May
May · September · October
United States · 1991–2020
May leads for comfortable weather in Lake Powell: typically 27.3°C by day, 12.6°C at night, with 10 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · October
September · August · June
October · April · March
The weakest month is December, scoring 11 against May’s 85 — days reach only 6.5°C, 17° 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 | 7.2°C | -2.5°C | 17 mm | 2.7 | 9 h 53 | 13 | Good coverage |
| February | 10.5°C | -0.5°C | 13 mm | 3.5 | 10 h 46 | 27 | Good coverage |
| March | 16.3°C | 3.4°C | 13 mm | 2.8 | 11 h 51 | 54 | Good coverage |
| April | 21.2°C | 7.2°C | 11 mm | 2.2 | 13 h 05 | 77 | Good coverage |
| May | 27.3°C | 12.6°C | 10 mm | 1.9 | 14 h 07 | 85 | Good coverage |
| June | 33.1°C | 17.5°C | 3 mm | 0.9 | 14 h 41 | 66 | Good coverage |
| July | 35.9°C | 21.4°C | 14 mm | 2.6 | 14 h 28 | 49 | Good coverage |
| August | 34°C | 20.2°C | 22 mm | 4.2 | 13 h 34 | 57 | Good coverage |
| September | 29.3°C | 15.6°C | 21 mm | 3.4 | 12 h 22 | 81 | Good coverage |
| October | 21.5°C | 8.7°C | 27 mm | 3.1 | 11 h 11 | 80 | Good coverage |
| November | 12.5°C | 1.8°C | 11 mm | 1.8 | 10 h 09 | 38 | Good coverage |
| December | 6.5°C | -2.5°C | 10 mm | 2.5 | 9 h 38 | 11 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.8°C26 Jan 1999 | -23.9°C13 Jan 1963 | 26 mm22 Jan 2010 | 84 mm2010 · driest 0 mm in 1976 | 53 |
| February | 22.2°C26 Feb 1989 | -14.4°C6 Feb 1989 | 21 mm16 Feb 1970 | 50 mm2005 · driest 0 mm in 1972 | 54 |
| March | 27.8°C27 Mar 1971 | -7.8°C1 Mar 1962 | 31 mm2 Mar 1970 | 56 mm1983 · driest 0 mm in 1989 | 54 |
| April | 33.3°C23 Apr 2012 | -3.9°C2 Apr 1975 | 23 mm17 Apr 1988 | 54 mm1988 · driest 0 mm in 2002 | 54 |
| May | 39.4°C31 May 2002 | -0.6°C1 May 1967 | 37 mm23 May 2009 | 62 mm2009 · driest 0 mm in 2004 | 53 |
| June | 41.7°C27 Jun 1970 | 5.6°C14 Jun 2010 | 13 mm20 Jun 1967 | 24 mm1972 · driest 0 mm in 1978 | 52 |
| July | 42.8°C5 Jul 1985 | 13.3°C6 Jul 1982 | 21 mm24 Jul 1983 | 43 mm1992 · driest 0 mm in 1993 | 53 |
| August | 41.1°C10 Aug 1969 | 7.8°C23 Aug 1968 | 50 mm31 Aug 1963 | 63 mm1963 · driest 0 mm in 1976 | 53 |
| September | 37.8°C8 Sep 1977 | 4.4°C26 Sep 1970 | 33 mm26 Sep 1983 | 82 mm1997 · driest 0 mm in 1979 | 52 |
| October | 33.9°C3 Oct 1963 | -4.4°C30 Oct 1971 | 34 mm22 Oct 2000 | 99 mm1972 · driest 0 mm in 1976 | 53 |
| November | 25.0°C3 Nov 1988 | -8.9°C28 Nov 1976 | 25 mm8 Nov 1979 | 52 mm1978 · driest 0 mm in 1980 | 54 |
| December | 18.9°C5 Dec 1980 | -17.2°C24 Dec 1990 | 19 mm26 Dec 1979 | 51 mm1978 · driest 0 mm in 2005 | 53 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | <1 | <1 |
| February | 0 | 0 | 16 | <1 | <1 |
| March | <1 | 0 | 5 | <1 | <1 |
| April | 8 | <1 | 1 | <1 | <1 |
| May | 21 | 11 | 0 | <1 | 0 |
| June | 28 | 24 | 0 | 0 | 0 |
| July | 30 | 30 | 0 | <1 | 0 |
| August | 31 | 28 | 0 | <1 | 0 |
| September | 26 | 15 | 0 | <1 | 0 |
| October | 9 | 1 | <1 | 1 | 0 |
| November | 0 | 0 | 9 | <1 | 0 |
| December | 0 | 0 | 25 | <1 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 9% | <1% | 5% | 3.0–9.2°C |
| February | <1% | 11% | <1% | 8% | 7.9–12.8°C |
| March | 23% | 11% | 1% | 6% | 13.1–18.5°C |
| April | 60% | 7% | <1% | 4% | 18.1–24.0°C |
| May | 87% | 6% | <1% | 3% | 24.1–29.4°C |
| June | 97% | 3% | <1% | <1% | 31.1–35.2°C |
| July | 91% | 9% | <1% | 6% | 34.3–37.4°C |
| August | 88% | 12% | 1% | 7% | 32.7–35.8°C |
| September | 89% | 10% | 1% | 6% | 27.7–30.8°C |
| October | 65% | 10% | 2% | 8% | 19.2–24.5°C |
| November | 6% | 7% | 1% | 2% | 10.5–14.8°C |
| December | 0% | 8% | <1% | 4% | 3.5–8.7°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