United States · 1991–2020

Best time to visit
Cass.

September leads for comfortable weather in Cass: typically 24°C by day, 9.7°C at night, with 85 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24°C

Typical low9.7°C

Rain in September85 mm

Comfort

September

September · August · June

80climate match

Beach

July

July · August · June

61climate match

Outdoors

September

September · October · May

74climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only -2.2°C, 26° 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

5-2.2° / -12.2°

Feb

50.8° / -9.5°

Mar

88° / -3.6°

Apr

3616.1° / 2.6°

May

6022° / 8.3°

Jun

6827° / 14°

Jul

6428.5° / 16.2°

Aug

7227.7° / 15.1°

Sep

8024° / 9.7°

Oct

4716.9° / 3.7°

Nov

118.2° / -2.5°

Dec

50.4° / -9.1°

Monthly climate evidence for Cass — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.2°C	-12.2°C	34 mm	5.1	9 h 25	5	Good coverage
February	0.8°C	-9.5°C	43 mm	4.6	10 h 30	5	Good coverage
March	8°C	-3.6°C	57 mm	5.5	11 h 48	8	Good coverage
April	16.1°C	2.6°C	107 mm	8.7	13 h 18	36	Good coverage
May	22°C	8.3°C	136 mm	10.4	14 h 33	60	Good coverage
June	27°C	14°C	136 mm	10.2	15 h 14	68	Good coverage
July	28.5°C	16.2°C	139 mm	8.6	14 h 58	64	Good coverage
August	27.7°C	15.1°C	114 mm	8.2	13 h 53	72	Good coverage
September	24°C	9.7°C	85 mm	7	12 h 26	80	Good coverage
October	16.9°C	3.7°C	76 mm	6.5	10 h 59	47	Good coverage
November	8.2°C	-2.5°C	59 mm	5.2	9 h 44	11	Good coverage
December	0.4°C	-9.1°C	43 mm	6.7	9 h 07	5	Good coverage

Records at ANAMOSA 1 WNW, 1937–2010
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C31 Jan 1989	-38.3°C17 Jan 2009	48 mm12 Jan 1960	118 mm1960 · driest 1 mm in 2003	73
February	19.4°C17 Feb 1981	-38.3°C3 Feb 1996	85 mm8 Feb 2001	125 mm2001 · driest 0 mm in 1995	70
March	30.6°C29 Mar 1986	-30.0°C1 Mar 1962	63 mm25 Mar 1945	161 mm1991 · driest 8 mm in 1981	72
April	32.2°C25 Apr 1986	-17.8°C6 Apr 1982	60 mm29 Apr 1974	206 mm2008 · driest 21 mm in 1942	72
May	33.9°C26 May 1985	-6.7°C2 May 2005	111 mm29 May 1962	276 mm2004 · driest 10 mm in 1992	73
June	37.8°C20 Jun 1988	0.6°C1 Jun 1993	99 mm17 Jun 1990	344 mm1969 · driest 17 mm in 1988	72
July	40.0°C25 Jul 1940	3.9°C5 Jul 1972	166 mm3 Jul 1999	371 mm1993 · driest 15 mm in 1991	73
August	39.4°C20 Aug 1947	2.8°C28 Aug 1986	126 mm5 Aug 1968	321 mm1987 · driest 4 mm in 2003	73
September	37.2°C9 Sep 1955	-5.6°C28 Sep 1942	136 mm8 Sep 1941	276 mm1941 · driest 10 mm in 1976	71
October	33.9°C4 Oct 1997	-12.2°C29 Oct 1952	67 mm19 Oct 1984	202 mm2009 · driest 0 mm in 1952	74
November	25.6°C1 Nov 2000	-25.6°C26 Nov 1977	81 mm17 Nov 1952	187 mm1992 · driest 2 mm in 2002	74
December	21.7°C4 Dec 1998	-32.8°C24 Dec 2000	56 mm15 Dec 1971	111 mm2003 · driest 6 mm in 1939	72

Typical days per month at ANAMOSA 1 WNW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	1	4
February	0	0	25	1	3
March	<1	0	24	2	1
April	3	<1	10	4	<1
May	10	2	2	4	0
June	22	8	0	5	0
July	27	11	0	4	0
August	25	8	0	4	0
September	14	4	<1	3	0
October	3	<1	9	2	<1
November	<1	0	21	2	<1
December	0	0	28	1	4

How often, not how much — every day in ANAMOSA 1 WNW’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%	3%	8%	-6.8–1.5°C
February	0%	15%	3%	10%	-2.5–4.2°C
March	5%	21%	7%	20%	3.5–11.3°C
April	21%	29%	10%	36%	13.0–19.2°C
May	49%	31%	11%	38%	19.8–24.8°C
June	65%	32%	15%	38%	25.2–29.0°C
July	74%	26%	12%	28%	27.5–30.9°C
August	75%	25%	11%	24%	26.2–30.1°C
September	64%	24%	10%	26%	21.7–26.1°C
October	32%	20%	7%	20%	15.3–20.7°C
November	3%	18%	6%	13%	4.9–10.8°C
December	0%	18%	4%	15%	-3.6–3.8°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.

1938Each stripe is one year’s mean temperature against the 65-year average. Warmest: 1998. Coolest: 2008.2010

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4850575
NOAA station: USC00130213 · ANAMOSA 1 WNW
Station distance: 10.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 42.19°, 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 ANAMOSA 1 WNW is what differs

Anamosa→Olin→Martelle→Stone City→Morley→Center Junction→

Or put two places side by side: Cass vs Anamosa

Best time to visitCass.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Cass.

The whole year,
without the guesswork.

Nearby, measured,
and named.