United States · 1991–2020

Best time to visit
Swaledale.

August leads for comfortable weather in Swaledale: typically 26.9°C by day, 14.3°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.9°C

Typical low14.3°C

Rain in August95 mm

Comfort

August

August · September · June

77climate match

Beach

July

July · August · June

65climate match

Outdoors

September

September · May · October

74climate match

The weakest month is January, scoring 5 against August’s 77 — days reach only -4.2°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

5-4.2° / -13.6°

Feb

5-1.7° / -11.3°

Mar

55.7° / -4.5°

Apr

2814.3° / 1.5°

May

5821° / 8.3°

Jun

6926.6° / 14.2°

Jul

6928.2° / 16°

Aug

7726.9° / 14.3°

Sep

7723.5° / 9.5°

Oct

4315.6° / 2.7°

Nov

56.5° / -4.1°

Dec

5-1.1° / -10.1°

Monthly climate evidence for Swaledale — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.2°C	-13.6°C	23 mm	4.9	9 h 20	5	Strong coverage
February	-1.7°C	-11.3°C	31 mm	5.1	10 h 27	5	Strong coverage
March	5.7°C	-4.5°C	58 mm	7.2	11 h 47	5	Strong coverage
April	14.3°C	1.5°C	105 mm	9.4	13 h 20	28	Strong coverage
May	21°C	8.3°C	131 mm	11	14 h 37	58	Strong coverage
June	26.6°C	14.2°C	137 mm	10.1	15 h 20	69	Strong coverage
July	28.2°C	16°C	113 mm	7.8	15 h 03	69	Strong coverage
August	26.9°C	14.3°C	95 mm	7.3	13 h 56	77	Strong coverage
September	23.5°C	9.5°C	88 mm	7.3	12 h 26	77	Strong coverage
October	15.6°C	2.7°C	64 mm	6.5	10 h 58	43	Strong coverage
November	6.5°C	-4.1°C	42 mm	5.4	9 h 40	5	Strong coverage
December	-1.1°C	-10.1°C	32 mm	5.7	9 h 01	5	Strong coverage

What has changed

Swaledale runs +1.0°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

+1.8

Feb

+0.4

Mar

+2.2

Apr

-0.1

May

0.0

Jun

+0.9

Jul

-0.1

Aug

+0.1

Sep

+2.3

Oct

+0.4

Nov

+1.1

Dec

+3.0

August daytime highs, 2011–2025. Last recorded: 26.2°C.

Records at MASON CITY MUNI AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.7°C26 Jan 2002	-35.0°C16 Jan 2009	28 mm22 Jan 1982	62 mm1982 · driest 0 mm in 2025	79
February	22.8°C26 Feb 2024	-35.6°C2 Feb 1996	41 mm27 Feb 1948	90 mm1971 · driest 1 mm in 1964	79
March	28.9°C29 Mar 1986	-33.3°C1 Mar 1962	53 mm30 Mar 2006	123 mm1990 · driest 4 mm in 1994	79
April	33.9°C18 Apr 1985	-14.4°C6 Apr 1982	70 mm19 Apr 2005	210 mm2013 · driest 15 mm in 2021	79
May	37.2°C14 May 2013	-5.6°C3 May 2005	117 mm21 May 2004	328 mm2004 · driest 21 mm in 1989	79
June	39.4°C8 Jun 1985	2.2°C1 Jun 1993	136 mm18 Jun 1954	365 mm1954 · driest 11 mm in 1980	79
July	40.0°C7 Jul 1980	5.6°C5 Jul 1967	105 mm24 Jul 2015	310 mm1990 · driest 8 mm in 2012	79
August	38.3°C23 Aug 2023	1.7°C20 Aug 1950	161 mm22 Aug 1954	400 mm1980 · driest 15 mm in 2012	78
September	37.2°C9 Sep 2013	-4.4°C29 Sep 1949	132 mm12 Sep 1978	366 mm1965 · driest 4 mm in 1952	78
October	35.0°C3 Oct 1997	-11.1°C28 Oct 1967	70 mm11 Oct 1986	171 mm2009 · driest 0 mm in 1952	78
November	26.1°C8 Nov 2006	-26.7°C26 Nov 1977	60 mm9 Nov 1975	110 mm1996 · driest 0 mm in 1976	78
December	20.6°C15 Dec 2021	-32.2°C18 Dec 1983	41 mm27 Dec 1982	100 mm1982 · driest 5 mm in 1958	78

Typical days per month at MASON CITY MUNI AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	8
February	0	0	27	<1	6
March	<1	0	25	2	4
April	2	<1	12	4	2
May	9	2	1	4	<1
June	20	7	0	5	0
July	26	10	0	4	0
August	23	6	0	3	0
September	13	3	<1	2	0
October	3	<1	11	2	<1
November	<1	0	23	2	3
December	0	0	30	<1	7

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 79); on 2011–2025 it is September (83). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MASON CITY 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%	15%	2%	9%	-8.9–-1.0°C
February	0%	15%	2%	10%	-5.7–2.9°C
March	3%	22%	6%	22%	0.3–9.7°C
April	18%	28%	10%	35%	10.1–17.3°C
May	44%	31%	12%	38%	18.8–23.8°C
June	66%	31%	14%	38%	24.7–28.4°C
July	74%	26%	11%	26%	26.4–30.4°C
August	75%	23%	11%	24%	25.1–29.2°C
September	58%	23%	8%	24%	20.8–25.6°C
October	25%	18%	6%	15%	12.8–18.8°C
November	3%	17%	4%	14%	2.4–9.3°C
December	0%	16%	3%	12%	-5.4–2.2°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.

1948Each stripe is one year’s mean temperature against the 78-year average. Warmest: 2012. Coolest: 1951.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4878067
NOAA station: USW00014940 · MASON CITY MUNI AP
Station distance: 19.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 42.98°, 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 MUNI AP is what differs

Clear Lake→Ventura→Thornton→Fertile→Hanlontown→Burchinal→

Or put two places side by side: Swaledale vs Clear Lake

Best time to visitSwaledale.