September
September · August · May
83climate match
United States · 1991–2020
Best time to visit
Garnavillo.
September leads for comfortable weather in Garnavillo: typically 23.7°C by day, 12.7°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.7°C
Typical low12.7°C
Rain in September95 mm
July
July · August · June
71climate match
May
May · October · September
72climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only -2.3°C, 26° 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
5-2.3° / -11.4°
Feb
50.4° / -9.4°
Mar
87.3° / -2.3°
Apr
3815.1° / 4.4°
May
6721.6° / 10.6°
Jun
6726.8° / 16.3°
Jul
6128.8° / 18.5°
Aug
7227.6° / 17.2°
Sep
8323.7° / 12.7°
Oct
5016.3° / 5.9°
Nov
127.7° / -1°
Dec
50.5° / -7.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.3°C | -11.4°C | 33 mm | 5.9 | 9 h 21 | 5 | Strong coverage |
| February | 0.4°C | -9.4°C | 31 mm | 5.5 | 10 h 28 | 5 | Strong coverage |
| March | 7.3°C | -2.3°C | 50 mm | 7 | 11 h 47 | 8 | Strong coverage |
| April | 15.1°C | 4.4°C | 93 mm | 8.9 | 13 h 19 | 38 | Strong coverage |
| May | 21.6°C | 10.6°C | 115 mm | 10.2 | 14 h 37 | 67 | Strong coverage |
| June | 26.8°C | 16.3°C | 145 mm | 9.5 | 15 h 19 | 67 | Strong coverage |
| July | 28.8°C | 18.5°C | 123 mm | 8 | 15 h 03 | 61 | Strong coverage |
| August | 27.6°C | 17.2°C | 92 mm | 7.3 | 13 h 56 | 72 | Strong coverage |
| September | 23.7°C | 12.7°C | 95 mm | 7.3 | 12 h 26 | 83 | Strong coverage |
| October | 16.3°C | 5.9°C | 72 mm | 6.3 | 10 h 58 | 50 | Strong coverage |
| November | 7.7°C | -1°C | 54 mm | 5.8 | 9 h 40 | 12 | Strong coverage |
| December | 0.5°C | -7.3°C | 42 mm | 6.5 | 9 h 02 | 5 | Strong coverage |
What has changed
Garnavillo runs +0.2°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
+0.7
Feb
-0.3
Mar
+0.8
Apr
-1.1
May
-0.3
Jun
+0.3
Jul
-0.4
Aug
-0.3
Sep
+1.0
Oct
-0.1
Nov
+0.7
Dec
+1.8
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.6°C31 Jan 2025 | -37.8°C30 Jan 1951 | 51 mm9 Jan 2026 | 79 mm1979 · driest 2 mm in 2025 | 80 |
| February | 22.8°C27 Feb 2024 | -38.9°C3 Feb 1996 | 31 mm5 Feb 1986 | 91 mm1971 · driest 0 mm in 1987 | 81 |
| March | 30.6°C29 Mar 1986 | -34.4°C1 Mar 1962 | 74 mm31 Mar 1998 | 135 mm1998 · driest 6 mm in 1994 | 80 |
| April | 36.1°C22 Apr 1980 | -13.9°C6 Apr 1982 | 80 mm25 Apr 2008 | 224 mm2008 · driest 24 mm in 2016 | 82 |
| May | 35.0°C14 May 2013 | -2.8°C3 May 2005 | 97 mm29 May 2020 | 284 mm2004 · driest 13 mm in 1981 | 80 |
| June | 38.3°C21 Jun 1988 | 3.9°C13 Jun 2019 | 114 mm15 Jun 1991 | 262 mm2013 · driest 12 mm in 1988 | 79 |
| July | 39.4°C25 Jul 2012 | 7.8°C30 Jul 1971 | 158 mm22 Jul 2017 | 353 mm2017 · driest 16 mm in 1941 | 81 |
| August | 39.4°C24 Aug 2023 | 4.4°C28 Aug 1986 | 83 mm15 Aug 1940 | 261 mm1940 · driest 4 mm in 1969 | 80 |
| September | 38.3°C7 Sep 1939 | -2.8°C30 Sep 1972 | 113 mm20 Sep 2018 | 347 mm2019 · driest 5 mm in 1979 | 80 |
| October | 34.4°C3 Oct 1997 | -10.0°C19 Oct 1972 | 89 mm23 Oct 2020 | 289 mm2018 · driest 0 mm in 1952 | 79 |
| November | 25.6°C1 Nov 1950 | -23.9°C26 Nov 1977 | 95 mm4 Nov 2003 | 152 mm2003 · driest 3 mm in 1976 | 80 |
| December | 20.6°C16 Dec 2021 | -33.9°C25 Dec 2000 | 51 mm14 Dec 2015 | 121 mm2015 · driest 4 mm in 1998 | 80 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 6 |
| February | 0 | 0 | 26 | 1 | 4 |
| March | <1 | 0 | 21 | 1 | 2 |
| April | 2 | <1 | 6 | 3 | <1 |
| May | 10 | 2 | <1 | 4 | 0 |
| June | 21 | 7 | 0 | 4 | 0 |
| July | 27 | 13 | 0 | 4 | 0 |
| August | 25 | 8 | 0 | 3 | 0 |
| September | 13 | 4 | 0 | 3 | 0 |
| October | 3 | <1 | 4 | 2 | <1 |
| November | <1 | 0 | 18 | 2 | 1 |
| December | 0 | 0 | 28 | 1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 17% | 2% | 13% | -6.1–0.6°C |
| February | <1% | 17% | 3% | 13% | -2.9–4.7°C |
| March | 4% | 22% | 5% | 24% | 3.5–10.6°C |
| April | 20% | 29% | 9% | 35% | 12.1–18.2°C |
| May | 48% | 31% | 12% | 39% | 19.7–24.5°C |
| June | 67% | 31% | 13% | 37% | 25.2–28.7°C |
| July | 74% | 26% | 11% | 26% | 27.2–30.8°C |
| August | 75% | 24% | 10% | 24% | 26.1–29.6°C |
| September | 63% | 24% | 9% | 25% | 21.8–26.1°C |
| October | 29% | 20% | 7% | 18% | 14.3–19.8°C |
| November | 3% | 19% | 5% | 16% | 3.6–10.7°C |
| December | 0% | 19% | 4% | 15% | -3.1–3.8°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 4858103
- NOAA station
- USC00133517 · GUTTENBERG L&D 10
- Station distance
- 14.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 42.87°, 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.