United States · 1991–2020

Best time to visit
Ames.

September leads for comfortable weather in Ames: typically 24.9°C by day, 10.8°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.9°C

Typical low10.8°C

Rain in September86 mm

Comfort

September

September · August · June

79climate match

Beach

July

July · August · June

72climate match

Outdoors

September

September · October · May

71climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only -1.5°C, 25° 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

5-1.5° / -11.3°

Feb

50.7° / -9.3°

Mar

138.4° / -2.6°

Apr

3916.3° / 3.4°

May

6422.2° / 9.8°

Jun

6727.5° / 15.5°

Jul

6529.2° / 17.4°

Aug

6927.7° / 15.6°

Sep

7924.9° / 10.8°

Oct

4817.1° / 4°

Nov

168.9° / -2.5°

Dec

51.1° / -8.7°

Monthly climate evidence for Ames — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-1.5°C	-11.3°C	14 mm	2.9	9 h 26	5	Good coverage
February	0.7°C	-9.3°C	18 mm	3.4	10 h 30	5	Good coverage
March	8.4°C	-2.6°C	47 mm	5.8	11 h 48	13	Good coverage
April	16.3°C	3.4°C	100 mm	9	13 h 17	39	Good coverage
May	22.2°C	9.8°C	138 mm	10.6	14 h 32	64	Good coverage
June	27.5°C	15.5°C	136 mm	9.9	15 h 13	67	Good coverage
July	29.2°C	17.4°C	102 mm	7.8	14 h 57	65	Good coverage
August	27.7°C	15.6°C	125 mm	8.3	13 h 52	69	Good coverage
September	24.9°C	10.8°C	86 mm	6.4	12 h 26	79	Good coverage
October	17.1°C	4°C	73 mm	7.4	11 h	48	Good coverage
November	8.9°C	-2.5°C	42 mm	4.4	9 h 45	16	Good coverage
December	1.1°C	-8.7°C	28 mm	3.6	9 h 08	5	Good coverage

Records at AMES MUNI AP, 1996–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C26 Jan 2002	-34.9°C16 Jan 2009	38 mm8 Jan 2026	60 mm2023 · driest 0 mm in 2012	30
February	25.6°C26 Feb 2024	-29.9°C5 Feb 2015	30 mm27 Feb 2023	67 mm2023 · driest 0 mm in 2012	30
March	33.3°C21 Mar 2026	-25.5°C3 Mar 2014	53 mm6 Mar 2026	105 mm2009 · driest 1 mm in 2003	30
April	31.7°C1 Apr 2003	-10.6°C4 Apr 2002	69 mm13 Apr 2014	222 mm2014 · driest 15 mm in 2000	30
May	36.7°C28 May 2018	-5.0°C4 May 2005	123 mm22 May 2004	296 mm2013 · driest 28 mm in 2006	30
June	38.3°C17 Jun 2021	4.4°C1 Jun 2001	108 mm14 Jun 2018	324 mm2018 · driest 35 mm in 2006	30
July	37.8°C23 Jul 2012	7.8°C7 Jul 1997	97 mm20 Jul 2026	342 mm2026 · driest 37 mm in 2013	30
August	37.2°C9 Aug 2005	5.6°C15 Aug 2004	107 mm9 Aug 2015	396 mm2010 · driest 20 mm in 2013	29
September	37.2°C9 Sep 2013	-2.8°C30 Sep 2003	83 mm22 Sep 2016	227 mm2016 · driest 3 mm in 1998	29
October	35.0°C3 Oct 1997	-12.2°C27 Oct 1997	81 mm24 Oct 2021	200 mm2009 · driest 12 mm in 2005	30
November	27.8°C8 Nov 1999	-21.6°C12 Nov 2019	75 mm3 Nov 2003	110 mm2003 · driest 0 mm in 2002	30
December	23.3°C15 Dec 2021	-28.8°C24 Dec 2013	59 mm13 Dec 2015	126 mm2015 · driest 0 mm in 2002	30

Typical days per month at AMES MUNI AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	30	<1
February	0	0	27	<1
March	<1	0	23	2
April	3	<1	8	3
May	11	3	<1	4
June	23	9	0	4
July	29	14	0	3
August	26	9	0	3
September	16	5	<1	3
October	4	<1	8	2
November	<1	0	21	1
December	0	0	29	<1

How often, not how much — every day in AMES MUNI 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%	9%	1%	5%	-4.3–0.9°C
February	<1%	11%	2%	8%	-4.7–6.6°C
March	9%	19%	6%	18%	4.8–13.5°C
April	26%	29%	11%	37%	13.8–18.9°C
May	50%	34%	14%	44%	20.4–24.9°C
June	67%	32%	14%	42%	26.2–29.4°C
July	74%	26%	11%	27%	27.5–30.6°C
August	73%	27%	11%	30%	26.3–29.4°C
September	72%	20%	9%	19%	22.8–27.5°C
October	32%	24%	8%	23%	14.5–20.0°C
November	8%	15%	5%	10%	4.4–12.4°C
December	<1%	12%	3%	6%	-3.1–4.6°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.

1997Each stripe is one year’s mean temperature against the 29-year average. Warmest: 2024. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4846834
NOAA station: USW00094989 · AMES MUNI AP
Station distance: 4.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 42.03°, 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 AMES MUNI AP is what differs

Story City→Roland→Gilbert→Kelley→Randall→Bloomington→

Or put two places side by side: Ames vs Story City

Best time to visitAmes.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Ames.

The whole year,
without the guesswork.

Nearby, measured,
and named.