December
December · November · February
United States · 1991–2020
December leads for comfortable weather in Ona: typically 23.9°C by day, 10.4°C at night, with 46 mm of rain. Based on measured 1991–2020 NOAA station history.
December · November · February
October · April · May
December · January · February
The weakest month is August, scoring 22 against December’s 89 — days average 33.3°C, 9° above the 24°C the score treats as ideal, and 208 mm of rain falls.
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 | 22.8°C | 8.7°C | 58 mm | 4.1 | 10 h 35 | 81 | Strong coverage |
| February | 24.4°C | 10°C | 55 mm | 3.8 | 11 h 11 | 86 | Strong coverage |
| March | 26.2°C | 11.5°C | 67 mm | 4.1 | 11 h 55 | 81 | Strong coverage |
| April | 29°C | 14.4°C | 69 mm | 4 | 12 h 47 | 77 | Strong coverage |
| May | 31.4°C | 17.7°C | 89 mm | 5.5 | 13 h 29 | 61 | Strong coverage |
| June | 32.6°C | 21.2°C | 219 mm | 12.5 | 13 h 52 | 26 | Strong coverage |
| July | 33.2°C | 22.3°C | 195 mm | 12.3 | 13 h 43 | 26 | Strong coverage |
| August | 33.3°C | 22.6°C | 208 mm | 12.9 | 13 h 07 | 22 | Strong coverage |
| September | 32.3°C | 21.9°C | 155 mm | 10.1 | 12 h 17 | 37 | Strong coverage |
| October | 29.8°C | 18.3°C | 79 mm | 5.5 | 11 h 28 | 67 | Strong coverage |
| November | 26.4°C | 13.3°C | 48 mm | 3.2 | 10 h 45 | 87 | Strong coverage |
| December | 23.9°C | 10.4°C | 46 mm | 3.8 | 10 h 25 | 89 | 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 | 32.2°C20 Jan 1947 | -6.7°C12 Jan 1982 | 70 mm24 Jan 1998 | 199 mm1979 · driest 0 mm in 2000 | 93 |
| February | 33.9°C25 Feb 1962 | -6.7°C2 Feb 2026 | 112 mm17 Feb 1998 | 227 mm1936 · driest 0 mm in 2001 | 92 |
| March | 34.4°C27 Mar 1974 | -5.0°C3 Mar 1980 | 146 mm2 Mar 1965 | 308 mm1998 · driest 0 mm in 2002 | 93 |
| April | 37.2°C26 Apr 1945 | 1.1°C8 Apr 1950 | 141 mm13 Apr 1953 | 210 mm1951 · driest 0 mm in 1967 | 93 |
| May | 40.0°C31 May 1945 | 4.4°C6 May 1945 | 145 mm1 May 1954 | 354 mm2018 · driest 0 mm in 2000 | 94 |
| June | 39.4°C1 Jun 1945 | 10.6°C1 Jun 1984 | 176 mm24 Jun 1945 | 493 mm1939 · driest 43 mm in 1998 | 93 |
| July | 38.9°C5 Jul 1945 | 16.1°C9 Jul 1982 | 120 mm29 Jul 1960 | 395 mm1946 · driest 51 mm in 2016 | 92 |
| August | 37.8°C9 Aug 2023 | 16.1°C13 Aug 2008 | 176 mm27 Aug 1949 | 394 mm1949 · driest 68 mm in 1982 | 93 |
| September | 37.2°C20 Sep 1961 | 12.8°C27 Sep 1956 | 471 mm28 Sep 2022 | 739 mm2022 · driest 30 mm in 1961 | 91 |
| October | 36.1°C10 Oct 2009 | 2.8°C29 Oct 2008 | 172 mm14 Oct 1938 | 263 mm1975 · driest 0 mm in 1940 | 90 |
| November | 33.3°C8 Nov 2015 | -4.4°C26 Nov 1950 | 193 mm14 Nov 1997 | 284 mm1987 · driest 0 mm in 2003 | 91 |
| December | 33.3°C7 Dec 1978 | -6.1°C13 Dec 1962 | 101 mm24 Dec 1986 | 200 mm2002 · driest 0 mm in 2001 | 92 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 13 | <1 | 3 | 2 |
| February | 16 | 3 | <1 | 2 |
| March | 22 | 6 | <1 | 2 |
| April | 27 | 14 | 0 | 2 |
| May | 31 | 25 | 0 | 3 |
| June | 30 | 27 | 0 | 7 |
| July | 31 | 30 | 0 | 6 |
| August | 31 | 30 | 0 | 7 |
| September | 30 | 28 | 0 | 5 |
| October | 29 | 17 | 0 | 3 |
| November | 23 | 4 | 0 | 1 |
| December | 16 | 2 | <1 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 68% | 14% | 6% | 8% | 20.3–26.0°C |
| February | 71% | 17% | 8% | 13% | 21.9–27.5°C |
| March | 80% | 16% | 7% | 11% | 24.5–29.1°C |
| April | 86% | 14% | 7% | 10% | 27.8–30.8°C |
| May | 79% | 21% | 10% | 25% | 30.5–33.3°C |
| June | 58% | 42% | 21% | 58% | 31.6–34.2°C |
| July | 54% | 45% | 21% | 64% | 32.4–34.3°C |
| August | 54% | 46% | 20% | 66% | 32.7–34.2°C |
| September | 62% | 38% | 19% | 48% | 31.2–33.2°C |
| October | 82% | 19% | 7% | 16% | 28.3–31.2°C |
| November | 83% | 13% | 4% | 7% | 24.9–28.1°C |
| December | 73% | 14% | 5% | 8% | 22.0–26.1°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