United States · 1991–2020

Best time to visit
Rio Dell.

August leads for comfortable weather in Rio Dell: typically 22.4°C by day, 12.2°C at night, with 2 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high22.4°C

Typical low12.2°C

Rain in August2 mm

Comfort

August

August · September · July

90climate match

Beach

August

August · September · July

56climate match

Outdoors

June

June · July · September

98climate match

The weakest month is December, scoring 7 against August’s 90 — days reach only 13.2°C, 11° below the 24°C the score treats as ideal, and 245 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

1414° / 5.5°

Feb

2114.7° / 5.7°

Mar

2715.5° / 6.3°

Apr

4616.6° / 7.3°

May

6518.2° / 9.2°

Jun

7919.9° / 10.8°

Jul

8721.6° / 12°

Aug

9022.4° / 12.2°

Sep

8922.8° / 11°

Oct

7320.6° / 8.9°

Nov

3816.2° / 7°

Dec

713.2° / 5.1°

Monthly climate evidence for Rio Dell — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 27 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	14°C	5.5°C	219 mm	13.9	11.3°C	9 h 34	14	Strong coverage
February	14.7°C	5.7°C	197 mm	12.6	11.1°C	10 h 36	21	Strong coverage
March	15.5°C	6.3°C	180 mm	13.2	10.9°C	11 h 49	27	Strong coverage
April	16.6°C	7.3°C	100 mm	10.9	10.8°C	13 h 13	46	Strong coverage
May	18.2°C	9.2°C	49 mm	6.7	11.0°C	14 h 24	65	Strong coverage
June	19.9°C	10.8°C	14 mm	2.7	11.3°C	15 h 03	79	Strong coverage
July	21.6°C	12°C	4 mm	0.7	11.7°C	14 h 48	87	Strong coverage
August	22.4°C	12.2°C	2 mm	0.5	12.4°C	13 h 47	90	Strong coverage
September	22.8°C	11°C	12 mm	2	12.5°C	12 h 25	89	Strong coverage
October	20.6°C	8.9°C	60 mm	4.8	12.1°C	11 h 03	73	Strong coverage
November	16.2°C	7°C	135 mm	11.2	12.1°C	9 h 52	38	Strong coverage
December	13.2°C	5.1°C	245 mm	14.2	11.7°C	9 h 17	7	Strong coverage

What has changed

Rio Dell runs +1.1°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

+1.3

Feb

0.0

Mar

+0.8

Apr

+1.4

May

+1.5

Jun

+1.6

Jul

+1.2

Aug

+1.7

Sep

+1.6

Oct

+1.3

Nov

+0.7

Dec

+0.2

August daytime highs, 2011–2025. Last recorded: 22.8°C.

Records at SCOTIA, 1926–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C29 Jan 1940	-6.7°C10 Jan 1949	120 mm1 Jan 1997	671 mm1995 · driest 14 mm in 1985	100
February	27.8°C17 Feb 1930	-5.0°C6 Feb 1989	118 mm6 Feb 2015	547 mm1958 · driest 4 mm in 1988	101
March	30.0°C4 Mar 1929	-1.7°C18 Mar 1946	113 mm9 Mar 1995	420 mm1938 · driest 0 mm in 1926	101
April	33.3°C30 Apr 2014	-0.6°C13 Apr 2023	74 mm23 Apr 1983	355 mm2003 · driest 5 mm in 1949	101
May	36.1°C15 May 2008	0.6°C7 May 1950	41 mm4 May 2024	138 mm1942 · driest 1 mm in 1947	101
June	34.4°C18 Jun 1945	4.4°C2 Jun 1977	29 mm18 Jun 2005	91 mm1988 · driest 0 mm in 1945	101
July	33.9°C6 Jul 2024	4.4°C11 Jul 1991	18 mm17 Jul 1991	25 mm1991 · driest 0 mm in 1999	100
August	33.9°C15 Aug 2020	5.0°C31 Aug 1957	43 mm30 Aug 1983	80 mm1983 · driest 0 mm in 1944	98
September	40.0°C2 Sep 2017	2.8°C30 Sep 1950	51 mm27 Sep 1957	98 mm1986 · driest 0 mm in 1993	98
October	36.1°C3 Oct 1980	-2.2°C29 Oct 1971	109 mm25 Oct 1979	370 mm1950 · driest 1 mm in 2002	99
November	27.2°C3 Nov 1931	-2.8°C11 Nov 1978	136 mm30 Nov 1926	547 mm1973 · driest 0 mm in 1929	100
December	22.8°C31 Dec 1963	-8.3°C12 Dec 1932	151 mm10 Dec 1939	697 mm2002 · driest 3 mm in 1989	99

Typical days per month at SCOTIA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	2	7
February	<1	0	1	6
March	<1	0	<1	6
April	1	<1	0	4
May	2	<1	0	2
June	2	<1	0	<1
July	3	<1	0	<1
August	5	<1	0	0
September	7	1	0	<1
October	5	<1	0	2
November	<1	0	<1	5
December	0	0	2	7

How often, not how much — every day in SCOTIA’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	2%	43%	22%	58%	10.8–15.0°C
February	6%	43%	22%	57%	11.9–16.4°C
March	9%	43%	19%	55%	12.7–16.9°C
April	12%	32%	9%	40%	13.8–17.8°C
May	19%	19%	4%	19%	15.8–19.4°C
June	37%	9%	1%	5%	17.7–20.8°C
July	62%	2%	<1%	<1%	19.4–22.3°C
August	74%	3%	<1%	2%	20.1–23.1°C
September	66%	8%	2%	6%	20.0–23.7°C
October	40%	19%	7%	23%	18.1–21.4°C
November	13%	37%	17%	52%	14.3–17.6°C
December	<1%	45%	23%	58%	11.1–14.7°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.

1926Each stripe is one year’s mean temperature against the 96-year average. Warmest: 1941. Coolest: 1971.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5570299
NOAA station: USC00048045 · SCOTIA
Station distance: 1.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 40.50°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 27 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 SCOTIA is what differs

Fortuna→Ferndale→Hydesville→Scotia→Alton→Arlynda Corners→

Or put two places side by side: Rio Dell vs Fortuna

Best time to visitRio Dell.

August

August

June

The whole year,without the guesswork.

Rio Dell runs +1.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Rio Dell.

The whole year,
without the guesswork.

Rio Dell runs +1.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.