United States · 1991–2020

Best time to visit
Rio Oso.

October leads for comfortable weather in Rio Oso: typically 25.9°C by day, 9.4°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high25.9°C

Typical low9.4°C

Rain in October27 mm

Comfort

October

October · May · April

84climate match

Beach

May

May · June · September

70climate match

Outdoors

April

April · October · March

86climate match

The weakest month is December, scoring 29 against October’s 84 — days reach only 13.3°C, 11° below the 24°C the score treats as ideal, and nights drop to 3.2°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

3313.4° / 3.3°

Feb

4616.4° / 4.5°

Mar

6019.3° / 6.5°

Apr

8022.4° / 8°

May

8128° / 11.4°

Jun

7032.9° / 14.6°

Jul

5935.8° / 16.3°

Aug

6434.7° / 15.3°

Sep

7032° / 13.2°

Oct

8425.9° / 9.4°

Nov

5818.1° / 5.2°

Dec

2913.3° / 3.2°

Monthly climate evidence for Rio Oso — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	13.4°C	3.3°C	81 mm	7.6	9 h 43	33	Good coverage
February	16.4°C	4.5°C	80 mm	6.9	10 h 40	46	Good coverage
March	19.3°C	6.5°C	72 mm	7.4	11 h 50	60	Good coverage
April	22.4°C	8°C	38 mm	5	13 h 10	80	Good coverage
May	28°C	11.4°C	20 mm	2.9	14 h 17	81	Good coverage
June	32.9°C	14.6°C	6 mm	0.7	14 h 53	70	Good coverage
July	35.8°C	16.3°C	0 mm	0	14 h 39	59	Good coverage
August	34.7°C	15.3°C	1 mm	0.2	13 h 41	64	Good coverage
September	32°C	13.2°C	3 mm	0.5	12 h 24	70	Good coverage
October	25.9°C	9.4°C	27 mm	2.8	11 h 07	84	Good coverage
November	18.1°C	5.2°C	52 mm	5.6	9 h 59	58	Good coverage
December	13.3°C	3.2°C	97 mm	9.1	9 h 27	29	Good coverage

Records at MARYSVILLE AP (ASOS), 2000–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C23 Jan 2014	-7.2°C17 Jan 2012	58 mm8 Jan 2017	214 mm2023 · driest 1 mm in 2007	26
February	26.7°C15 Feb 2016	-4.3°C24 Feb 2022	56 mm13 Feb 2019	236 mm2019 · driest 0 mm in 2022	26
March	31.7°C29 Mar 2026	-1.7°C8 Mar 2002	81 mm5 Mar 2016	192 mm2016 · driest 3 mm in 2008	26
April	35.6°C21 Apr 2009	0.0°C12 Apr 2022	42 mm6 Apr 2018	100 mm2006 · driest 1 mm in 2021	26
May	41.7°C31 May 2021	1.7°C11 May 2022	26 mm4 May 2024	83 mm2019 · driest 0 mm in 2021	26
June	43.9°C28 Jun 2009	6.1°C7 Jun 2005	28 mm28 Jun 2011	50 mm2011 · driest 0 mm in 2015	26
July	45.0°C10 Jul 2021	10.6°C22 Jul 2008	1 mm18 Jul 2007	1 mm2007 · driest 0 mm in 2010	25
August	43.3°C16 Aug 2020	8.3°C28 Aug 2022	17 mm24 Aug 2024	17 mm2024 · driest 0 mm in 2005	25
September	46.1°C6 Sep 2022	5.0°C30 Sep 2007	20 mm19 Sep 2022	24 mm2022 · driest 0 mm in 2008	25
October	40.0°C2 Oct 2001	0.0°C12 Oct 2006	44 mm30 Oct 2001	78 mm2004 · driest 0 mm in 2020	26
November	30.0°C1 Nov 2018	-3.2°C30 Nov 2015	57 mm22 Nov 2024	157 mm2024 · driest 6 mm in 2022	26
December	22.8°C7 Dec 2020	-6.7°C9 Dec 2009	85 mm11 Dec 2014	240 mm2005 · driest 2 mm in 2017	26

Typical days per month at MARYSVILLE AP (ASOS), 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	8	3
February	<1	0	3	3
March	4	0	<1	3
April	9	3	<1	2
May	23	11	0	<1
June	29	24	0	<1
July	30	29	0	0
August	31	29	0	0
September	28	21	0	<1
October	19	7	0	<1
November	2	0	3	2
December	0	0	9	4

How often, not how much — every day in MARYSVILLE AP (ASOS)’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	5%	24%	9%	27%	11.4–15.7°C
February	19%	24%	10%	32%	14.7–18.8°C
March	43%	24%	8%	26%	16.5–22.5°C
April	69%	15%	4%	11%	20.0–24.7°C
May	90%	9%	2%	7%	25.5–30.1°C
June	98%	2%	<1%	<1%	31.5–34.8°C
July	100%	0%	0%	0%	34.4–37.5°C
August	99%	<1%	<1%	0%	33.7–36.2°C
September	98%	2%	<1%	<1%	30.3–33.8°C
October	85%	9%	2%	7%	23.7–28.9°C
November	31%	17%	5%	20%	16.1–20.2°C
December	1%	31%	13%	41%	11.6–15.1°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.

2001Each stripe is one year’s mean temperature against the 25-year average. Warmest: 2024. Coolest: 2011.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5387702
NOAA station: USW00093205 · MARYSVILLE AP (ASOS)
Station distance: 15.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 38.96°, 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 MARYSVILLE AP (ASOS) is what differs

Linda→Olivehurst→Plumas Lake→Wheatland→Beale Air Force Base→Sheridan→

Or put two places side by side: Rio Oso vs Linda

Best time to visitRio Oso.

October

May

April

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Rio Oso.

The whole year,
without the guesswork.

Nearby, measured,
and named.