September
September · August · June
82climate match
United States · 1991–2020
Best time to visit
Barnum.
September leads for comfortable weather in Barnum: typically 23.4°C by day, 10.5°C at night, with 70 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.4°C
Typical low10.5°C
Rain in September70 mm
July
July · August · June
70climate match
September
September · May · October
78climate match
The weakest month is January, scoring 5 against September’s 82 — days reach only -3.5°C, 27° 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
5-3.5° / -13.3°
Feb
5-0.9° / -11.2°
Mar
56.5° / -4.3°
Apr
3314.9° / 1.9°
May
5821° / 8.9°
Jun
7026.5° / 15°
Jul
6828.3° / 17°
Aug
7226.9° / 15.6°
Sep
8223.4° / 10.5°
Oct
4716.3° / 3.4°
Nov
97.3° / -3.6°
Dec
5-0.4° / -9.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3.5°C | -13.3°C | 28 mm | 4.5 | 9 h 23 | 5 | Strong coverage |
| February | -0.9°C | -11.2°C | 31 mm | 5.2 | 10 h 29 | 5 | Strong coverage |
| March | 6.5°C | -4.3°C | 51 mm | 6.1 | 11 h 48 | 5 | Strong coverage |
| April | 14.9°C | 1.9°C | 98 mm | 8.2 | 13 h 18 | 33 | Strong coverage |
| May | 21°C | 8.9°C | 127 mm | 11.6 | 14 h 35 | 58 | Strong coverage |
| June | 26.5°C | 15°C | 141 mm | 10.6 | 15 h 17 | 70 | Strong coverage |
| July | 28.3°C | 17°C | 105 mm | 7.3 | 15 h 00 | 68 | Strong coverage |
| August | 26.9°C | 15.6°C | 130 mm | 8 | 13 h 54 | 72 | Strong coverage |
| September | 23.4°C | 10.5°C | 70 mm | 6.9 | 12 h 26 | 82 | Strong coverage |
| October | 16.3°C | 3.4°C | 61 mm | 6.1 | 10 h 59 | 47 | Strong coverage |
| November | 7.3°C | -3.6°C | 39 mm | 4.5 | 9 h 42 | 9 | Strong coverage |
| December | -0.4°C | -9.7°C | 34 mm | 4.9 | 9 h 05 | 5 | Strong coverage |
What has changed
Barnum 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
+0.1
Feb
-1.2
Mar
+0.5
Apr
-1.4
May
-1.5
Jun
-1.1
Jul
-1.9
Aug
-1.7
Sep
+0.1
Oct
-0.6
Nov
+0.2
Dec
+1.8
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C25 Jan 1944 | -37.2°C13 Jan 1912 | 70 mm31 Jan 2000 | 75 mm2000 · driest 0 mm in 2014 | 124 |
| February | 23.9°C27 Feb 2024 | -34.4°C2 Feb 1996 | 32 mm20 Feb 1954 | 83 mm1915 · driest 0 mm in 2014 | 125 |
| March | 32.2°C22 Mar 2026 | -30.0°C1 Mar 1962 | 66 mm23 Mar 1966 | 144 mm1979 · driest 0 mm in 2015 | 124 |
| April | 37.8°C22 Apr 1980 | -14.4°C3 Apr 1975 | 82 mm13 Apr 1964 | 216 mm1999 · driest 9 mm in 1910 | 125 |
| May | 41.1°C30 May 1934 | -6.1°C4 May 1907 | 83 mm19 May 1990 | 262 mm2001 · driest 16 mm in 1920 | 126 |
| June | 40.0°C27 Jun 1934 | 1.1°C21 Jun 1902 | 165 mm25 Jun 2005 | 306 mm1967 · driest 16 mm in 1933 | 125 |
| July | 43.3°C14 Jul 1936 | 5.6°C7 Jul 1934 | 113 mm6 Jul 2025 | 287 mm2010 · driest 5 mm in 1936 | 125 |
| August | 42.8°C18 Aug 1936 | 1.7°C30 Aug 1915 | 151 mm6 Aug 2018 | 385 mm2018 · driest 13 mm in 1984 | 125 |
| September | 39.4°C6 Sep 1939 | -6.7°C28 Sep 1942 | 160 mm19 Sep 1931 | 347 mm1965 · driest 7 mm in 1903 | 126 |
| October | 35.0°C4 Oct 1997 | -20.0°C30 Oct 1925 | 84 mm17 Oct 1968 | 195 mm2009 · driest 1 mm in 1952 | 124 |
| November | 30.6°C4 Nov 2005 | -22.8°C26 Nov 1977 | 59 mm23 Nov 1931 | 182 mm1909 · driest 0 mm in 2007 | 125 |
| December | 20.6°C16 Dec 2021 | -32.2°C24 Dec 1983 | 61 mm14 Dec 2015 | 130 mm2015 · driest 0 mm in 2013 | 125 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | <1 | 5 |
| February | 0 | 0 | 26 | <1 | 5 |
| March | <1 | 0 | 23 | 2 | 3 |
| April | 3 | <1 | 11 | 3 | 1 |
| May | 9 | 2 | <1 | 4 | <1 |
| June | 20 | 7 | 0 | 4 | 0 |
| July | 26 | 10 | 0 | 3 | 0 |
| August | 23 | 7 | 0 | 4 | 0 |
| September | 13 | 3 | <1 | 3 | 0 |
| October | 3 | <1 | 9 | 2 | <1 |
| November | <1 | 0 | 22 | 1 | 2 |
| December | 0 | 0 | 29 | <1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 15% | 2% | 10% | -7.2–2.0°C |
| February | 0% | 16% | 3% | 12% | -4.6–4.3°C |
| March | 6% | 20% | 5% | 16% | 2.1–11.2°C |
| April | 23% | 26% | 9% | 31% | 11.8–18.6°C |
| May | 48% | 32% | 12% | 41% | 19.5–25.0°C |
| June | 65% | 32% | 13% | 37% | 24.6–29.7°C |
| July | 74% | 25% | 10% | 27% | 27.2–32.2°C |
| August | 74% | 26% | 10% | 26% | 26.0–30.3°C |
| September | 63% | 24% | 10% | 24% | 21.7–26.5°C |
| October | 34% | 19% | 6% | 17% | 14.7–20.4°C |
| November | 4% | 16% | 5% | 12% | 4.0–11.1°C |
| December | 0% | 15% | 3% | 10% | -4.1–3.5°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 4847758
- NOAA station
- USC00132999 · FT DODGE 5NNW
- Station distance
- 15.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.51°, 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.