United States · 1991–2020

Best time to visit
Harris.

September leads for comfortable weather in Harris: typically 25.3°C by day, 12.4°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.3°C

Typical low12.4°C

Rain in September101 mm

Comfort

September

September · May · August

78climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · April · May

77climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 1.2°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

51.2° / -8.9°

Feb

54° / -6.9°

Mar

2311.1° / -1°

Apr

4517.4° / 4.7°

May

6722.5° / 10.7°

Jun

6327.8° / 16.7°

Jul

5630.1° / 18.9°

Aug

6529° / 17.5°

Sep

7825.3° / 12.4°

Oct

5718.6° / 6.1°

Nov

2410.6° / -0.6°

Dec

53.9° / -5.9°

Monthly climate evidence for Harris — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.2°C	-8.9°C	27 mm	4	9 h 35	5	Strong coverage
February	4°C	-6.9°C	35 mm	4.7	10 h 36	5	Strong coverage
March	11.1°C	-1°C	53 mm	6.1	11 h 49	23	Strong coverage
April	17.4°C	4.7°C	104 mm	8.5	13 h 13	45	Strong coverage
May	22.5°C	10.7°C	135 mm	10.1	14 h 23	67	Strong coverage
June	27.8°C	16.7°C	141 mm	9.8	15 h 02	63	Strong coverage
July	30.1°C	18.9°C	125 mm	7.6	14 h 47	56	Strong coverage
August	29°C	17.5°C	105 mm	7.5	13 h 46	65	Strong coverage
September	25.3°C	12.4°C	101 mm	7	12 h 24	78	Strong coverage
October	18.6°C	6.1°C	80 mm	6.4	11 h 04	57	Strong coverage
November	10.6°C	-0.6°C	50 mm	5.3	9 h 53	24	Strong coverage
December	3.9°C	-5.9°C	40 mm	4.6	9 h 19	5	Strong coverage

What has changed

Harris runs -0.3°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

-0.2

Feb

-0.7

Mar

+0.3

Apr

-1.5

May

-1.2

Jun

-0.2

Jul

-1.1

Aug

-1.2

Sep

+0.5

Oct

-0.2

Nov

-0.1

Dec

+1.7

September daytime highs, 2011–2025. Last recorded: 26.7°C.

Records at PRINCETON, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C31 Jan 1989	-32.2°C12 Jan 1974	64 mm12 Jan 1898	136 mm1898 · driest 0 mm in 1954	85
February	25.0°C23 Feb 2017	-33.3°C13 Feb 1905	89 mm13 Feb 2007	166 mm2007 · driest 0 mm in 2026	85
March	31.7°C27 Mar 2026	-31.7°C5 Mar 1960	88 mm4 Mar 1976	217 mm1973 · driest 4 mm in 1989	86
April	35.6°C29 Apr 1901	-13.3°C2 Apr 2018	83 mm16 Apr 1992	189 mm1992 · driest 9 mm in 2004	86
May	36.1°C26 May 1953	-2.2°C2 May 1961	104 mm17 May 2026	280 mm1995 · driest 15 mm in 2006	87
June	41.1°C25 Jun 1988	2.8°C3 Jun 1969	160 mm25 Jun 2021	300 mm2010 · driest 16 mm in 2002	86
July	43.9°C24 Jul 1901	5.6°C5 Jul 1972	138 mm11 Jul 1993	532 mm1993 · driest 1 mm in 2005	88
August	43.3°C29 Aug 1984	1.7°C28 Aug 1986	126 mm2 Aug 2023	279 mm1970 · driest 8 mm in 1958	85
September	38.9°C5 Sep 1899	-3.9°C29 Sep 1984	130 mm22 Sep 2010	329 mm2010 · driest 8 mm in 2023	86
October	35.0°C2 Oct 1953	-10.6°C29 Oct 1952	94 mm24 Oct 2021	269 mm2021 · driest 0 mm in 1895	86
November	28.9°C5 Nov 1893	-24.4°C30 Nov 1964	74 mm5 Nov 2022	156 mm2015 · driest 0 mm in 1989	86
December	22.8°C16 Dec 2021	-31.7°C23 Dec 1989	76 mm7 Dec 1980	107 mm1980 · driest 0 mm in 2002	83

Typical days per month at PRINCETON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	<1	2
February	0	0	23	<1	2
March	1	0	18	2	<1
April	4	<1	6	4	<1
May	10	2	<1	4	0
June	21	9	0	4	0
July	26	14	0	3	0
August	25	12	0	3	0
September	16	6	<1	3	0
October	5	<1	4	2	<1
November	<1	0	16	2	<1
December	0	0	26	2	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 82); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in PRINCETON’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%	13%	3%	5%	-2.4–5.2°C
February	1%	15%	3%	11%	-1.2–8.7°C
March	12%	21%	7%	19%	6.7–14.1°C
April	32%	28%	11%	32%	15.3–20.5°C
May	54%	31%	14%	38%	20.8–26.4°C
June	71%	29%	12%	33%	26.5–31.2°C
July	77%	23%	12%	21%	28.9–33.9°C
August	76%	23%	10%	25%	27.7–32.9°C
September	70%	23%	11%	23%	23.4–28.3°C
October	45%	20%	8%	20%	17.1–22.9°C
November	10%	16%	5%	11%	7.6–14.3°C
December	<1%	15%	4%	11%	0.4–7.2°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.

1893Each stripe is one year’s mean temperature against the 74-year average. Warmest: 2012. Coolest: 1978.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5055356
NOAA station: USC00236866 · PRINCETON
Station distance: 22.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 40.31°, 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 PRINCETON is what differs

Princeton→Mercer→Cainsville→Newtown→Ravanna→Adel→

Or put two places side by side: Harris vs Princeton

Best time to visitHarris.

September

August

October

The whole year,without the guesswork.

Harris runs -0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Harris.

The whole year,
without the guesswork.

Harris runs -0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.