September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Elberfeld: typically 27.6°C by day, 14.6°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · July · June
October · April · September
The weakest month is January, scoring 5 against September’s 78 — days reach only 5.3°C, 19° below the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 5.3°C | -3.7°C | 84 mm | 8 | 9 h 47 | 5 | Strong coverage |
| February | 8.1°C | -2.1°C | 82 mm | 7.5 | 10 h 43 | 6 | Strong coverage |
| March | 13.6°C | 2.3°C | 117 mm | 9.2 | 11 h 50 | 26 | Strong coverage |
| April | 20.1°C | 7.7°C | 131 mm | 9.5 | 13 h 08 | 55 | Strong coverage |
| May | 25.1°C | 13.5°C | 130 mm | 10.2 | 14 h 13 | 74 | Strong coverage |
| June | 29.7°C | 18.3°C | 112 mm | 8.6 | 14 h 48 | 59 | Strong coverage |
| July | 31.3°C | 20.3°C | 111 mm | 8 | 14 h 34 | 51 | Strong coverage |
| August | 30.9°C | 19.1°C | 78 mm | 5.6 | 13 h 38 | 61 | Strong coverage |
| September | 27.6°C | 14.6°C | 84 mm | 6.1 | 12 h 23 | 78 | Strong coverage |
| October | 21.1°C | 8.3°C | 86 mm | 6.8 | 11 h 08 | 68 | Strong coverage |
| November | 13.3°C | 2.4°C | 104 mm | 7.7 | 10 h 03 | 28 | Strong coverage |
| December | 7.5°C | -1.5°C | 97 mm | 8 | 9 h 31 | 5 | Strong coverage |
What has changed
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.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.3°C25 Jan 1950 | -29.4°C17 Jan 1977 | 95 mm22 Jan 1982 | 343 mm1950 · driest 13 mm in 1981 | 79 |
| February | 26.1°C13 Feb 1962 | -30.6°C2 Feb 1951 | 88 mm24 Feb 2018 | 235 mm2018 · driest 15 mm in 2004 | 79 |
| March | 31.1°C22 Mar 2026 | -22.8°C6 Mar 1960 | 163 mm18 Mar 2008 | 326 mm1964 · driest 34 mm in 1966 | 79 |
| April | 32.8°C26 Apr 1989 | -5.0°C7 Apr 1990 | 153 mm28 Apr 1996 | 301 mm1996 · driest 28 mm in 1959 | 79 |
| May | 35.0°C17 May 1962 | -2.2°C1 May 1963 | 125 mm17 May 1995 | 343 mm1995 · driest 23 mm in 1965 | 79 |
| June | 41.7°C28 Jun 2012 | 5.0°C1 Jun 1966 | 104 mm24 Jun 2013 | 263 mm2026 · driest 4 mm in 2012 | 79 |
| July | 41.7°C5 Jul 2012 | 9.4°C27 Jul 1962 | 104 mm1 Jul 1978 | 246 mm1958 · driest 5 mm in 1974 | 79 |
| August | 40.0°C15 Aug 2007 | 6.1°C29 Aug 1986 | 90 mm23 Aug 1977 | 216 mm2005 · driest 6 mm in 1976 | 78 |
| September | 39.4°C5 Sep 1954 | 0.6°C30 Sep 1949 | 114 mm3 Sep 2022 | 223 mm2006 · driest 2 mm in 2019 | 78 |
| October | 35.6°C2 Oct 2019 | -6.1°C22 Oct 1952 | 93 mm29 Oct 2020 | 209 mm2009 · driest 0 mm in 1964 | 78 |
| November | 30.0°C1 Nov 2016 | -19.4°C25 Nov 1950 | 88 mm4 Nov 1988 | 216 mm1957 · driest 13 mm in 1999 | 78 |
| December | 25.0°C2 Dec 1982 | -26.1°C22 Dec 1989 | 112 mm21 Dec 2013 | 209 mm1982 · driest 14 mm in 1976 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 24 | 3 | 3 |
| February | <1 | 0 | 19 | 3 | 2 |
| March | 2 | 0 | 12 | 4 | <1 |
| April | 7 | <1 | 2 | 4 | <1 |
| May | 17 | 6 | 0 | 4 | 0 |
| June | 28 | 17 | 0 | 3 | 0 |
| July | 30 | 22 | 0 | 4 | 0 |
| August | 30 | 20 | 0 | 2 | 0 |
| September | 22 | 10 | 0 | 3 | 0 |
| October | 9 | 2 | 2 | 3 | <1 |
| November | <1 | 0 | 12 | 3 | <1 |
| December | 0 | 0 | 20 | 3 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 83); on 2011–2025 it is May (81). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 25% | 9% | 27% | 1.7–8.4°C |
| February | 3% | 26% | 10% | 29% | 3.6–10.8°C |
| March | 14% | 30% | 12% | 35% | 9.4–16.9°C |
| April | 36% | 31% | 12% | 39% | 17.3–22.4°C |
| May | 60% | 31% | 13% | 39% | 22.7–27.5°C |
| June | 72% | 27% | 10% | 31% | 28.4–31.9°C |
| July | 74% | 26% | 11% | 26% | 29.6–33.4°C |
| August | 81% | 19% | 8% | 17% | 29.1–32.4°C |
| September | 77% | 20% | 8% | 17% | 24.9–29.8°C |
| October | 49% | 20% | 8% | 20% | 18.7–23.5°C |
| November | 13% | 25% | 10% | 27% | 10.0–15.9°C |
| December | 2% | 26% | 10% | 31% | 3.8–10.3°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