May
May · September · August
United States · 1991–2020
May leads for comfortable weather in Mariano: typically 23.8°C by day, 2.9°C at night, with 19 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · August
August · July · June
October · May · April
The weakest month is January, scoring 5 against May’s 77 — days reach only 5.5°C, 18° below the 24°C the score treats as ideal, and nights drop to -9.8°C.
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 | 5.5°C | -9.8°C | 25 mm | 4.4 | 9 h 52 | 5 | Good coverage |
| February | 8.2°C | -7.4°C | 24 mm | 4.9 | 10 h 46 | 6 | Good coverage |
| March | 14°C | -4.4°C | 17 mm | 4.1 | 11 h 51 | 31 | Good coverage |
| April | 18.1°C | -1.3°C | 18 mm | 3.7 | 13 h 06 | 50 | Good coverage |
| May | 23.8°C | 2.9°C | 19 mm | 3.3 | 14 h 08 | 77 | Good coverage |
| June | 30.6°C | 7.2°C | 8 mm | 1.6 | 14 h 42 | 64 | Good coverage |
| July | 32.8°C | 12.6°C | 28 mm | 5.4 | 14 h 29 | 64 | Good coverage |
| August | 30.9°C | 11.4°C | 33 mm | 5.2 | 13 h 35 | 69 | Good coverage |
| September | 26.6°C | 6.4°C | 37 mm | 4.6 | 12 h 22 | 74 | Good coverage |
| October | 19.3°C | -0.1°C | 27 mm | 4.1 | 11 h 10 | 56 | Good coverage |
| November | 12.1°C | -5.6°C | 19 mm | 3.7 | 10 h 07 | 23 | Good coverage |
| December | 5.7°C | -9.6°C | 21 mm | 4.7 | 9 h 37 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.7°C16 Jan 2000 | -28.3°C2 Jan 2011 | 24 mm17 Jan 2023 | 63 mm2008 · driest 0 mm in 2022 | 30 |
| February | 19.4°C10 Feb 2017 | -22.7°C2 Feb 2007 | 22 mm14 Feb 2019 | 52 mm2008 · driest 1 mm in 2002 | 30 |
| March | 29.4°C21 Mar 2026 | -18.3°C3 Mar 2002 | 20 mm15 Mar 2023 | 88 mm2023 · driest 1 mm in 2008 | 30 |
| April | 29.4°C24 Apr 2012 | -14.3°C5 Apr 2023 | 22 mm24 Apr 2005 | 48 mm2004 · driest 0 mm in 2021 | 30 |
| May | 36.1°C31 May 2002 | -7.8°C3 May 2011 | 23 mm10 May 2017 | 52 mm2019 · driest 0 mm in 2022 | 30 |
| June | 38.9°C16 Jun 2021 | -2.8°C5 Jun 1999 | 25 mm17 Jun 2018 | 41 mm2015 · driest 0 mm in 2017 | 30 |
| July | 39.4°C9 Jul 2021 | 0.6°C2 Jul 1997 | 25 mm25 Jul 2005 | 62 mm2006 · driest 2 mm in 2023 | 31 |
| August | 37.2°C24 Aug 2011 | 2.8°C25 Aug 2002 | 46 mm25 Aug 2013 | 98 mm2013 · driest 2 mm in 2020 | 30 |
| September | 36.7°C5 Sep 2022 | -5.0°C29 Sep 1999 | 67 mm9 Sep 2003 | 85 mm2004 · driest 4 mm in 2009 | 30 |
| October | 30.6°C1 Oct 2015 | -16.6°C31 Oct 2019 | 26 mm4 Oct 2011 | 97 mm1998 · driest 0 mm in 1999 | 30 |
| November | 23.3°C10 Nov 2005 | -18.8°C25 Nov 2010 | 28 mm8 Nov 1998 | 51 mm1998 · driest 1 mm in 1999 | 30 |
| December | 18.3°C23 Dec 2025 | -24.3°C31 Dec 2010 | 21 mm1 Dec 2007 | 59 mm2007 · driest 0 mm in 2017 | 30 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 |
| February | 0 | 0 | 27 | <1 |
| March | <1 | 0 | 28 | <1 |
| April | 2 | 0 | 20 | <1 |
| May | 15 | 3 | 7 | <1 |
| June | 27 | 20 | <1 | <1 |
| July | 31 | 27 | 0 | <1 |
| August | 30 | 21 | 0 | 1 |
| September | 22 | 6 | 2 | 1 |
| October | 4 | <1 | 17 | <1 |
| November | 0 | 0 | 28 | <1 |
| December | 0 | 0 | 30 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 14% | 2% | 12% | 2.7–8.4°C |
| February | 0% | 17% | 2% | 17% | 5.2–10.8°C |
| March | 13% | 14% | 1% | 15% | 11.7–16.8°C |
| April | 46% | 11% | 1% | 6% | 16.4–20.4°C |
| May | 78% | 10% | 1% | 8% | 21.5–26.3°C |
| June | 93% | 7% | 1% | 3% | 28.4–32.7°C |
| July | 83% | 17% | 2% | 17% | 31.8–34.2°C |
| August | 83% | 17% | 3% | 13% | 29.2–32.4°C |
| September | 82% | 15% | 4% | 9% | 24.4–28.4°C |
| October | 49% | 14% | 3% | 13% | 17.2–21.8°C |
| November | 6% | 12% | 1% | 8% | 9.8–14.8°C |
| December | 0% | 15% | 1% | 12% | 4.3–8.2°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