September
September · August · June
83climate match
United States · 1991–2020
Best time to visit
Rockwell City.
September leads for comfortable weather in Rockwell City: typically 24°C by day, 10.6°C at night, with 74 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24°C
Typical low10.6°C
Rain in September74 mm
July
July · August · June
72climate match
September
September · October · May
75climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only -3°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° / -13°
Feb
5-0.2° / -10.8°
Mar
67.4° / -4°
Apr
3515.3° / 2.1°
May
6021.3° / 9.2°
Jun
7226.7° / 15.2°
Jul
7028.4° / 17.1°
Aug
7327.1° / 15.9°
Sep
8324° / 10.6°
Oct
4916.7° / 3.6°
Nov
127.7° / -3.6°
Dec
50.1° / -9.5°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3°C | -13°C | 19 mm | 3.9 | 9 h 23 | 5 | Strong coverage |
| February | -0.2°C | -10.8°C | 23 mm | 4.5 | 10 h 29 | 5 | Strong coverage |
| March | 7.4°C | -4°C | 46 mm | 6.2 | 11 h 48 | 6 | Strong coverage |
| April | 15.3°C | 2.1°C | 92 mm | 8.1 | 13 h 18 | 35 | Strong coverage |
| May | 21.3°C | 9.2°C | 129 mm | 11.3 | 14 h 34 | 60 | Strong coverage |
| June | 26.7°C | 15.2°C | 127 mm | 9.8 | 15 h 16 | 72 | Strong coverage |
| July | 28.4°C | 17.1°C | 92 mm | 7.6 | 15 h | 70 | Strong coverage |
| August | 27.1°C | 15.9°C | 114 mm | 8 | 13 h 54 | 73 | Strong coverage |
| September | 24°C | 10.6°C | 74 mm | 6.6 | 12 h 26 | 83 | Strong coverage |
| October | 16.7°C | 3.6°C | 61 mm | 6.6 | 10 h 59 | 49 | Strong coverage |
| November | 7.7°C | -3.6°C | 34 mm | 4.3 | 9 h 43 | 12 | Strong coverage |
| December | 0.1°C | -9.5°C | 31 mm | 4.6 | 9 h 05 | 5 | Strong coverage |
What has changed
Rockwell City 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
+0.6
Feb
-1.5
Mar
+1.0
Apr
-1.3
May
-1.6
Jun
-0.8
Jul
-1.4
Aug
-1.2
Sep
+0.7
Oct
-0.3
Nov
+1.0
Dec
+1.9
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C27 Jan 2002 | -37.2°C30 Jan 2019 | 33 mm5 Jan 1932 | 71 mm1932 · driest 0 mm in 1948 | 127 |
| February | 21.1°C23 Feb 2017 | -36.1°C16 Feb 2021 | 40 mm13 Feb 1915 | 137 mm1915 · driest 1 mm in 1933 | 123 |
| March | 32.8°C22 Mar 2026 | -30.0°C1 Mar 1962 | 52 mm13 Mar 1990 | 144 mm1991 · driest 0 mm in 1910 | 125 |
| April | 36.1°C22 Apr 1980 | -15.6°C3 Apr 1936 | 81 mm21 Apr 1954 | 221 mm1999 · driest 6 mm in 1926 | 124 |
| May | 41.1°C30 May 1934 | -8.3°C3 May 1907 | 149 mm5 May 1982 | 290 mm2001 · driest 12 mm in 1948 | 127 |
| June | 40.6°C10 Jun 1933 | 1.1°C3 Jun 1945 | 127 mm21 Jun 1954 | 297 mm1967 · driest 10 mm in 1933 | 125 |
| July | 42.8°C4 Jul 1936 | 5.6°C12 Jul 1897 | 154 mm23 Jul 1979 | 250 mm1902 · driest 13 mm in 1930 | 126 |
| August | 43.3°C18 Aug 1936 | 2.2°C30 Aug 1915 | 134 mm20 Aug 2007 | 484 mm2007 · driest 0 mm in 1947 | 127 |
| September | 38.9°C7 Sep 1939 | -6.7°C29 Sep 1899 | 133 mm10 Sep 1911 | 360 mm1965 · driest 8 mm in 1953 | 126 |
| October | 34.4°C5 Oct 1963 | -19.4°C29 Oct 1925 | 64 mm11 Oct 1986 | 158 mm2009 · driest 0 mm in 2010 | 128 |
| November | 26.7°C9 Nov 1999 | -26.7°C28 Nov 1897 | 89 mm13 Nov 1909 | 226 mm1909 · driest 0 mm in 1924 | 128 |
| December | 21.1°C16 Dec 2021 | -35.6°C29 Dec 1917 | 62 mm14 Dec 2015 | 137 mm2015 · driest 0 mm in 1994 | 128 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 4 |
| February | 0 | 0 | 27 | <1 | 3 |
| March | <1 | 0 | 23 | 1 | 2 |
| April | 3 | <1 | 10 | 3 | <1 |
| May | 9 | 2 | <1 | 4 | 0 |
| June | 21 | 7 | 0 | 4 | 0 |
| July | 26 | 10 | 0 | 3 | 0 |
| August | 22 | 7 | 0 | 3 | 0 |
| September | 14 | 4 | <1 | 2 | 0 |
| October | 4 | <1 | 8 | 2 | <1 |
| November | <1 | 0 | 22 | 1 | 1 |
| December | 0 | 0 | 29 | <1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 12% | 2% | 6% | -6.6–2.3°C |
| February | <1% | 14% | 3% | 10% | -4.1–3.9°C |
| March | 6% | 19% | 5% | 18% | 2.6–11.7°C |
| April | 24% | 25% | 9% | 28% | 12.4–18.4°C |
| May | 49% | 31% | 12% | 39% | 19.7–25.1°C |
| June | 68% | 29% | 13% | 34% | 24.9–29.5°C |
| July | 76% | 23% | 10% | 23% | 27.3–32.1°C |
| August | 76% | 23% | 10% | 22% | 26.3–30.7°C |
| September | 65% | 22% | 10% | 23% | 22.2–26.6°C |
| October | 36% | 18% | 7% | 16% | 14.8–20.6°C |
| November | 4% | 14% | 5% | 10% | 4.6–11.8°C |
| December | 0% | 13% | 3% | 8% | -3.9–4.1°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 4873426
- NOAA station
- USC00137161 · ROCKWELL CITY
- Station distance
- 0.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.40°, 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.