October
October · May · June
85climate match
United States · 1991–2020
Best time to visit
Lake Berryessa.
October leads for comfortable weather in Lake Berryessa: typically 22.7°C by day, 10.2°C at night, with 48 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortOctober
Typical high22.7°C
Typical low10.2°C
Rain in October48 mm
July
July · August · September
75climate match
October
October · May · April
89climate match
The weakest month is December, scoring 8 against October’s 85 — days reach only 11.8°C, 12° below the 24°C the score treats as ideal, and 213 mm of rain falls.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
1312.4° / 4.4°
Feb
1813.5° / 4.7°
Mar
3516.1° / 5.3°
Apr
6119° / 6.1°
May
8322.8° / 8.5°
Jun
8326.8° / 10.9°
Jul
7829.4° / 12.5°
Aug
7829.3° / 12.5°
Sep
8327.7° / 12.2°
Oct
8522.7° / 10.2°
Nov
4315.7° / 6.4°
Dec
811.8° / 4.2°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 12.4°C | 4.4°C | 196 mm | 11.1 | 9 h 44 | 13 | Strong coverage |
| February | 13.5°C | 4.7°C | 200 mm | 9.8 | 10 h 41 | 18 | Strong coverage |
| March | 16.1°C | 5.3°C | 145 mm | 9.6 | 11 h 50 | 35 | Strong coverage |
| April | 19°C | 6.1°C | 64 mm | 6.1 | 13 h 09 | 61 | Strong coverage |
| May | 22.8°C | 8.5°C | 39 mm | 3.5 | 14 h 15 | 83 | Strong coverage |
| June | 26.8°C | 10.9°C | 8 mm | 1.1 | 14 h 51 | 83 | Strong coverage |
| July | 29.4°C | 12.5°C | 0 mm | 0 | 14 h 37 | 78 | Strong coverage |
| August | 29.3°C | 12.5°C | 1 mm | 0.1 | 13 h 40 | 78 | Strong coverage |
| September | 27.7°C | 12.2°C | 4 mm | 0.8 | 12 h 23 | 83 | Strong coverage |
| October | 22.7°C | 10.2°C | 48 mm | 3.2 | 11 h 07 | 85 | Strong coverage |
| November | 15.7°C | 6.4°C | 105 mm | 7.2 | 10 h 01 | 43 | Strong coverage |
| December | 11.8°C | 4.2°C | 213 mm | 11.3 | 9 h 29 | 8 | Strong coverage |
What has changed
Lake Berryessa runs +0.5°C
on the 1961–1990 baseline.
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.
Jan
+1.6
Feb
+1.3
Mar
+1.1
Apr
+1.5
May
0.0
Jun
-0.2
Jul
-1.5
Aug
-1.1
Sep
+0.1
Oct
+0.7
Nov
+0.9
Dec
+1.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.0°C14 Jan 2009 | -7.2°C22 Jan 1962 | 149 mm21 Jan 1967 | 719 mm1995 · driest 1 mm in 2015 | 71 |
| February | 25.6°C14 Feb 1977 | -6.7°C6 Feb 1989 | 188 mm17 Feb 1986 | 724 mm1986 · driest 0 mm in 2020 | 73 |
| March | 30.6°C20 Mar 2026 | -5.0°C5 Mar 1971 | 156 mm9 Mar 1995 | 486 mm1983 · driest 1 mm in 1988 | 73 |
| April | 32.8°C8 Apr 1989 | -3.9°C13 Apr 1998 | 78 mm11 Apr 1982 | 219 mm1963 · driest 0 mm in 2023 | 73 |
| May | 38.3°C27 May 1984 | -2.8°C6 May 1964 | 58 mm18 May 2005 | 163 mm2005 · driest 0 mm in 1974 | 75 |
| June | 41.1°C15 Jun 1961 | 0.6°C12 Jun 1952 | 36 mm2 Jun 1967 | 78 mm1967 · driest 0 mm in 2020 | 74 |
| July | 43.3°C15 Jul 1972 | 0.0°C4 Jul 1975 | 28 mm9 Jul 1974 | 29 mm1974 · driest 0 mm in 1970 | 74 |
| August | 41.7°C11 Aug 1971 | 3.9°C5 Aug 1954 | 20 mm12 Aug 1965 | 36 mm1976 · driest 0 mm in 2007 | 73 |
| September | 42.2°C1 Sep 1955 | 0.0°C30 Sep 1971 | 100 mm18 Sep 1959 | 101 mm1959 · driest 0 mm in 1952 | 71 |
| October | 37.2°C3 Oct 1980 | -2.8°C29 Oct 1971 | 194 mm24 Oct 2021 | 368 mm1962 · driest 0 mm in 2020 | 71 |
| November | 30.0°C1 Nov 1966 | -4.4°C19 Nov 1977 | 141 mm30 Nov 2012 | 440 mm1973 · driest 0 mm in 1959 | 72 |
| December | 23.9°C2 Dec 1958 | -10.0°C9 Dec 1972 | 163 mm19 Dec 1955 | 761 mm1955 · driest 0 mm in 1989 | 71 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 4 | 5 |
| February | <1 | 0 | 3 | 6 |
| March | 1 | 0 | 2 | 4 |
| April | 4 | <1 | 1 | 2 |
| May | 11 | 3 | <1 | 1 |
| June | 20 | 8 | 0 | <1 |
| July | 28 | 14 | 0 | 0 |
| August | 27 | 13 | 0 | 0 |
| September | 22 | 10 | 0 | <1 |
| October | 11 | 3 | 0 | 1 |
| November | <1 | 0 | 1 | 3 |
| December | 0 | 0 | 4 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 4% | 34% | 18% | 43% | 9.3–14.0°C |
| February | 9% | 33% | 19% | 42% | 10.8–16.2°C |
| March | 20% | 31% | 14% | 37% | 12.4–18.2°C |
| April | 42% | 19% | 7% | 20% | 15.7–21.2°C |
| May | 71% | 10% | 3% | 8% | 19.8–24.8°C |
| June | 92% | 4% | <1% | 2% | 24.2–29.3°C |
| July | 100% | <1% | 0% | 0% | 28.2–32.3°C |
| August | 98% | 1% | <1% | <1% | 27.7–31.7°C |
| September | 93% | 4% | 1% | 2% | 25.5–29.1°C |
| October | 67% | 12% | 5% | 12% | 19.7–25.0°C |
| November | 19% | 26% | 13% | 33% | 12.6–17.8°C |
| December | 2% | 35% | 19% | 44% | 9.5–13.8°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
Nearby, measured,
and named.
- Place identity
- GeoNames 12523216
- NOAA station
- USC00040212 · ANGWIN PACIFIC UNION COLLEGE
- Station distance
- 14.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 38.61°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.