United States · 1991–2020

Best time to visit
Iron Mountain.

August leads for comfortable weather in Iron Mountain: typically 25.5°C by day, 11.6°C at night, with 60 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25.5°C

Typical low11.6°C

Rain in August60 mm

Comfort

August

August · June · July

82climate match

Beach

July

July · August · June

61climate match

Outdoors

September

September · May · June

82climate match

The weakest month is January, scoring 5 against August’s 82 — days reach only -4.5°C, 28° 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

5-4.5° / -14°

Feb

5-2.4° / -13.8°

Mar

53.7° / -8.3°

Apr

2411.5° / -2.3°

May

5719.1° / 4.3°

Jun

8024.3° / 9.9°

Jul

7727.1° / 12.6°

Aug

8225.5° / 11.6°

Sep

6921.2° / 7.7°

Oct

3212.6° / 1.2°

Nov

54.9° / -4.2°

Dec

5-2° / -10.6°

Monthly climate evidence for Iron Mountain — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.5°C	-14°C	10 mm	2.8	9 h 02	5	Good coverage
February	-2.4°C	-13.8°C	13 mm	2.7	10 h 17	5	Good coverage
March	3.7°C	-8.3°C	20 mm	3.9	11 h 46	5	Good coverage
April	11.5°C	-2.3°C	40 mm	5.9	13 h 28	24	Good coverage
May	19.1°C	4.3°C	59 mm	7.7	14 h 54	57	Good coverage
June	24.3°C	9.9°C	69 mm	8.2	15 h 42	80	Good coverage
July	27.1°C	12.6°C	66 mm	7	15 h 23	77	Good coverage
August	25.5°C	11.6°C	60 mm	7.1	14 h 08	82	Good coverage
September	21.2°C	7.7°C	66 mm	7.4	12 h 29	69	Good coverage
October	12.6°C	1.2°C	55 mm	6.3	10 h 50	32	Good coverage
November	4.9°C	-4.2°C	24 mm	4.2	9 h 24	5	Good coverage
December	-2°C	-10.6°C	16 mm	3.7	8 h 41	5	Good coverage

Records at IRON MTN FORD AP, 1996–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	10.6°C8 Jan 2003	-32.7°C9 Jan 2014	19 mm2 Jan 2000	31 mm1999 · driest 0 mm in 2024	30
February	18.3°C27 Feb 2024	-32.7°C28 Feb 2014	26 mm11 Feb 1999	41 mm1999 · driest 0 mm in 2026	30
March	27.8°C21 Mar 2012	-31.1°C3 Mar 2003	25 mm16 Mar 2016	55 mm2002 · driest 3 mm in 1999	30
April	30.0°C13 Apr 2023	-20.6°C6 Apr 2003	56 mm12 Apr 2026	137 mm2026 · driest 8 mm in 2010	30
May	33.9°C24 May 2010	-7.8°C3 May 2004	52 mm23 May 2004	166 mm1999 · driest 11 mm in 2025	30
June	36.7°C20 Jun 2022	-2.8°C5 Jun 1998	58 mm25 Jun 2024	192 mm2010 · driest 13 mm in 2023	30
July	37.8°C13 Jul 2026	2.2°C1 Jul 2007	74 mm14 Jul 1999	239 mm1999 · driest 11 mm in 2015	30
August	36.1°C8 Aug 2001	0.6°C31 Aug 2009	66 mm14 Aug 2018	119 mm2006 · driest 8 mm in 2012	29
September	36.1°C11 Sep 1998	-3.3°C28 Sep 2000	84 mm23 Sep 2010	190 mm2010 · driest 5 mm in 2024	28
October	30.0°C7 Oct 2007	-10.5°C27 Oct 2020	64 mm5 Oct 2005	120 mm2018 · driest 8 mm in 2008	29
November	25.0°C6 Nov 2020	-22.1°C27 Nov 2014	25 mm23 Nov 1999	54 mm2001 · driest 0 mm in 2025	30
December	16.7°C3 Dec 1998	-33.3°C25 Dec 2004	21 mm14 Dec 2015	51 mm2006 · driest 3 mm in 2020	30

Typical days per month at IRON MTN FORD AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	30	<1
February	0	0	28	<1
March	<1	0	28	<1
April	<1	0	22	1
May	6	2	7	2
June	15	4	<1	2
July	23	8	0	2
August	19	4	0	2
September	8	1	2	2
October	1	0	14	2
November	0	0	25	<1
December	0	0	30	<1

How often, not how much — every day in IRON MTN FORD 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%	8%	<1%	4%	-6.9–-1.5°C
February	0%	9%	<1%	4%	-5.6–1.1°C
March	1%	13%	1%	9%	0.7–7.2°C
April	11%	21%	5%	19%	8.4–14.8°C
May	39%	24%	5%	23%	17.0–22.0°C
June	64%	27%	8%	30%	22.9–26.6°C
July	76%	22%	6%	22%	24.8–29.0°C
August	74%	23%	5%	19%	23.9–27.0°C
September	51%	23%	7%	24%	19.4–23.6°C
October	14%	19%	5%	13%	9.1–16.0°C
November	2%	13%	2%	9%	1.5–8.8°C
December	0%	12%	1%	5%	-4.8–0.7°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.

1998Each stripe is one year’s mean temperature against the 28-year average. Warmest: 2024. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4997232
NOAA station: USW00094893 · IRON MTN FORD AP
Station distance: 3.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 45.82°, 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 IRON MTN FORD AP is what differs

Antoine→Felch Mountain→Felch→Granite Bluff→Merriman→Metropolitan→

Or put two places side by side: Iron Mountain vs Antoine

Best time to visitIron Mountain.