September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Benson: typically 25.4°C by day, 5.6°C at night, with 34 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
August · July · June
May · September · June
The weakest month is January, scoring 5 against September’s 77 — days reach only -0.5°C, 24° 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 | -0.5°C | -10.4°C | 32 mm | 6.4 | 9 h 27 | 5 | Good coverage |
| February | 2.4°C | -8.5°C | 32 mm | 6.8 | 10 h 31 | 5 | Good coverage |
| March | 9.8°C | -2.7°C | 40 mm | 7.2 | 11 h 48 | 17 | Good coverage |
| April | 15.1°C | 0.8°C | 51 mm | 8.6 | 13 h 17 | 38 | Good coverage |
| May | 20.5°C | 4.3°C | 50 mm | 7.4 | 14 h 31 | 63 | Good coverage |
| June | 27.2°C | 7.9°C | 25 mm | 4.1 | 15 h 12 | 76 | Good coverage |
| July | 33.1°C | 12.1°C | 8 mm | 1.9 | 14 h 56 | 65 | Good coverage |
| August | 31.5°C | 10.7°C | 18 mm | 3.1 | 13 h 51 | 68 | Good coverage |
| September | 25.4°C | 5.6°C | 34 mm | 4.2 | 12 h 26 | 77 | Good coverage |
| October | 16.9°C | 0.1°C | 33 mm | 5.8 | 11 h 00 | 47 | Good coverage |
| November | 8.5°C | -4.4°C | 29 mm | 5.5 | 9 h 46 | 12 | Good coverage |
| December | 0.5°C | -9.2°C | 28 mm | 6 | 9 h 09 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.0°C31 Jan 2003 | -35.0°C30 Jan 2002 | 25 mm11 Jan 2005 | 98 mm2005 · driest 3 mm in 2018 | 28 |
| February | 17.8°C7 Feb 2015 | -28.9°C6 Feb 2002 | 24 mm10 Feb 2017 | 98 mm2017 · driest 1 mm in 2022 | 28 |
| March | 26.1°C20 Mar 2026 | -23.8°C3 Mar 2007 | 33 mm2 Mar 2026 | 81 mm2016 · driest 9 mm in 2013 | 28 |
| April | 29.4°C23 Apr 2012 | -12.7°C6 Apr 2023 | 31 mm28 Apr 2005 | 115 mm2005 · driest 13 mm in 2020 | 28 |
| May | 36.1°C30 May 2020 | -6.1°C8 May 2002 | 39 mm28 May 2004 | 133 mm2015 · driest 12 mm in 2001 | 28 |
| June | 38.3°C15 Jun 2021 | -2.2°C10 Jun 2002 | 27 mm7 Jun 2005 | 92 mm2009 · driest 0 mm in 2021 | 28 |
| July | 40.6°C12 Jul 2026 | 4.4°C29 Jul 2015 | 13 mm27 Jul 2007 | 26 mm2014 · driest 0 mm in 2016 | 28 |
| August | 40.0°C2 Aug 2020 | 2.2°C31 Aug 2010 | 47 mm6 Aug 2022 | 65 mm2022 · driest 0 mm in 2013 | 27 |
| September | 37.2°C6 Sep 2022 | -5.6°C27 Sep 1999 | 42 mm28 Sep 2019 | 99 mm2019 · driest 0 mm in 2018 | 27 |
| October | 31.1°C2 Oct 2010 | -16.6°C30 Oct 2019 | 35 mm20 Oct 2004 | 113 mm2004 · driest 1 mm in 2017 | 28 |
| November | 23.9°C6 Nov 2020 | -26.0°C25 Nov 2010 | 18 mm17 Nov 2017 | 60 mm2017 · driest 4 mm in 2009 | 28 |
| December | 16.1°C3 Dec 1998 | -28.3°C26 Dec 2001 | 24 mm16 Dec 2016 | 64 mm2010 · driest 1 mm in 2011 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 |
| February | 0 | 0 | 26 | <1 |
| March | 0 | 0 | 23 | 1 |
| April | 1 | 0 | 14 | 1 |
| May | 8 | 2 | 4 | 2 |
| June | 21 | 11 | <1 | <1 |
| July | 30 | 26 | 0 | <1 |
| August | 29 | 24 | 0 | <1 |
| September | 19 | 6 | 2 | 1 |
| October | 3 | <1 | 17 | <1 |
| November | 0 | 0 | 26 | <1 |
| December | 0 | 0 | 30 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 21% | 2% | 23% | -4.4–3.9°C |
| February | 0% | 24% | 2% | 25% | -2.2–6.5°C |
| March | 6% | 23% | 3% | 23% | 6.1–13.5°C |
| April | 20% | 26% | 4% | 29% | 13.0–17.1°C |
| May | 53% | 23% | 5% | 24% | 18.1–22.8°C |
| June | 83% | 13% | 2% | 11% | 24.7–29.9°C |
| July | 95% | 5% | <1% | 4% | 31.5–35.0°C |
| August | 89% | 11% | 2% | 6% | 29.7–32.9°C |
| September | 81% | 13% | 4% | 13% | 23.7–28.0°C |
| October | 32% | 19% | 4% | 19% | 14.3–19.9°C |
| November | 2% | 18% | 2% | 17% | 5.8–11.4°C |
| December | 0% | 20% | 2% | 21% | -2.2–3.9°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