United States · 1991–2020

Best time to visit
Heppner.

June leads for comfortable weather in Heppner: typically 24.9°C by day, 9.6°C at night, with 36 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.9°C

Typical low9.6°C

Rain in June36 mm

Comfort

June

June · September · July

85climate match

Beach

July

July · August · September

73climate match

Outdoors

May

May · September · June

85climate match

The weakest month is December, scoring 5 against June’s 85 — days reach only 5.9°C, 18° 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

76.4° / -2.5°

Feb

158.4° / -1.8°

Mar

3212.7° / 0.8°

Apr

4716° / 3°

May

7020.8° / 6.8°

Jun

8524.9° / 9.6°

Jul

7530.3° / 12.6°

Aug

7530.1° / 12.5°

Sep

8525.1° / 8.9°

Oct

5717.7° / 4.1°

Nov

2510.6° / 0.1°

Dec

55.9° / -2.7°

Monthly climate evidence for Heppner — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.4°C	-2.5°C	32 mm	7.5	9 h 05	7	Strong coverage
February	8.4°C	-1.8°C	28 mm	6.4	10 h 19	15	Strong coverage
March	12.7°C	0.8°C	34 mm	8.1	11 h 46	32	Strong coverage
April	16°C	3°C	38 mm	7.8	13 h 26	47	Strong coverage
May	20.8°C	6.8°C	44 mm	7.3	14 h 51	70	Strong coverage
June	24.9°C	9.6°C	36 mm	5.6	15 h 38	85	Strong coverage
July	30.3°C	12.6°C	8 mm	1.7	15 h 20	75	Strong coverage
August	30.1°C	12.5°C	7 mm	1.4	14 h 06	75	Strong coverage
September	25.1°C	8.9°C	11 mm	2.4	12 h 28	85	Strong coverage
October	17.7°C	4.1°C	30 mm	6	10 h 52	57	Strong coverage
November	10.6°C	0.1°C	35 mm	7.9	9 h 27	25	Strong coverage
December	5.9°C	-2.7°C	33 mm	8.2	8 h 44	5	Strong coverage

What has changed

Heppner runs +0.2°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

+0.8

Feb

-1.3

Mar

+0.1

Apr

-0.1

May

+0.1

Jun

-0.2

Jul

+1.0

Aug

+1.0

Sep

+0.8

Oct

-0.2

Nov

+0.4

Dec

+0.5

June daytime highs, 2011–2025. Last recorded: 26.5°C.

Records at HEPPNER, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C1 Jan 1918	-28.3°C12 Jan 1909	38 mm27 Jan 2024	103 mm1970 · driest 5 mm in 2013	127
February	23.9°C21 Feb 1995	-27.8°C9 Feb 1933	23 mm9 Feb 1942	81 mm2019 · driest 1 mm in 2013	126
March	27.2°C27 Mar 2025	-16.1°C17 Mar 1906	26 mm4 Mar 1983	104 mm1957 · driest 3 mm in 2004	127
April	33.3°C25 Apr 1910	-9.4°C19 Apr 1987	49 mm22 Apr 1988	118 mm1988 · driest 2 mm in 1977	127
May	37.8°C30 May 1903	-3.9°C1 May 1954	51 mm15 May 2011	88 mm1994 · driest 1 mm in 1964	127
June	42.8°C30 Jun 2021	-0.6°C8 Jun 2002	43 mm4 Jun 1997	88 mm2010 · driest 0 mm in 2015	126
July	42.2°C25 Jul 1928	0.0°C16 Jul 1986	48 mm13 Jul 1908	75 mm1904 · driest 0 mm in 1931	127
August	43.3°C10 Aug 1898	1.7°C30 Aug 1907	34 mm19 Aug 1918	74 mm1978 · driest 0 mm in 1939	128
September	37.2°C7 Sep 1955	-7.2°C24 Sep 1926	35 mm4 Sep 1899	65 mm1927 · driest 0 mm in 2012	126
October	33.3°C5 Oct 1980	-12.2°C31 Oct 1935	70 mm15 Oct 1905	93 mm1950 · driest 0 mm in 1917	127
November	26.7°C3 Nov 1908	-22.8°C23 Nov 1985	43 mm19 Nov 1996	100 mm1973 · driest 0 mm in 1939	127
December	23.9°C5 Dec 1939	-27.8°C12 Dec 1919	31 mm19 Dec 1895	112 mm1964 · driest 6 mm in 2011	128

Typical days per month at HEPPNER, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	22	<1	2
February	0	0	19	<1	2
March	<1	0	14	<1	<1
April	1	0	6	<1	<1
May	7	2	<1	1	0
June	15	5	0	1	0
July	27	18	0	<1	0
August	28	17	0	<1	0
September	16	6	<1	<1	0
October	3	<1	5	<1	<1
November	<1	0	15	<1	<1
December	0	0	23	<1	2

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

How often, not how much — every day in HEPPNER’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	<1%	25%	2%	28%	0.8–8.9°C
February	<1%	24%	2%	26%	4.7–11.3°C
March	5%	24%	2%	26%	9.9–14.7°C
April	19%	23%	3%	25%	13.4–18.6°C
May	46%	21%	3%	22%	17.9–22.9°C
June	73%	17%	3%	14%	22.3–27.4°C
July	94%	6%	<1%	2%	27.2–32.2°C
August	92%	7%	<1%	5%	26.8–31.4°C
September	75%	11%	2%	10%	21.6–26.6°C
October	33%	18%	2%	18%	15.6–20.6°C
November	3%	27%	3%	33%	8.1–13.3°C
December	<1%	26%	2%	29%	3.3–8.6°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.

1898Each stripe is one year’s mean temperature against the 114-year average. Warmest: 1934. Coolest: 1916.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5731035
NOAA station: USC00353827 · HEPPNER
Station distance: 1.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 45.35°, 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 HEPPNER is what differs

Ione→Lexington→Eightmile→Galloway (historical)→Lena→Pine City→

Or put two places side by side: Heppner vs Ione

Best time to visitHeppner.

June

July

May

The whole year,without the guesswork.

Heppner runs +0.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Heppner.

The whole year,
without the guesswork.

Heppner runs +0.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.