July
July · August · September
United States · 1991–2020
July leads for comfortable weather in Chico: typically 24.8°C by day, 12.6°C at night, with 22 mm of rain. Based on measured 1991–2020 NOAA station history.
July · August · September
August · July · September
June · September · May
The weakest month is January, scoring 5 against July’s 93 — days reach only 8°C, 16° 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 | 8°C | 2°C | 222 mm | 16.2 | 8 h 49 | 5 | Strong coverage |
| February | 9.7°C | 1.7°C | 146 mm | 12.8 | 10 h 10 | 5 | Strong coverage |
| March | 12.2°C | 3.3°C | 154 mm | 15.4 | 11 h 44 | 12 | Strong coverage |
| April | 15.1°C | 5.1°C | 95 mm | 12.7 | 13 h 33 | 36 | Strong coverage |
| May | 18.9°C | 8.1°C | 54 mm | 9.1 | 15 h 06 | 63 | Strong coverage |
| June | 21.2°C | 10.5°C | 41 mm | 7.9 | 15 h 57 | 78 | Strong coverage |
| July | 24.8°C | 12.6°C | 22 mm | 3.7 | 15 h 37 | 93 | Strong coverage |
| August | 25.1°C | 12.8°C | 28 mm | 3.9 | 14 h 16 | 92 | Strong coverage |
| September | 22.2°C | 10.6°C | 51 mm | 6.2 | 12 h 30 | 81 | Strong coverage |
| October | 15.9°C | 7.1°C | 134 mm | 12 | 10 h 46 | 37 | Strong coverage |
| November | 10.6°C | 3.7°C | 238 mm | 15.3 | 9 h 13 | 5 | Strong coverage |
| December | 7.6°C | 1.7°C | 243 mm | 16.4 | 8 h 27 | 5 | 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 | 17.8°C28 Jan 1920 | -11.1°C24 Jan 1969 | 109 mm7 Jan 2002 | 510 mm1953 · driest 18 mm in 1985 | 77 |
| February | 22.2°C9 Feb 1918 | -11.1°C3 Feb 1989 | 79 mm24 Feb 1999 | 458 mm1999 · driest 16 mm in 1993 | 80 |
| March | 26.7°C30 Mar 2004 | -7.2°C3 Mar 1989 | 85 mm10 Mar 1903 | 314 mm2014 · driest 23 mm in 1965 | 78 |
| April | 31.7°C19 Apr 2016 | -5.0°C8 Apr 2001 | 64 mm23 Apr 1996 | 195 mm1993 · driest 9 mm in 1956 | 80 |
| May | 33.3°C29 May 1983 | -2.8°C25 May 1964 | 42 mm30 May 1987 | 139 mm1984 · driest 8 mm in 1972 | 84 |
| June | 38.9°C28 Jun 2021 | 2.8°C10 Jun 2003 | 50 mm12 Jun 2000 | 115 mm1964 · driest 1 mm in 2019 | 85 |
| July | 37.2°C12 Jul 2007 | 3.9°C15 Jul 1903 | 43 mm15 Jul 1916 | 79 mm1974 · driest 0 mm in 2017 | 81 |
| August | 38.3°C10 Aug 1981 | 4.4°C14 Aug 1955 | 47 mm22 Aug 2004 | 101 mm1975 · driest 0 mm in 2012 | 78 |
| September | 36.1°C3 Sep 1988 | -1.1°C21 Sep 2003 | 56 mm29 Sep 2013 | 186 mm2013 · driest 0 mm in 1993 | 83 |
| October | 31.1°C17 Oct 2022 | -2.8°C29 Oct 1971 | 101 mm21 Oct 2003 | 378 mm2016 · driest 5 mm in 1987 | 80 |
| November | 23.3°C27 Nov 1901 | -12.2°C15 Nov 1955 | 107 mm24 Nov 1990 | 550 mm2006 · driest 42 mm in 1976 | 77 |
| December | 21.7°C13 Dec 1918 | -13.9°C21 Dec 1990 | 191 mm3 Dec 2007 | 412 mm2012 · driest 46 mm in 1985 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 10 | 7 | <1 |
| February | 0 | 0 | 10 | 5 | <1 |
| March | <1 | 0 | 5 | 5 | <1 |
| April | <1 | 0 | 1 | 3 | 0 |
| May | 4 | <1 | <1 | 1 | 0 |
| June | 6 | 2 | 0 | <1 | 0 |
| July | 15 | 4 | 0 | <1 | 0 |
| August | 16 | 4 | 0 | <1 | 0 |
| September | 8 | 1 | 0 | 2 | 0 |
| October | <1 | 0 | <1 | 4 | 0 |
| November | 0 | 0 | 5 | 8 | <1 |
| December | 0 | 0 | 10 | 8 | <1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 94); on 2011–2025 it is July (91). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 49% | 21% | 61% | 5.9–9.5°C |
| February | <1% | 43% | 17% | 56% | 7.6–11.7°C |
| March | 2% | 42% | 14% | 53% | 9.7–13.8°C |
| April | 11% | 34% | 7% | 42% | 13.1–16.8°C |
| May | 31% | 26% | 4% | 28% | 16.3–20.8°C |
| June | 50% | 21% | 3% | 22% | 19.1–23.7°C |
| July | 79% | 10% | 2% | 6% | 22.2–26.4°C |
| August | 81% | 11% | 2% | 10% | 22.1–26.9°C |
| September | 57% | 19% | 5% | 19% | 19.6–23.7°C |
| October | 13% | 34% | 12% | 44% | 14.5–17.5°C |
| November | <1% | 50% | 23% | 67% | 8.9–12.4°C |
| December | <1% | 50% | 22% | 65% | 5.4–9.1°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