June
June · September · July
United States · 1991–2020
June leads for comfortable weather in Prosser Lake Heights: typically 23.7°C by day, 2.9°C at night, with 15 mm of rain. Based on measured 1991–2020 NOAA station history.
June · September · July
July · August · June
May · June · September
The weakest month is January, scoring 5 against June’s 77 — days reach only 5.1°C, 19° below the 24°C the score treats as ideal, and nights drop to -8.5°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 | 5.1°C | -8.5°C | 149 mm | 10.1 | 9 h 41 | 5 | Good coverage |
| February | 6.6°C | -7.3°C | 131 mm | 9.4 | 10 h 39 | 5 | Good coverage |
| March | 9.7°C | -5.3°C | 104 mm | 8.7 | 11 h 49 | 5 | Good coverage |
| April | 12.4°C | -3.2°C | 54 mm | 6.8 | 13 h 11 | 23 | Good coverage |
| May | 18.3°C | 0.4°C | 37 mm | 5.1 | 14 h 19 | 53 | Good coverage |
| June | 23.7°C | 2.9°C | 15 mm | 2.6 | 14 h 55 | 77 | Good coverage |
| July | 28.6°C | 5.9°C | 5 mm | 1.3 | 14 h 41 | 68 | Good coverage |
| August | 28.2°C | 5.1°C | 11 mm | 1.4 | 13 h 42 | 68 | Good coverage |
| September | 24.4°C | 1.9°C | 14 mm | 1.8 | 12 h 24 | 75 | Good coverage |
| October | 18°C | -1.9°C | 35 mm | 3.7 | 11 h 06 | 49 | Good coverage |
| November | 10°C | -5.3°C | 66 mm | 6.7 | 9 h 58 | 10 | Good coverage |
| December | 4.8°C | -8.2°C | 145 mm | 10.1 | 9 h 24 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.8°C21 Jan 1950 | -33.3°C21 Jan 1937 | 114 mm3 Jan 1916 | 532 mm1914 · driest 0 mm in 1911 | 91 |
| February | 20.0°C28 Feb 1986 | -30.6°C27 Feb 1962 | 132 mm1 Feb 1963 | 483 mm1986 · driest 0 mm in 1912 | 89 |
| March | 22.8°C17 Mar 2007 | -27.8°C16 Mar 1917 | 91 mm18 Mar 1907 | 521 mm1907 · driest 1 mm in 1914 | 90 |
| April | 28.3°C11 Apr 1915 | -17.2°C27 Apr 1955 | 105 mm3 Apr 1958 | 208 mm1935 · driest 0 mm in 1916 | 91 |
| May | 33.3°C29 May 1910 | -12.2°C2 May 1915 | 56 mm16 May 1996 | 106 mm1996 · driest 0 mm in 1911 | 89 |
| June | 34.4°C25 Jun 2006 | -7.2°C5 Jun 1962 | 33 mm28 Jun 2006 | 67 mm1969 · driest 0 mm in 1912 | 85 |
| July | 37.8°C11 Jul 2002 | -9.4°C1 Jul 1976 | 39 mm9 Jul 1974 | 56 mm1913 · driest 0 mm in 1981 | 87 |
| August | 38.3°C28 Aug 1915 | -6.7°C18 Aug 1912 | 31 mm8 Aug 1989 | 77 mm1965 · driest 0 mm in 1938 | 87 |
| September | 35.0°C14 Sep 1937 | -8.9°C30 Sep 1950 | 41 mm6 Sep 1998 | 108 mm1998 · driest 0 mm in 2002 | 88 |
| October | 30.6°C9 Oct 1996 | -15.0°C31 Oct 1919 | 74 mm13 Oct 1962 | 217 mm1962 · driest 0 mm in 1919 | 89 |
| November | 27.8°C2 Nov 1913 | -25.6°C30 Nov 2004 | 79 mm10 Nov 1944 | 331 mm1983 · driest 0 mm in 1959 | 85 |
| December | 24.4°C2 Dec 1949 | -30.0°C9 Dec 1972 | 127 mm23 Dec 1964 | 601 mm1955 · driest 0 mm in 1912 | 89 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 5 | 9 |
| February | 0 | 0 | 27 | 4 | 8 |
| March | 0 | 0 | 29 | 3 | 7 |
| April | <1 | 0 | 27 | 2 | 5 |
| May | 5 | <1 | 15 | <1 | 2 |
| June | 15 | 2 | 6 | <1 | <1 |
| July | 27 | 12 | <1 | <1 | 0 |
| August | 26 | 10 | 2 | <1 | 0 |
| September | 16 | 3 | 9 | <1 | <1 |
| October | 4 | <1 | 24 | 1 | 1 |
| November | 0 | 0 | 28 | 2 | 4 |
| December | 0 | 0 | 29 | 4 | 8 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 31% | 16% | 38% | 1.4–7.5°C |
| February | 0% | 31% | 15% | 40% | 2.5–8.8°C |
| March | 1% | 30% | 12% | 37% | 4.4–11.8°C |
| April | 10% | 21% | 6% | 22% | 8.2–16.2°C |
| May | 35% | 17% | 3% | 16% | 13.4–20.9°C |
| June | 71% | 9% | 1% | 5% | 19.6–25.5°C |
| July | 93% | 5% | <1% | 3% | 25.8–30.2°C |
| August | 92% | 4% | <1% | 2% | 25.0–29.8°C |
| September | 78% | 7% | 2% | 5% | 20.0–26.3°C |
| October | 40% | 12% | 4% | 11% | 14.0–21.4°C |
| November | 3% | 22% | 9% | 26% | 6.3–13.7°C |
| December | <1% | 28% | 13% | 34% | 2.5–8.2°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