United States · 1991–2020

Best time to visit
Rockwell.

August leads for comfortable weather in Rockwell: typically 26.5°C by day, 14.7°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.5°C

Typical low14.7°C

Rain in August94 mm

Comfort

August

August · September · June

79climate match

Beach

July

July · August · June

63climate match

Outdoors

September

September · May · October

78climate match

The weakest month is January, scoring 5 against August’s 79 — days reach only -4.4°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

5-4.4° / -14.1°

Feb

5-1.9° / -11.9°

Mar

55.2° / -5.2°

Apr

2713.6° / 1.3°

May

5420.3° / 8.1°

Jun

7026° / 14°

Jul

7027.7° / 16.2°

Aug

7926.5° / 14.7°

Sep

7723° / 9.9°

Oct

4315.6° / 2.9°

Nov

56.3° / -3.9°

Dec

5-1.2° / -10.1°

Monthly climate evidence for Rockwell — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.4°C	-14.1°C	22 mm	4.8	9 h 20	5	Strong coverage
February	-1.9°C	-11.9°C	27 mm	4.5	10 h 27	5	Strong coverage
March	5.2°C	-5.2°C	50 mm	6.3	11 h 47	5	Strong coverage
April	13.6°C	1.3°C	99 mm	8.6	13 h 20	27	Strong coverage
May	20.3°C	8.1°C	142 mm	10.6	14 h 37	54	Strong coverage
June	26°C	14°C	144 mm	9.9	15 h 20	70	Strong coverage
July	27.7°C	16.2°C	118 mm	7.9	15 h 03	70	Strong coverage
August	26.5°C	14.7°C	94 mm	7.5	13 h 56	79	Strong coverage
September	23°C	9.9°C	82 mm	6.8	12 h 26	77	Strong coverage
October	15.6°C	2.9°C	65 mm	6.4	10 h 58	43	Strong coverage
November	6.3°C	-3.9°C	43 mm	4.6	9 h 40	5	Strong coverage
December	-1.2°C	-10.1°C	32 mm	5.2	9 h 01	5	Strong coverage

What has changed

Rockwell runs +0.1°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

+0.7

Feb

-0.8

Mar

+1.1

Apr

-1.3

May

-1.3

Jun

-0.2

Jul

-0.7

Aug

-0.6

Sep

+1.2

Oct

-0.1

Nov

+0.7

Dec

+2.4

August daytime highs, 2011–2025. Last recorded: 26.3°C.

Records at MASON CITY, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.7°C31 Jan 2025	-36.7°C31 Jan 1899	46 mm4 Jan 1922	117 mm1897 · driest 0 mm in 2025	127
February	23.3°C27 Feb 2024	-42.8°C2 Feb 1996	39 mm25 Feb 2007	109 mm1915 · driest 0 mm in 1995	128
March	28.9°C30 Mar 1986	-35.6°C1 Mar 1962	61 mm31 Mar 2006	139 mm1990 · driest 1 mm in 1994	127
April	35.0°C22 Apr 1980	-15.0°C6 Apr 1982	76 mm28 Apr 1975	204 mm1999 · driest 8 mm in 1910	128
May	40.0°C31 May 1934	-5.0°C2 May 1967	124 mm22 May 2004	336 mm2004 · driest 22 mm in 1934	130
June	40.0°C27 Jun 1934	-0.6°C2 Jun 1928	178 mm1 Jun 1900	342 mm1954 · driest 8 mm in 1922	130
July	41.7°C14 Jul 1936	3.3°C30 Jul 1899	108 mm3 Jul 1907	307 mm1999 · driest 4 mm in 1937	130
August	39.4°C3 Aug 1930	-1.1°C30 Aug 1915	159 mm10 Aug 1980	400 mm1980 · driest 23 mm in 1941	128
September	39.4°C6 Sep 1922	-9.4°C30 Sep 1899	132 mm8 Sep 1964	345 mm1965 · driest 1 mm in 1897	129
October	34.4°C5 Oct 1963	-20.0°C29 Oct 1925	60 mm7 Oct 2017	178 mm2019 · driest 0 mm in 1952	129
November	26.1°C9 Nov 2006	-25.6°C28 Nov 1897	69 mm1 Nov 1991	171 mm1909 · driest 0 mm in 1903	126
December	20.0°C16 Dec 2021	-32.2°C19 Dec 1983	38 mm28 Dec 1982	107 mm2015 · driest 0 mm in 1898	128

Typical days per month at MASON CITY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	5
February	0	0	27	<1	4
March	<1	0	25	2	3
April	2	<1	13	4	<1
May	7	2	1	5	<1
June	19	6	0	5	0
July	25	9	0	4	0
August	22	5	0	3	0
September	13	3	<1	2	0
October	3	<1	10	2	<1
November	<1	0	23	1	2
December	0	0	30	1	5

How often, not how much — every day in MASON 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%	14%	2%	7%	-8.1–-0.1°C
February	0%	14%	2%	8%	-6.0–2.7°C
March	4%	19%	5%	18%	0.9–9.9°C
April	18%	26%	9%	31%	10.6–17.7°C
May	44%	30%	13%	37%	18.4–24.3°C
June	65%	31%	14%	37%	23.9–28.8°C
July	75%	24%	10%	24%	26.6–31.2°C
August	75%	24%	10%	23%	25.6–29.3°C
September	59%	23%	9%	24%	20.9–25.7°C
October	28%	19%	7%	16%	13.7–19.1°C
November	3%	16%	4%	11%	2.9–9.6°C
December	0%	15%	3%	9%	-5.3–2.4°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.

1898Each stripe is one year’s mean temperature against the 115-year average. Warmest: 1987. Coolest: 1996.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4873424
NOAA station: USC00135230 · MASON CITY
Station distance: 19.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 42.99°, 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 MASON CITY is what differs

Mason City→Nora Springs→Manly→Plymouth→Rock Falls→Portland→

Or put two places side by side: Rockwell vs Mason City

Best time to visitRockwell.