September
September · July · August
76climate match
United States · 1991–2020
Best time to visit
Anceney.
September leads for comfortable weather in Anceney: typically 22.8°C by day, 5.5°C at night, with 33 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high22.8°C
Typical low5.5°C
Rain in September33 mm
July
July · August · September
66climate match
September
September · June · May
80climate match
The weakest month is January, scoring 5 against September’s 76 — days reach only 1.7°C, 22° 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
51.7° / -9.5°
Feb
53.1° / -8.5°
Mar
128.6° / -4.4°
Apr
3013.4° / -0.9°
May
5118.4° / 3.8°
Jun
7022.7° / 7°
Jul
7428.6° / 10.3°
Aug
7328.4° / 9.4°
Sep
7622.8° / 5.5°
Oct
3914.6° / 0.1°
Nov
56.2° / -5.6°
Dec
51.2° / -10°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 1.7°C | -9.5°C | 14 mm | 3.5 | 9 h 03 | 5 | Strong coverage |
| February | 3.1°C | -8.5°C | 14 mm | 3.6 | 10 h 18 | 5 | Strong coverage |
| March | 8.6°C | -4.4°C | 24 mm | 5.8 | 11 h 46 | 12 | Strong coverage |
| April | 13.4°C | -0.9°C | 48 mm | 8.2 | 13 h 27 | 30 | Strong coverage |
| May | 18.4°C | 3.8°C | 65 mm | 10.1 | 14 h 53 | 51 | Strong coverage |
| June | 22.7°C | 7°C | 73 mm | 10.1 | 15 h 41 | 70 | Strong coverage |
| July | 28.6°C | 10.3°C | 30 mm | 5.6 | 15 h 22 | 74 | Strong coverage |
| August | 28.4°C | 9.4°C | 30 mm | 5.2 | 14 h 07 | 73 | Strong coverage |
| September | 22.8°C | 5.5°C | 33 mm | 5.9 | 12 h 29 | 76 | Strong coverage |
| October | 14.6°C | 0.1°C | 36 mm | 6.1 | 10 h 51 | 39 | Strong coverage |
| November | 6.2°C | -5.6°C | 22 mm | 4.3 | 9 h 25 | 5 | Strong coverage |
| December | 1.2°C | -10°C | 17 mm | 4.3 | 8 h 42 | 5 | Strong coverage |
What has changed
Anceney runs +0.6°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
+0.9
Feb
-2.3
Mar
+1.1
Apr
+0.2
May
-0.2
Jun
+0.6
Jul
+1.4
Aug
+1.4
Sep
+2.1
Oct
+0.3
Nov
+0.6
Dec
+1.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C16 Jan 1974 | -38.9°C13 Jan 2024 | 15 mm19 Jan 2018 | 32 mm1995 · driest 1 mm in 2026 | 60 |
| February | 17.8°C24 Feb 1995 | -37.2°C5 Feb 1989 | 15 mm24 Feb 1996 | 40 mm1980 · driest 0 mm in 1977 | 60 |
| March | 25.0°C20 Mar 2026 | -32.2°C4 Mar 2019 | 25 mm29 Mar 1967 | 61 mm1967 · driest 5 mm in 2015 | 60 |
| April | 27.2°C29 Apr 1992 | -19.4°C8 Apr 1982 | 40 mm23 Apr 2018 | 84 mm2019 · driest 8 mm in 2013 | 59 |
| May | 32.2°C12 May 2001 | -8.9°C13 May 1983 | 55 mm7 May 1988 | 156 mm1981 · driest 16 mm in 2001 | 59 |
| June | 36.7°C30 Jun 1990 | -2.2°C8 Jun 1979 | 65 mm13 Jun 2001 | 179 mm1969 · driest 11 mm in 1974 | 60 |
| July | 38.3°C12 Jul 2026 | 0.0°C8 Jul 1981 | 53 mm3 Jul 1993 | 132 mm1993 · driest 2 mm in 1996 | 60 |
| August | 37.8°C13 Aug 2003 | -3.3°C25 Aug 1992 | 42 mm7 Aug 1995 | 109 mm1995 · driest 0 mm in 2001 | 59 |
| September | 36.1°C5 Sep 2020 | -10.6°C29 Sep 1985 | 40 mm21 Sep 1984 | 92 mm1978 · driest 1 mm in 1979 | 59 |
| October | 30.0°C1 Oct 2011 | -25.6°C26 Oct 2020 | 33 mm4 Oct 1992 | 90 mm1975 · driest 3 mm in 2002 | 59 |
| November | 23.9°C12 Nov 1999 | -30.6°C21 Nov 1977 | 28 mm12 Nov 2009 | 53 mm1983 · driest 2 mm in 2023 | 60 |
| December | 20.0°C15 Dec 2025 | -40.6°C22 Dec 2022 | 15 mm25 Dec 1996 | 43 mm2017 · driest 2 mm in 1976 | 60 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | <1 | 2 |
| February | 0 | 0 | 25 | <1 | 1 |
| March | 0 | 0 | 26 | <1 | 1 |
| April | <1 | 0 | 19 | 1 | 1 |
| May | 4 | <1 | 6 | 2 | <1 |
| June | 11 | 3 | <1 | 2 | 0 |
| July | 26 | 14 | 0 | <1 | 0 |
| August | 25 | 13 | <1 | <1 | 0 |
| September | 12 | 3 | 3 | 1 | 0 |
| October | 2 | 0 | 15 | <1 | <1 |
| November | 0 | 0 | 25 | <1 | 2 |
| December | 0 | 0 | 29 | <1 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 13% | <1% | 6% | -2.1–4.8°C |
| February | 0% | 14% | <1% | 9% | -1.1–7.0°C |
| March | 2% | 20% | 1% | 17% | 4.5–11.9°C |
| April | 14% | 27% | 4% | 27% | 9.9–15.9°C |
| May | 35% | 32% | 7% | 42% | 15.5–20.8°C |
| June | 57% | 33% | 7% | 42% | 20.6–25.4°C |
| July | 80% | 19% | 3% | 16% | 26.1–30.8°C |
| August | 80% | 19% | 3% | 16% | 25.0–30.4°C |
| September | 62% | 20% | 4% | 22% | 19.3–25.3°C |
| October | 23% | 20% | 4% | 16% | 12.3–17.8°C |
| November | 1% | 16% | 2% | 9% | 2.9–9.0°C |
| December | <1% | 14% | <1% | 7% | -2.6–4.2°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 5637176
- NOAA station
- USC00241047 · BOZEMAN 6 W EXP FARM
- Station distance
- 15.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 45.65°, 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.