United States · 1991–2020

Best time to visit
Thermalito.

October leads for comfortable weather in Thermalito: typically 26°C by day, 9.5°C at night, with 40 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high26°C

Typical low9.5°C

Rain in October40 mm

Comfort

October

October · May · April

83climate match

Beach

June

June · September · May

70climate match

Outdoors

April

April · October · November

82climate match

The weakest month is December, scoring 25 against October’s 83 — days reach only 13.7°C, 10° below the 24°C the score treats as ideal, and nights drop to 3.5°C.

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

2613.9° / 3.4°

Feb

3516.4° / 4.9°

Mar

5119.2° / 6.5°

Apr

7822.6° / 8°

May

8127.6° / 11.1°

Jun

7032.5° / 14.1°

Jul

5935.7° / 16.3°

Aug

6434.8° / 15.2°

Sep

7131.7° / 12.9°

Oct

8326° / 9.5°

Nov

5618.3° / 5.8°

Dec

2513.7° / 3.5°

Monthly climate evidence for Thermalito — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	13.9°C	3.4°C	136 mm	9.6	9 h 40	26	Strong coverage
February	16.4°C	4.9°C	151 mm	9.5	10 h 39	35	Strong coverage
March	19.2°C	6.5°C	124 mm	9	11 h 49	51	Strong coverage
April	22.6°C	8°C	54 mm	5.5	13 h 11	78	Strong coverage
May	27.6°C	11.1°C	34 mm	3.4	14 h 19	81	Strong coverage
June	32.5°C	14.1°C	14 mm	1.5	14 h 56	70	Strong coverage
July	35.7°C	16.3°C	0 mm	0.1	14 h 42	59	Strong coverage
August	34.8°C	15.2°C	3 mm	0.3	13 h 43	64	Strong coverage
September	31.7°C	12.9°C	9 mm	0.7	12 h 24	71	Strong coverage
October	26°C	9.5°C	40 mm	3	11 h 05	83	Strong coverage
November	18.3°C	5.8°C	80 mm	5.9	9 h 57	56	Strong coverage
December	13.7°C	3.5°C	137 mm	9.4	9 h 23	25	Strong coverage

What has changed

Thermalito runs +1.2°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

+2.8

Feb

+1.0

Mar

+0.7

Apr

+1.5

May

+0.8

Jun

+1.4

Jul

+0.6

Aug

+0.3

Sep

+1.0

Oct

+0.8

Nov

+1.1

Dec

+2.1

October daytime highs, 2011–2025. Last recorded: 24.1°C.

Records at OROVILLE, 1953–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	27.8°C16 Jan 2009	-5.6°C2 Jan 1960	96 mm10 Jan 1995	414 mm1995 · driest 0 mm in 2007	65
February	28.9°C9 Feb 2022	-5.6°C3 Feb 1957	155 mm11 Feb 2009	398 mm2019 · driest 0 mm in 2020	65
March	36.1°C17 Mar 2007	-3.3°C6 Mar 1956	122 mm6 Mar 2019	370 mm1991 · driest 0 mm in 2026	65
April	36.7°C24 Apr 2019	-1.7°C11 Apr 1991	58 mm6 Apr 2018	175 mm1963 · driest 0 mm in 2009	66
May	40.0°C31 May 2001	-1.1°C12 May 1999	51 mm12 May 2020	107 mm1998 · driest 0 mm in 2018	66
June	46.1°C16 Jun 1961	1.7°C11 Jun 1995	45 mm29 Jun 2011	79 mm2011 · driest 0 mm in 1959	62
July	46.1°C6 Jul 2024	6.7°C9 Jul 2002	40 mm8 Jul 1974	41 mm1974 · driest 0 mm in 1985	63
August	45.0°C11 Aug 1971	5.6°C31 Aug 1995	38 mm16 Aug 1993	38 mm1993 · driest 0 mm in 1955	64
September	45.0°C6 Sep 2022	3.9°C17 Sep 1990	51 mm5 Sep 2017	79 mm1985 · driest 0 mm in 1953	65
October	38.9°C1 Oct 2024	-0.6°C29 Oct 1971	129 mm13 Oct 1962	301 mm1962 · driest 0 mm in 2006	65
November	32.2°C2 Nov 1967	-5.0°C30 Nov 2010	73 mm30 Nov 1998	264 mm1983 · driest 0 mm in 1959	64
December	26.1°C3 Dec 1985	-11.1°C22 Dec 1990	71 mm6 Dec 1955	376 mm1955 · driest 0 mm in 1989	64

Typical days per month at OROVILLE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	5	5
February	<1	0	2	5
March	3	<1	<1	4
April	9	3	<1	2
May	20	10	<1	1
June	26	21	0	<1
July	29	28	0	0
August	29	27	0	<1
September	26	20	0	<1
October	17	6	0	1
November	2	0	2	3
December	0	0	5	5

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 83); on 2011–2025 it is April (87). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in OROVILLE’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	4%	30%	15%	38%	11.1–15.6°C
February	16%	31%	16%	36%	14.1–19.0°C
March	38%	28%	13%	31%	16.1–21.8°C
April	64%	18%	7%	19%	19.1–25.8°C
May	86%	10%	3%	7%	24.8–29.6°C
June	96%	4%	1%	2%	30.3–35.2°C
July	100%	<1%	<1%	0%	34.1–38.0°C
August	99%	1%	<1%	0%	33.3–36.6°C
September	97%	4%	1%	3%	30.1–33.7°C
October	84%	11%	4%	10%	23.9–28.7°C
November	33%	22%	11%	27%	16.0–20.8°C
December	3%	28%	15%	35%	11.2–15.5°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.

1954Each stripe is one year’s mean temperature against the 49-year average. Warmest: 2024. Coolest: 2011.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5402159
NOAA station: USC00046521 · OROVILLE
Station distance: 3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 39.51°, 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.

These places read the same station, so their numbers are identical — distance from OROVILLE is what differs

Oroville→Oroville East→South Oroville→Palermo→Berry Creek→Bidwell (historical)→

Or put two places side by side: Thermalito vs Oroville

Best time to visitThermalito.