United States · 1991–2020

Best time to visit
Petrel.

September leads for comfortable weather in Petrel: typically 24.6°C by day, 8.6°C at night, with 38 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.6°C

Typical low8.6°C

Rain in September38 mm

Comfort

September

September · June · August

85climate match

Beach

August

August · July · June

72climate match

Outdoors

September

September · May · October

81climate match

The weakest month is January, scoring 5 against September’s 85 — days reach only -2.1°C, 26° 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

5-2.1° / -12.8°

Feb

50° / -11°

Mar

56.9° / -5.8°

Apr

3613.9° / -0.1°

May

6220.3° / 6.2°

Jun

7825.6° / 11.6°

Jul

7130° / 14.8°

Aug

7429.7° / 13.8°

Sep

8524.6° / 8.6°

Oct

4415.1° / 1.6°

Nov

56.1° / -5.5°

Dec

5-0.4° / -10.8°

Monthly climate evidence for Petrel — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.1°C	-12.8°C	7 mm	2.3	9 h 01	5	Strong coverage
February	0°C	-11°C	11 mm	2.9	10 h 16	5	Strong coverage
March	6.9°C	-5.8°C	20 mm	4.2	11 h 45	5	Strong coverage
April	13.9°C	-0.1°C	42 mm	6.1	13 h 28	36	Strong coverage
May	20.3°C	6.2°C	72 mm	8.1	14 h 55	62	Strong coverage
June	25.6°C	11.6°C	78 mm	8.6	15 h 43	78	Strong coverage
July	30°C	14.8°C	72 mm	7.3	15 h 24	71	Strong coverage
August	29.7°C	13.8°C	53 mm	5.5	14 h 08	74	Strong coverage
September	24.6°C	8.6°C	38 mm	4.5	12 h 29	85	Strong coverage
October	15.1°C	1.6°C	40 mm	4.6	10 h 50	44	Strong coverage
November	6.1°C	-5.5°C	16 mm	3	9 h 23	5	Strong coverage
December	-0.4°C	-10.8°C	11 mm	2.8	8 h 40	5	Strong coverage

What has changed

Petrel runs +1.7°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

+2.9

Feb

0.0

Mar

+3.0

Apr

+0.6

May

+0.7

Jun

+1.7

Jul

+1.2

Aug

+1.0

Sep

+4.1

Oct

+0.4

Nov

+1.8

Dec

+2.8

September daytime highs, 2011–2025. Last recorded: 25.4°C.

Records at LEMMON, 1909–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C23 Jan 1981	-41.1°C17 Jan 1943	23 mm4 Jan 1997	44 mm1923 · driest 0 mm in 2006	114
February	21.1°C29 Feb 1992	-42.8°C16 Feb 1936	23 mm1 Feb 1939	53 mm1939 · driest 0 mm in 1921	114
March	29.4°C22 Mar 1910	-32.8°C1 Mar 1962	38 mm15 Mar 1920	80 mm1987 · driest 0 mm in 1909	115
April	33.9°C21 Apr 1980	-21.1°C3 Apr 1936	55 mm28 Apr 2025	127 mm1967 · driest 2 mm in 1926	114
May	39.4°C28 May 1934	-12.2°C3 May 1967	77 mm25 May 1972	233 mm2013 · driest 2 mm in 1934	112
June	42.8°C29 Jun 2002	-1.7°C5 Jun 1920	102 mm15 Jun 1922	267 mm1947 · driest 5 mm in 1949	114
July	46.1°C6 Jul 1936	2.8°C6 Jul 1934	100 mm13 Jul 2009	245 mm1993 · driest 3 mm in 1936	114
August	41.7°C27 Aug 1937	-0.6°C30 Aug 1935	128 mm12 Aug 1999	175 mm1999 · driest 3 mm in 1969	115
September	40.6°C5 Sep 1978	-10.0°C25 Sep 1926	67 mm8 Sep 2013	135 mm1977 · driest 2 mm in 1952	114
October	35.0°C1 Oct 1953	-23.3°C26 Oct 1919	76 mm13 Oct 2021	179 mm2013 · driest 0 mm in 1978	113
November	27.8°C7 Nov 1999	-31.1°C13 Nov 1940	51 mm1 Nov 2000	90 mm1922 · driest 0 mm in 1999	111
December	21.1°C1 Dec 1913	-36.1°C30 Dec 1990	30 mm17 Dec 1967	59 mm1972 · driest 0 mm in 2004	113

Typical days per month at LEMMON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	0	4
February	0	0	27	<1	4
March	<1	0	26	<1	3
April	2	<1	15	1	2
May	7	1	3	3	<1
June	18	6	0	2	0
July	27	16	0	2	0
August	26	16	0	2	0
September	15	6	1	1	0
October	3	<1	12	1	1
November	<1	0	25	<1	2
December	0	0	30	<1	4

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 82); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in LEMMON’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%	10%	<1%	6%	-10.0–2.5°C
February	<1%	11%	<1%	7%	-6.6–4.8°C
March	4%	14%	2%	9%	0.0–10.2°C
April	19%	21%	4%	20%	9.5–17.6°C
May	43%	25%	7%	29%	16.7–23.2°C
June	63%	29%	10%	35%	22.0–28.7°C
July	78%	21%	6%	17%	27.0–32.8°C
August	80%	18%	5%	13%	26.0–31.4°C
September	63%	16%	4%	11%	20.1–26.3°C
October	28%	13%	3%	9%	10.5–18.4°C
November	3%	10%	1%	7%	1.3–9.6°C
December	<1%	10%	<1%	4%	-6.8–3.1°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.

1909Each stripe is one year’s mean temperature against the 103-year average. Warmest: 2016. Coolest: 1950.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5691013
NOAA station: USC00394864 · LEMMON
Station distance: 9.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 45.95°, 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 LEMMON is what differs

Lemmon→North Lemmon→Keldron→Thunder Hawk→White Butte→

Or put two places side by side: Petrel vs Lemmon

Best time to visitPetrel.

September

August

September

The whole year,without the guesswork.

Petrel runs +1.7°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Petrel.

The whole year,
without the guesswork.

Petrel runs +1.7°C
on the 1961–1990 baseline.

Nearby, measured,
and named.