United States · 1991–2020

Best time to visit
Lone Tree.

September leads for comfortable weather in Lone Tree: typically 25.8°C by day, 12.4°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.8°C

Typical low12.4°C

Rain in September88 mm

Comfort

September

September · May · August

79climate match

Beach

August

August · July · June

71climate match

Outdoors

October

October · April · September

77climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only -0.2°C, 24° 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

5-0.2° / -9.7°

Feb

52.7° / -7.3°

Mar

179.9° / -1.5°

Apr

4517.6° / 4.4°

May

7123.5° / 11°

Jun

6228.4° / 16.6°

Jul

5830.2° / 18.5°

Aug

6529.1° / 17.1°

Sep

7925.8° / 12.4°

Oct

5618.5° / 5.9°

Nov

199.8° / -1°

Dec

52.5° / -6.6°

Monthly climate evidence for Lone Tree — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.2°C	-9.7°C	29 mm	4.9	9 h 29	5	Strong coverage
February	2.7°C	-7.3°C	36 mm	5.2	10 h 32	5	Strong coverage
March	9.9°C	-1.5°C	58 mm	6.6	11 h 48	17	Strong coverage
April	17.6°C	4.4°C	98 mm	9.2	13 h 16	45	Strong coverage
May	23.5°C	11°C	128 mm	10.4	14 h 29	71	Strong coverage
June	28.4°C	16.6°C	139 mm	9.4	15 h 10	62	Strong coverage
July	30.2°C	18.5°C	116 mm	7.6	14 h 54	58	Strong coverage
August	29.1°C	17.1°C	110 mm	7.7	13 h 50	65	Strong coverage
September	25.8°C	12.4°C	88 mm	6.9	12 h 25	79	Strong coverage
October	18.5°C	5.9°C	76 mm	6.8	11 h 01	56	Strong coverage
November	9.8°C	-1°C	57 mm	6.1	9 h 47	19	Strong coverage
December	2.5°C	-6.6°C	41 mm	6	9 h 11	5	Strong coverage

What has changed

Lone Tree 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

+0.5

Mar

+1.0

Apr

-0.8

May

-0.6

Jun

-0.1

Jul

-1.0

Aug

-0.7

Sep

+1.0

Oct

-0.4

Nov

+0.1

Dec

+2.3

September daytime highs, 2011–2025. Last recorded: 27.6°C.

Records at IOWA CITY, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C31 Jan 1989	-35.6°C31 Jan 2019	53 mm12 Jan 1960	117 mm1898 · driest 1 mm in 1981	130
February	25.0°C28 Feb 2024	-35.6°C13 Feb 1905	49 mm17 Feb 1911	123 mm1911 · driest 2 mm in 1995	130
March	32.2°C22 Mar 2026	-27.2°C1 Mar 1962	70 mm8 Mar 2009	156 mm1991 · driest 5 mm in 1981	130
April	33.9°C22 Apr 1980	-12.2°C6 Apr 1982	105 mm24 Apr 1965	211 mm1965 · driest 15 mm in 1942	134
May	40.6°C31 May 1934	-4.4°C3 May 2005	134 mm10 May 1996	338 mm1996 · driest 13 mm in 1992	134
June	40.6°C28 Jun 1934	2.8°C4 Jun 1945	153 mm22 Jun 2007	277 mm2010 · driest 1 mm in 1963	134
July	42.8°C14 Jul 1936	4.4°C16 Jul 1906	176 mm14 Jul 1962	341 mm1993 · driest 4 mm in 1991	134
August	42.2°C18 Aug 1936	3.3°C30 Aug 1915	110 mm2 Aug 1921	313 mm1993 · driest 3 mm in 2013	133
September	38.3°C10 Sep 2013	-6.7°C30 Sep 1899	122 mm26 Sep 1930	268 mm1970 · driest 1 mm in 2024	133
October	34.4°C3 Oct 2006	-15.6°C30 Oct 1925	81 mm6 Oct 2018	209 mm1984 · driest 0 mm in 1952	133
November	27.2°C1 Nov 1933	-21.1°C26 Nov 1898	119 mm17 Nov 1952	205 mm1992 · driest 3 mm in 2007	128
December	23.3°C16 Dec 2021	-32.8°C28 Dec 1924	73 mm15 Dec 1971	114 mm1971 · driest 6 mm in 1976	129

Typical days per month at IOWA CITY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	4
February	0	0	25	1	3
March	<1	0	19	2	2
April	4	<1	6	3	<1
May	14	3	<1	4	0
June	24	11	0	5	0
July	29	16	0	4	0
August	28	13	0	3	0
September	18	7	<1	3	0
October	5	1	5	2	<1
November	<1	0	18	2	<1
December	0	0	27	1	4

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 82); on 2011–2025 it is September (80). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in IOWA CITY’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%	16%	3%	10%	-5.2–3.0°C
February	<1%	17%	3%	11%	-3.0–6.1°C
March	7%	22%	6%	23%	4.7–12.8°C
April	26%	29%	10%	36%	13.5–20.0°C
May	51%	32%	12%	42%	20.4–25.8°C
June	69%	30%	13%	34%	25.4–30.2°C
July	75%	25%	11%	25%	28.4–32.5°C
August	77%	23%	10%	23%	27.4–31.1°C
September	67%	24%	10%	25%	23.1–27.6°C
October	38%	21%	7%	21%	16.0–22.0°C
November	6%	19%	6%	17%	6.2–12.7°C
December	<1%	18%	4%	13%	-2.0–5.4°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.

1893Each stripe is one year’s mean temperature against the 126-year average. Warmest: 2012. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4865338
NOAA station: USC00134101 · IOWA CITY
Station distance: 15 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 41.49°, 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 IOWA CITY is what differs

West Liberty→Kalona→West Branch→Riverside→Hills→Bon-Aire Mobile Home Lodge→

Or put two places side by side: Lone Tree vs West Liberty

Best time to visitLone Tree.