 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.7°C
Typical low10.6°C
Rain in September92 mm
July
July · August · June
71climate match
October
October · September · May
73climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only -0.8°C, 25° below the 24°C the score treats as ideal.
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
5-0.8° / -11.1°
Feb
51.7° / -9°
Mar
98.8° / -2.9°
Apr
3616° / 2.7°
May
6722.4° / 9.4°
Jun
7027.4° / 14.7°
Jul
6729.2° / 16.6°
Aug
7228.1° / 15.4°
Sep
7924.7° / 10.6°
Oct
5117.6° / 4.1°
Nov
149.3° / -2°
Dec
52.3° / -7.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -0.8°C | -11.1°C | 39 mm | 6.1 | 9 h 27 | 5 | Strong coverage |
| February | 1.7°C | -9°C | 42 mm | 5.4 | 10 h 31 | 5 | Strong coverage |
| March | 8.8°C | -2.9°C | 70 mm | 7.2 | 11 h 48 | 9 | Strong coverage |
| April | 16°C | 2.7°C | 101 mm | 9.4 | 13 h 17 | 36 | Strong coverage |
| May | 22.4°C | 9.4°C | 117 mm | 9.9 | 14 h 31 | 67 | Strong coverage |
| June | 27.4°C | 14.7°C | 130 mm | 8.9 | 15 h 12 | 70 | Strong coverage |
| July | 29.2°C | 16.6°C | 105 mm | 6.6 | 14 h 56 | 67 | Strong coverage |
| August | 28.1°C | 15.4°C | 107 mm | 7.2 | 13 h 51 | 72 | Strong coverage |
| September | 24.7°C | 10.6°C | 92 mm | 6.3 | 12 h 26 | 79 | Strong coverage |
| October | 17.6°C | 4.1°C | 70 mm | 6.3 | 11 h 00 | 51 | Strong coverage |
| November | 9.3°C | -2°C | 63 mm | 6 | 9 h 46 | 14 | Strong coverage |
| December | 2.3°C | -7.6°C | 58 mm | 7.1 | 9 h 09 | 5 | Strong coverage |
What has changed
Morrison runs -0.3°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
+0.3
Feb
-0.4
Mar
+0.5
Apr
-1.3
May
-0.7
Jun
-0.8
Jul
-1.2
Aug
-0.8
Sep
+0.5
Oct
-0.4
Nov
-0.4
Dec
+1.7
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.3°C2 Jan 1897 | -37.2°C31 Jan 2019 | 57 mm12 Jan 1960 | 126 mm1916 · driest 3 mm in 1981 | 130 |
| February | 25.0°C28 Feb 2024 | -37.2°C1 Feb 2019 | 45 mm27 Feb 1948 | 112 mm1981 · driest 1 mm in 2026 | 130 |
| March | 30.0°C30 Mar 1986 | -27.2°C3 Mar 2014 | 63 mm5 Mar 1976 | 163 mm2009 · driest 0 mm in 1935 | 130 |
| April | 37.2°C29 Apr 1926 | -13.3°C7 Apr 1982 | 104 mm18 Apr 2013 | 227 mm1973 · driest 11 mm in 1915 | 129 |
| May | 40.6°C31 May 1934 | -5.0°C3 May 2005 | 107 mm17 May 1974 | 325 mm1974 · driest 12 mm in 2007 | 130 |
| June | 41.1°C28 Jun 1934 | 1.7°C11 Jun 1972 | 154 mm4 Jun 2002 | 296 mm2000 · driest 10 mm in 1910 | 129 |
| July | 44.4°C14 Jul 1936 | 5.0°C2 Jul 1904 | 103 mm8 Jul 1951 | 286 mm1992 · driest 3 mm in 1991 | 131 |
| August | 40.6°C18 Aug 1988 | 2.2°C31 Aug 1915 | 117 mm18 Aug 1979 | 338 mm1987 · driest 7 mm in 1901 | 131 |
| September | 39.4°C5 Sep 1899 | -7.2°C30 Sep 1899 | 100 mm8 Sep 1941 | 260 mm1970 · driest 1 mm in 1979 | 131 |
| October | 33.9°C6 Oct 1963 | -12.8°C29 Oct 1925 | 155 mm10 Oct 1954 | 219 mm1954 · driest 0 mm in 1952 | 130 |
| November | 26.7°C1 Nov 2000 | -21.7°C26 Nov 1977 | 68 mm17 Nov 1952 | 217 mm1985 · driest 1 mm in 1904 | 129 |
| December | 22.8°C16 Dec 2021 | -33.3°C26 Dec 1914 | 64 mm27 Dec 1942 | 132 mm2015 · driest 5 mm in 1976 | 129 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 5 |
| February | 0 | 0 | 26 | 1 | 3 |
| March | <1 | 0 | 23 | 2 | 2 |
| April | 3 | <1 | 8 | 3 | <1 |
| May | 12 | 3 | <1 | 4 | 0 |
| June | 23 | 10 | 0 | 4 | 0 |
| July | 28 | 14 | 0 | 3 | 0 |
| August | 26 | 10 | 0 | 4 | 0 |
| September | 16 | 5 | <1 | 3 | 0 |
| October | 4 | <1 | 7 | 2 | <1 |
| November | <1 | 0 | 20 | 2 | 1 |
| December | 0 | 0 | 28 | 2 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 20% | 4% | 15% | -4.6–2.7°C |
| February | <1% | 19% | 4% | 16% | -2.8–5.6°C |
| March | 5% | 24% | 7% | 28% | 4.4–12.0°C |
| April | 22% | 30% | 10% | 36% | 13.4–19.2°C |
| May | 50% | 32% | 12% | 40% | 19.8–25.6°C |
| June | 69% | 29% | 12% | 33% | 25.4–29.8°C |
| July | 75% | 24% | 10% | 26% | 27.7–32.2°C |
| August | 76% | 24% | 11% | 24% | 26.5–31.1°C |
| September | 66% | 24% | 10% | 23% | 23.0–27.4°C |
| October | 36% | 21% | 7% | 21% | 15.7–21.5°C |
| November | 5% | 20% | 7% | 17% | 6.0–12.5°C |
| December | <1% | 20% | 5% | 16% | -2.1–5.5°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
Nearby, measured,
and named.
- Place identity
- GeoNames 4902724
- NOAA station
- USC00115833 · MORRISON
- Station distance
- 1.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 41.81°, 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.