United States · 1991–2020

Best time to visit
La Salle.

September leads for comfortable weather in La Salle: typically 25.2°C by day, 11.4°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.2°C

Typical low11.4°C

Rain in September83 mm

Comfort

September

September · June · August

80climate match

Beach

July

July · August · June

69climate match

Outdoors

October

October · May · September

72climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only -0.8°C, 25° 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

5-0.8° / -10°

Feb

51.7° / -8°

Mar

108.9° / -2.6°

Apr

4016.4° / 3.2°

May

6922.8° / 9.6°

Jun

7227.7° / 15.2°

Jul

6429.2° / 17.1°

Aug

7128.2° / 16°

Sep

8025.2° / 11.4°

Oct

5218° / 5.1°

Nov

149.4° / -1.1°

Dec

52.2° / -6.7°

Monthly climate evidence for La Salle — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.8°C	-10°C	47 mm	6.9	9 h 30	5	Good coverage
February	1.7°C	-8°C	42 mm	5.6	10 h 33	5	Good coverage
March	8.9°C	-2.6°C	62 mm	7.8	11 h 48	10	Good coverage
April	16.4°C	3.2°C	91 mm	9.9	13 h 15	40	Good coverage
May	22.8°C	9.6°C	110 mm	10.4	14 h 29	69	Good coverage
June	27.7°C	15.2°C	104 mm	9.2	15 h 09	72	Good coverage
July	29.2°C	17.1°C	113 mm	8.2	14 h 53	64	Good coverage
August	28.2°C	16°C	99 mm	7.9	13 h 50	71	Good coverage
September	25.2°C	11.4°C	83 mm	6.4	12 h 25	80	Good coverage
October	18°C	5.1°C	79 mm	7.8	11 h 01	52	Good coverage
November	9.4°C	-1.1°C	69 mm	7.8	9 h 48	14	Good coverage
December	2.2°C	-6.7°C	55 mm	7.1	9 h 12	5	Good coverage

What has changed

La Salle 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

+0.4

Feb

-0.2

Mar

+1.1

Apr

-0.6

May

+0.2

Jun

-0.1

Jul

-1.1

Aug

-0.5

Sep

+0.8

Oct

0.0

Nov

-0.1

Dec

+1.9

September daytime highs, 2011–2025. Last recorded: 26.6°C.

Records at PERU, 1963–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C8 Jan 2008	-32.2°C19 Jan 1985	44 mm12 Jan 1966	129 mm1965 · driest 2 mm in 1981	63
February	24.4°C28 Feb 2024	-30.0°C1 Feb 2019	74 mm21 Feb 1997	128 mm1997 · driest 1 mm in 1969	62
March	28.9°C22 Mar 2012	-23.3°C3 Mar 2014	79 mm3 Mar 1985	182 mm2009 · driest 22 mm in 1978	62
April	32.8°C22 Apr 1980	-10.6°C7 Apr 1982	61 mm2 Apr 1983	199 mm1981 · driest 22 mm in 2003	60
May	37.2°C29 May 1987	-3.9°C7 May 1989	108 mm17 May 1974	264 mm1970 · driest 6 mm in 1992	60
June	38.3°C26 Jun 1988	2.8°C9 Jun 1969	89 mm13 Jun 1981	248 mm1972 · driest 10 mm in 1988	62
July	40.0°C29 Jul 1983	5.6°C5 Jul 1972	105 mm22 Jul 1997	267 mm2008 · driest 4 mm in 1991	61
August	39.4°C17 Aug 1988	4.4°C28 Aug 1986	114 mm20 Aug 1979	315 mm1979 · driest 8 mm in 1984	61
September	36.7°C2 Sep 2000	-2.8°C23 Sep 1974	82 mm6 Sep 1989	258 mm1970 · driest 0 mm in 1979	63
October	32.8°C10 Oct 2010	-8.9°C28 Oct 1976	100 mm10 Oct 1969	190 mm1984 · driest 2 mm in 1964	63
November	26.1°C2 Nov 2000	-20.6°C26 Nov 1977	55 mm30 Nov 2006	235 mm1985 · driest 6 mm in 1976	63
December	21.1°C4 Dec 2012	-29.4°C23 Dec 1989	75 mm24 Dec 1965	143 mm1982 · driest 8 mm in 1976	62

Typical days per month at PERU, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	1	6
February	0	0	26	2	5
March	<1	0	22	2	2
April	4	<1	8	3	<1
May	12	4	<1	3	0
June	23	10	0	4	0
July	28	13	0	4	0
August	26	10	0	3	0
September	17	6	<1	2	0
October	5	<1	6	3	<1
November	<1	0	19	3	1
December	0	0	27	2	5

How often, not how much — every day in PERU’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%	19%	4%	15%	-4.8–2.7°C
February	<1%	18%	4%	14%	-3.2–5.8°C
March	5%	25%	7%	29%	5.1–12.3°C
April	22%	32%	11%	40%	14.0–19.2°C
May	49%	31%	12%	37%	19.6–26.0°C
June	70%	28%	12%	30%	26.2–29.6°C
July	73%	27%	11%	32%	27.7–31.8°C
August	75%	24%	11%	25%	26.3–30.2°C
September	69%	22%	9%	23%	23.1–27.6°C
October	34%	23%	8%	25%	15.9–20.9°C
November	6%	24%	8%	24%	5.9–12.2°C
December	<1%	22%	6%	21%	-0.6–6.2°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.

1964Each stripe is one year’s mean temperature against the 55-year average. Warmest: 2012. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4898875
NOAA station: USC00116753 · PERU
Station distance: 2.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 41.33°, 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 PERU is what differs

Peru→Spring Valley→Oglesby→Deer Park→Ladd→Utica→

Or put two places side by side: La Salle vs Peru

Best time to visitLa Salle.