United States · 1991–2020

Best time to visit
Downing.

May leads for comfortable weather in Downing: typically 23.3°C by day, 7.5°C at night, with 23 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.3°C

Typical low7.5°C

Rain in May23 mm

Comfort

May

May · June · September

83climate match

Beach

July

July · August · June

71climate match

Outdoors

May

May · April · October

84climate match

The weakest month is January, scoring 5 against May’s 83 — days reach only 1.4°C, 23° 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

51.4° / -5.1°

Feb

55.4° / -3.8°

Mar

3312.5° / -0.3°

Apr

5918.1° / 3.1°

May

8323.3° / 7.5°

Jun

8227.2° / 11.2°

Jul

7032.9° / 14.8°

Aug

7032.5° / 14.2°

Sep

8126.7° / 9.6°

Oct

5617.1° / 3.5°

Nov

147.5° / -1.5°

Dec

51.5° / -5.2°

Monthly climate evidence for Downing — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.4°C	-5.1°C	39 mm	6.9	8 h 46	5	Strong coverage
February	5.4°C	-3.8°C	24 mm	4.6	10 h 08	5	Strong coverage
March	12.5°C	-0.3°C	26 mm	4.5	11 h 44	33	Strong coverage
April	18.1°C	3.1°C	16 mm	3.2	13 h 34	59	Strong coverage
May	23.3°C	7.5°C	23 mm	4.1	15 h 09	83	Strong coverage
June	27.2°C	11.2°C	21 mm	3.6	16 h 01	82	Strong coverage
July	32.9°C	14.8°C	12 mm	2	15 h 40	70	Strong coverage
August	32.5°C	14.2°C	6 mm	1.3	14 h 18	70	Strong coverage
September	26.7°C	9.6°C	8 mm	1.8	12 h 31	81	Strong coverage
October	17.1°C	3.5°C	21 mm	4	10 h 44	56	Strong coverage
November	7.5°C	-1.5°C	30 mm	5.4	9 h 10	14	Strong coverage
December	1.5°C	-5.2°C	49 mm	8.8	8 h 23	5	Strong coverage

What has changed

Downing runs +0.6°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

+0.8

Feb

+0.1

Mar

+0.3

Apr

+0.2

May

+0.6

Jun

-0.1

Jul

+1.8

Aug

+1.8

Sep

+0.8

Oct

-0.8

Nov

+0.5

Dec

+0.7

May daytime highs, 2011–2020. Last recorded: 22.8°C.

Records at CHIEF JOSEPH DAM, 1949–2020
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C31 Jan 1989	-28.3°C30 Jan 1950	25 mm15 Jan 1968	108 mm1995 · driest 0 mm in 1953	70
February	17.8°C22 Feb 2002	-28.3°C1 Feb 1950	25 mm3 Feb 1961	107 mm1961 · driest 0 mm in 2005	70
March	25.6°C30 Mar 2003	-18.3°C4 Mar 2019	41 mm14 Mar 2008	76 mm2016 · driest 0 mm in 1954	69
April	33.9°C25 Apr 1977	-8.9°C14 Apr 2013	20 mm14 Apr 1957	59 mm2017 · driest 0 mm in 1951	71
May	39.4°C31 May 1986	-8.3°C1 May 2013	31 mm11 May 1967	67 mm2011 · driest 0 mm in 1992	71
June	45.0°C28 Jun 2015	-2.2°C17 Jun 2010	32 mm21 Jun 1984	62 mm1984 · driest 0 mm in 1960	69
July	43.3°C21 Jul 1994	-0.6°C9 Jul 2011	44 mm23 Jul 1992	78 mm1993 · driest 0 mm in 1959	70
August	43.3°C4 Aug 1998	1.7°C17 Aug 1973	27 mm23 Aug 1965	57 mm1976 · driest 0 mm in 2006	70
September	39.4°C2 Sep 1998	-1.7°C23 Sep 2000	28 mm20 Sep 2019	68 mm1986 · driest 0 mm in 1990	71
October	32.8°C6 Oct 2014	-12.2°C31 Oct 2002	27 mm14 Oct 2016	97 mm2016 · driest 0 mm in 1952	72
November	23.9°C1 Nov 1967	-22.8°C23 Nov 1985	30 mm11 Nov 1983	141 mm1983 · driest 1 mm in 1976	71
December	15.0°C4 Dec 2007	-28.3°C29 Dec 1968	38 mm20 Dec 2016	132 mm1996 · driest 1 mm in 2013	69

Typical days per month at CHIEF JOSEPH DAM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	1	4
February	0	0	23	<1	2
March	<1	0	17	<1	<1
April	2	<1	6	<1	<1
May	11	4	1	<1	0
June	20	8	0	<1	0
July	29	23	0	<1	0
August	29	22	0	<1	0
September	19	8	<1	<1	0
October	2	0	7	<1	0
November	0	0	18	<1	2
December	0	0	27	1	7

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 84); on 2011–2025 it is May (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in CHIEF JOSEPH 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%	21%	3%	21%	-1.8–3.8°C
February	0%	17%	2%	16%	1.9–7.8°C
March	4%	15%	2%	12%	8.7–14.4°C
April	31%	11%	1%	7%	15.5–20.3°C
May	68%	13%	2%	11%	20.3–25.3°C
June	85%	12%	2%	6%	24.1–29.7°C
July	94%	6%	<1%	3%	29.4–34.9°C
August	94%	6%	<1%	3%	28.9–34.4°C
September	86%	7%	<1%	5%	23.4–29.0°C
October	28%	11%	1%	10%	15.4–19.4°C
November	<1%	20%	2%	22%	5.1–9.7°C
December	0%	25%	3%	30%	-1.4–4.0°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.

1950Each stripe is one year’s mean temperature against the 60-year average. Warmest: 1998. Coolest: 1955.2019

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5792712
NOAA station: USC00451400 · CHIEF JOSEPH DAM
Station distance: 6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 48.04°, 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 CHIEF JOSEPH DAM is what differs

Bridgeport→Brewster→Mansfield→Brandts Landing→Dyer→Fairview→

Or put two places side by side: Downing vs Bridgeport

Best time to visitDowning.

May

July

May

The whole year,without the guesswork.

Downing runs +0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Downing.

The whole year,
without the guesswork.

Downing runs +0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.