United States · 1991–2020

Best time to visit
Rensselaer.

September leads for comfortable weather in Rensselaer: typically 25.5°C by day, 13.8°C at night, with 89 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low13.8°C

Rain in September89 mm

Comfort

September

September · May · June

82climate match

Beach

July

July · August · June

77climate match

Outdoors

October

October · April · September

78climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 1.4°C, 23° 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

51.4° / -7.8°

Feb

54.2° / -5.7°

Mar

2010.8° / 0°

Apr

4617.6° / 6°

May

7223° / 12.2°

Jun

6627.8° / 17.5°

Jul

5929.8° / 19.6°

Aug

6529.1° / 18.4°

Sep

8225.5° / 13.8°

Oct

5818.7° / 7.2°

Nov

2310.8° / 0.8°

Dec

54° / -4.8°

Monthly climate evidence for Rensselaer — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.4°C	-7.8°C	53 mm	6.3	9 h 39	5	Strong coverage
February	4.2°C	-5.7°C	57 mm	6.1	10 h 38	5	Strong coverage
March	10.8°C	0°C	71 mm	8.1	11 h 49	20	Strong coverage
April	17.6°C	6°C	111 mm	9.7	13 h 11	46	Strong coverage
May	23°C	12.2°C	127 mm	10.6	14 h 20	72	Strong coverage
June	27.8°C	17.5°C	120 mm	8.8	14 h 57	66	Strong coverage
July	29.8°C	19.6°C	106 mm	7.2	14 h 43	59	Strong coverage
August	29.1°C	18.4°C	100 mm	6.6	13 h 44	65	Strong coverage
September	25.5°C	13.8°C	89 mm	6.3	12 h 24	82	Strong coverage
October	18.7°C	7.2°C	86 mm	7.2	11 h 05	58	Strong coverage
November	10.8°C	0.8°C	70 mm	6.7	9 h 56	23	Strong coverage
December	4°C	-4.8°C	55 mm	6.4	9 h 23	5	Strong coverage

What has changed

Rensselaer runs +0.6°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

+0.6

Feb

+0.3

Mar

+1.0

Apr

-0.3

May

+0.1

Jun

+0.7

Jul

-0.2

Aug

+0.1

Sep

+1.5

Oct

+0.4

Nov

+0.1

Dec

+2.6

September daytime highs, 2011–2025. Last recorded: 28.7°C.

Records at HANNIBAL WTR WKS, 1933–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C24 Jan 1950	-29.4°C20 Jan 1985	73 mm31 Jan 2002	141 mm2005 · driest 3 mm in 1986	92
February	27.2°C29 Feb 1972	-28.3°C3 Feb 1996	111 mm21 Feb 1997	162 mm1997 · driest 4 mm in 1947	92
March	32.8°C27 Mar 2026	-22.8°C5 Mar 1960	69 mm18 Mar 2021	259 mm1973 · driest 8 mm in 1956	92
April	33.9°C26 Apr 1986	-9.4°C3 Apr 1936	87 mm30 Apr 2017	216 mm1981 · driest 22 mm in 2018	91
May	40.0°C31 May 1934	-1.1°C3 May 1976	92 mm15 May 1991	278 mm2013 · driest 19 mm in 2012	92
June	40.0°C19 Jun 1936	6.7°C14 Jun 1942	109 mm30 Jun 2020	340 mm2015 · driest 8 mm in 1991	92
July	45.6°C14 Jul 1954	8.9°C30 Jul 1971	150 mm20 Jul 1949	481 mm1981 · driest 1 mm in 1940	93
August	43.3°C9 Aug 1934	4.4°C31 Aug 1999	122 mm31 Aug 1981	289 mm1995 · driest 6 mm in 1947	93
September	38.9°C2 Sep 2011	-1.1°C28 Sep 1942	129 mm10 Sep 2014	279 mm1945 · driest 3 mm in 1956	93
October	35.0°C7 Oct 1939	-9.4°C31 Oct 1934	115 mm12 Oct 1969	256 mm1969 · driest 6 mm in 1950	93
November	28.3°C1 Nov 1938	-21.1°C30 Nov 1964	62 mm4 Nov 1938	292 mm1985 · driest 4 mm in 1933	93
December	24.4°C16 Dec 2021	-29.4°C23 Dec 1989	86 mm3 Dec 1982	220 mm1982 · driest 3 mm in 1955	93

Typical days per month at HANNIBAL WTR WKS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	2	3
February	0	0	23	2	2
March	1	0	16	2	1
April	5	<1	4	3	<1
May	12	3	0	4	0
June	24	11	0	4	0
July	29	16	0	3	0
August	27	13	0	3	0
September	17	6	0	3	0
October	6	1	2	3	0
November	<1	0	14	3	<1
December	0	0	24	2	2

How often, not how much — every day in HANNIBAL WTR WKS’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	<1%	19%	5%	15%	-2.3–5.0°C
February	2%	20%	5%	19%	-0.3–8.3°C
March	11%	26%	8%	29%	7.0–14.7°C
April	28%	31%	11%	40%	15.2–21.0°C
May	54%	30%	12%	37%	20.8–26.6°C
June	70%	28%	12%	32%	26.1–30.5°C
July	77%	23%	10%	23%	28.4–32.3°C
August	78%	21%	9%	19%	27.7–31.9°C
September	70%	22%	9%	22%	23.7–28.2°C
October	41%	22%	9%	24%	17.3–22.2°C
November	9%	21%	7%	20%	7.5–13.4°C
December	<1%	20%	6%	18%	0.9–7.5°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.

1934Each stripe is one year’s mean temperature against the 90-year average. Warmest: 2012. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4405432
NOAA station: USC00233601 · HANNIBAL WTR WKS
Station distance: 15.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 39.67°, 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 HANNIBAL WTR WKS is what differs

Hannibal→West Ely→Aladdin→East Hannibal→Fall Creek→Munger→

Or put two places side by side: Rensselaer vs Hannibal

Best time to visitRensselaer.

September

July

October

The whole year,without the guesswork.

Rensselaer runs +0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Rensselaer.

The whole year,
without the guesswork.

Rensselaer runs +0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.