United States · 1991–2020

Best time to visit
Fort Defiance.

September leads for comfortable weather in Fort Defiance: typically 25.7°C by day, 5.8°C at night, with 33 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.7°C

Typical low5.8°C

Rain in September33 mm

Comfort

September

September · May · August

77climate match

Beach

August

August · July · June

66climate match

Outdoors

October

October · May · April

79climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only 7.2°C, 17° below the 24°C the score treats as ideal, and nights drop to -10°C.

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

57.2° / -10°

Feb

99.1° / -7.6°

Mar

2913.7° / -5°

Apr

5018° / -1.8°

May

7322.9° / 2.2°

Jun

6729.5° / 7°

Jul

6730.7° / 12.1°

Aug

7228.9° / 10.9°

Sep

7725.7° / 5.8°

Oct

5619.4° / -0.6°

Nov

2613.4° / -6.4°

Dec

57.2° / -10.3°

Monthly climate evidence for Fort Defiance — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	7.2°C	-10°C	24 mm	4.7	9 h 59	5	Good coverage
February	9.1°C	-7.6°C	19 mm	4.1	10 h 50	9	Good coverage
March	13.7°C	-5°C	15 mm	3.5	11 h 51	29	Good coverage
April	18°C	-1.8°C	11 mm	3.1	13 h 03	50	Good coverage
May	22.9°C	2.2°C	13 mm	2.5	14 h 02	73	Good coverage
June	29.5°C	7°C	8 mm	1.5	14 h 34	67	Good coverage
July	30.7°C	12.1°C	48 mm	7.2	14 h 21	67	Good coverage
August	28.9°C	10.9°C	46 mm	6.5	13 h 30	72	Good coverage
September	25.7°C	5.8°C	33 mm	4.5	12 h 22	77	Good coverage
October	19.4°C	-0.6°C	22 mm	4.1	11 h 13	56	Good coverage
November	13.4°C	-6.4°C	16 mm	3.1	10 h 14	26	Good coverage
December	7.2°C	-10.3°C	19 mm	4.2	9 h 45	5	Good coverage

Records at WINDOW ROCK AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.2°C31 Jan 2003	-31.6°C1 Jan 2011	43 mm21 Jan 2010	90 mm2010 · driest 0 mm in 2003	28
February	21.1°C17 Feb 2016	-30.5°C3 Feb 2011	22 mm22 Feb 2020	66 mm2005 · driest 0 mm in 2006	28
March	28.9°C21 Mar 2026	-22.2°C3 Mar 2002	17 mm15 Mar 2024	63 mm2024 · driest 1 mm in 2008	28
April	28.3°C29 Apr 2020	-13.8°C2 Apr 2025	15 mm24 Apr 2005	40 mm2004 · driest 0 mm in 2021	27
May	33.3°C31 May 2002	-10.5°C2 May 2008	18 mm20 May 2007	54 mm2007 · driest 0 mm in 2002	28
June	38.3°C16 Jun 2021	-3.2°C9 Jun 2020	28 mm27 Jun 2024	65 mm2024 · driest 0 mm in 2014	28
July	37.2°C17 Jul 2023	1.7°C2 Jul 2026	40 mm28 Jul 2026	98 mm2006 · driest 0 mm in 2023	28
August	36.1°C14 Aug 2020	1.7°C25 Aug 2002	82 mm16 Aug 2022	170 mm2022 · driest 2 mm in 2020	28
September	35.6°C6 Sep 2020	-5.6°C29 Sep 1999	38 mm22 Sep 2010	84 mm2002 · driest 4 mm in 2020	28
October	30.0°C1 Oct 2015	-17.1°C31 Oct 2019	24 mm9 Oct 2005	78 mm2000 · driest 0 mm in 1999	28
November	27.2°C28 Nov 2000	-20.6°C30 Nov 2004	22 mm30 Nov 2007	40 mm2019 · driest 0 mm in 1999	27
December	18.9°C1 Dec 2003	-27.1°C31 Dec 2010	26 mm22 Dec 2016	46 mm2016 · driest 0 mm in 2024	28

Typical days per month at WINDOW ROCK AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	29	<1
February	0	0	27	<1
March	0	0	28	<1
April	1	0	21	<1
May	12	2	9	<1
June	27	16	1	<1
July	30	20	0	2
August	28	12	0	<1
September	20	4	3	<1
October	3	0	19	<1
November	0	0	27	<1
December	0	0	30	<1

How often, not how much — every day in WINDOW ROCK AP’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%	15%	1%	13%	3.8–10.4°C
February	1%	14%	1%	13%	6.1–13.2°C
March	13%	13%	1%	10%	10.5–16.9°C
April	43%	9%	<1%	4%	16.6–20.2°C
May	77%	8%	<1%	4%	20.6–25.4°C
June	94%	6%	1%	3%	27.3–31.9°C
July	78%	22%	4%	27%	29.3–32.7°C
August	79%	21%	3%	21%	27.4–30.6°C
September	81%	15%	3%	11%	23.6–27.6°C
October	52%	13%	2%	11%	16.5–22.4°C
November	14%	10%	1%	6%	11.0–16.3°C
December	0%	13%	<1%	10%	5.4–10.3°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.

1999Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2017. Coolest: 2008.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5295093
NOAA station: USW00003029 · WINDOW ROCK AP
Station distance: 9.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 35.74°, 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 WINDOW ROCK AP is what differs

Window Rock→Navajo→Saint Michaels→Tohatchi→Sawmill→Nakaibito→

Or put two places side by side: Fort Defiance vs Window Rock

Best time to visitFort Defiance.