United States · 1991–2020

Best time to visit
Metaline Falls.

September leads for comfortable weather in Metaline Falls: typically 22.7°C by day, 5.4°C at night, with 33 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22.7°C

Typical low5.4°C

Rain in September33 mm

Comfort

September

September · July · August

76climate match

Beach

July

July · August · September

67climate match

Outdoors

September

September · May · June

80climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 0.3°C, 24° below the 24°C the score treats as ideal.

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

50.3° / -6.6°

Feb

53.5° / -6.3°

Mar

68.7° / -3.3°

Apr

3214.4° / -0.1°

May

5519.5° / 4.5°

Jun

7022.4° / 8.3°

Jul

7428.7° / 10.6°

Aug

7229.2° / 9.4°

Sep

7622.7° / 5.4°

Oct

2913.1° / 0.9°

Nov

54.6° / -2.6°

Dec

50.1° / -6.4°

Monthly climate evidence for Metaline Falls — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.3°C	-6.6°C	81 mm	13.4	8 h 40	5	Strong coverage
February	3.5°C	-6.3°C	49 mm	9.2	10 h 05	5	Strong coverage
March	8.7°C	-3.3°C	62 mm	10.1	11 h 43	6	Strong coverage
April	14.4°C	-0.1°C	56 mm	10.2	13 h 37	32	Strong coverage
May	19.5°C	4.5°C	68 mm	10.7	15 h 14	55	Strong coverage
June	22.4°C	8.3°C	78 mm	10.8	16 h 09	70	Strong coverage
July	28.7°C	10.6°C	36 mm	5.7	15 h 47	74	Strong coverage
August	29.2°C	9.4°C	21 mm	3.8	14 h 22	72	Strong coverage
September	22.7°C	5.4°C	33 mm	6	12 h 31	76	Strong coverage
October	13.1°C	0.9°C	62 mm	9.6	10 h 42	29	Strong coverage
November	4.6°C	-2.6°C	86 mm	12.7	9 h 05	5	Strong coverage
December	0.1°C	-6.4°C	90 mm	13.7	8 h 16	5	Strong coverage

What has changed

Metaline Falls 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

+1.0

Feb

-0.4

Mar

+0.3

Apr

+0.5

May

+1.9

Jun

+1.8

Jul

+3.3

Aug

+2.5

Sep

+1.5

Oct

+0.3

Nov

-0.1

Dec

+0.5

September daytime highs, 2011–2025. Last recorded: 27.5°C.

Records at BOUNDARY DAM, 1965–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	10.0°C8 Jan 2001	-28.9°C13 Jan 2024	36 mm10 Jan 2006	166 mm2006 · driest 7 mm in 1985	57
February	14.4°C18 Feb 1987	-26.1°C5 Feb 2014	28 mm16 Feb 2017	142 mm1979 · driest 1 mm in 2005	57
March	22.8°C31 Mar 2004	-20.6°C4 Mar 2019	34 mm23 Mar 1967	135 mm2012 · driest 9 mm in 2021	56
April	32.2°C25 Apr 1977	-10.0°C1 Apr 2008	38 mm11 Apr 2023	112 mm1996 · driest 12 mm in 2020	58
May	35.6°C31 May 1986	-5.6°C2 May 2008	51 mm27 May 1998	163 mm1998 · driest 10 mm in 2021	58
June	43.9°C30 Jun 2021	-1.1°C11 Jun 2008	49 mm20 Jun 2013	238 mm2012 · driest 21 mm in 1974	58
July	43.3°C1 Jul 2021	1.1°C11 Jul 2008	51 mm21 Jul 1997	133 mm1997 · driest 0 mm in 2004	59
August	40.0°C1 Aug 2021	0.0°C29 Aug 1984	43 mm24 Aug 1983	113 mm1976 · driest 0 mm in 1969	58
September	37.8°C4 Sep 2025	-5.6°C28 Sep 1984	38 mm29 Sep 2013	119 mm2013 · driest 2 mm in 1990	58
October	26.7°C7 Oct 2003	-12.8°C31 Oct 1984	46 mm14 Oct 2016	222 mm2016 · driest 1 mm in 1974	57
November	16.1°C4 Nov 1975	-28.3°C29 Nov 1985	37 mm4 Nov 1983	176 mm1983 · driest 18 mm in 1979	58
December	11.7°C2 Dec 2021	-33.3°C30 Dec 1968	45 mm15 Dec 2002	161 mm1998 · driest 17 mm in 1985	56

Typical days per month at BOUNDARY DAM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	2	10
February	0	0	27	1	5
March	0	0	27	2	2
April	<1	0	16	1	<1
May	5	1	3	2	0
June	9	3	0	3	0
July	23	14	0	1	0
August	25	15	0	<1	0
September	11	3	2	<1	0
October	<1	0	13	2	<1
November	0	0	23	3	4
December	0	0	30	3	10

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 82); on 2011–2025 it is June (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in BOUNDARY DAM’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	0%	40%	7%	51%	-2.3–2.0°C
February	0%	33%	5%	41%	1.3–5.4°C
March	<1%	31%	5%	41%	6.8–11.1°C
April	15%	31%	4%	40%	11.5–17.0°C
May	34%	34%	7%	45%	16.1–22.6°C
June	54%	34%	8%	43%	19.2–26.3°C
July	79%	19%	3%	18%	24.2–31.9°C
August	82%	17%	3%	19%	25.3–30.7°C
September	62%	20%	3%	20%	19.3–25.8°C
October	10%	29%	5%	39%	11.8–15.3°C
November	0%	42%	9%	56%	2.8–6.3°C
December	0%	43%	9%	60%	-2.4–1.8°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.

1966Each stripe is one year’s mean temperature against the 52-year average. Warmest: 2015. Coolest: 2008.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5803199
NOAA station: USC00450844 · BOUNDARY DAM
Station distance: 14.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 48.86°, 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 BOUNDARY DAM is what differs

Salmo→Metaline→Pend Oreille Village→Erie→Jersey→Nelway→

Or put two places side by side: Metaline Falls vs Salmo

Best time to visitMetaline Falls.

September

July

September

The whole year,without the guesswork.

Metaline Falls runs +1.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Metaline Falls.

The whole year,
without the guesswork.

Metaline Falls runs +1.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.