United States · 1991–2020

Best time to visit
Deer Park.

June leads for comfortable weather in Deer Park: typically 25.3°C by day, 14.6°C at night, with 117 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high25.3°C

Typical low14.6°C

Rain in June117 mm

Comfort

June

June · September · August

77climate match

Beach

July

July · August · June

66climate match

Outdoors

September

September · May · October

73climate match

The weakest month is January, scoring 5 against June’s 77 — days reach only -1.4°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

5-1.4° / -9.9°

Feb

50.5° / -8.9°

Mar

57° / -3.1°

Apr

3114.3° / 3°

May

5720.3° / 9.1°

Jun

7725.3° / 14.6°

Jul

7027.6° / 17°

Aug

7326.4° / 16.3°

Sep

7722.5° / 12°

Oct

4315.6° / 5.4°

Nov

128.1° / -0.8°

Dec

51.2° / -7°

Monthly climate evidence for Deer Park — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 29 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-1.4°C	-9.9°C	51 mm	7.1	3.4°C	9 h 25	5	Good coverage
February	0.5°C	-8.9°C	49 mm	6.6	2.2°C	10 h 30	5	Good coverage
March	7°C	-3.1°C	56 mm	7.4	2.1°C	11 h 48	5	Good coverage
April	14.3°C	3°C	100 mm	9.6	3.5°C	13 h 18	31	Good coverage
May	20.3°C	9.1°C	134 mm	10.6	6.2°C	14 h 33	57	Good coverage
June	25.3°C	14.6°C	117 mm	9.9	12.9°C	15 h 14	77	Good coverage
July	27.6°C	17°C	108 mm	8	20.1°C	14 h 58	70	Good coverage
August	26.4°C	16.3°C	116 mm	8.5	21.8°C	13 h 53	73	Good coverage
September	22.5°C	12°C	95 mm	7.5	19.4°C	12 h 26	77	Good coverage
October	15.6°C	5.4°C	87 mm	8.5	13.8°C	10 h 59	43	Good coverage
November	8.1°C	-0.8°C	61 mm	7	8.5°C	9 h 44	12	Good coverage
December	1.2°C	-7°C	58 mm	8.3	5.3°C	9 h 07	5	Good coverage

What has changed

Deer Park runs -0.2°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

+0.8

Feb

+0.2

Mar

+0.7

Apr

-0.8

May

-0.3

Jun

-0.9

Jul

-1.0

Aug

-1.0

Sep

-0.4

Oct

-0.8

Nov

-0.7

Dec

+1.8

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

Records at BARRINGTON 3SW, 1962–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.7°C8 Jan 2008	-33.3°C31 Jan 2019	76 mm23 Jan 1992	104 mm1965 · driest 1 mm in 1981	55
February	23.3°C28 Feb 2024	-32.2°C1 Feb 2019	41 mm25 Feb 2007	110 mm2008 · driest 0 mm in 1990	56
March	28.9°C22 Mar 2012	-22.8°C4 Mar 2002	49 mm13 Mar 2006	137 mm2004 · driest 10 mm in 1989	55
April	31.7°C30 Apr 1970	-15.0°C7 Apr 1982	99 mm18 Apr 2013	201 mm2026 · driest 20 mm in 1990	55
May	33.9°C28 May 2018	-5.6°C10 May 1966	114 mm31 May 2018	324 mm2018 · driest 7 mm in 1992	55
June	38.9°C28 Jun 1971	-1.1°C3 Jun 2000	77 mm29 Jun 2017	233 mm1993 · driest 14 mm in 2005	56
July	39.4°C10 Jul 1974	3.3°C6 Jul 1965	145 mm23 Jul 2011	271 mm2017 · driest 20 mm in 1990	56
August	37.8°C2 Aug 1988	3.3°C29 Aug 1965	136 mm22 Aug 2002	352 mm2007 · driest 14 mm in 1969	54
September	35.6°C9 Sep 1978	-3.9°C29 Sep 1964	106 mm23 Sep 1986	303 mm2008 · driest 0 mm in 1990	54
October	31.1°C1 Oct 1971	-10.0°C30 Oct 1988	76 mm15 Oct 2017	205 mm2017 · driest 2 mm in 1964	54
November	23.9°C1 Nov 1968	-23.3°C30 Nov 1976	52 mm27 Nov 1966	193 mm1985 · driest 8 mm in 1989	54
December	19.4°C4 Dec 2012	-28.9°C24 Dec 1983	53 mm3 Dec 1982	157 mm1982 · driest 5 mm in 1989	55

Typical days per month at BARRINGTON 3SW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	1	7
February	0	0	26	1	6
March	<1	0	22	2	3
April	2	<1	8	3	<1
May	8	1	<1	4	0
June	17	4	0	4	0
July	25	8	0	3	0
August	21	4	0	4	0
September	10	2	<1	3	0
October	2	0	5	3	<1
November	0	0	17	2	1
December	0	0	27	2	6

How often, not how much — every day in BARRINGTON 3SW’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%	21%	4%	19%	-6.0–2.0°C
February	<1%	20%	4%	18%	-3.8–4.3°C
March	3%	25%	7%	27%	3.7–10.3°C
April	17%	31%	10%	37%	11.5–17.5°C
May	41%	30%	12%	39%	18.2–23.3°C
June	64%	30%	13%	33%	23.8–28.2°C
July	74%	26%	10%	28%	26.0–29.7°C
August	73%	26%	11%	28%	25.3–28.6°C
September	56%	25%	9%	28%	20.9–24.7°C
October	24%	24%	7%	24%	13.6–18.8°C
November	3%	24%	8%	26%	6.1–11.5°C
December	0%	24%	5%	26%	-2.9–5.0°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.

1963Each stripe is one year’s mean temperature against the 45-year average. Warmest: 2024. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4889652
NOAA station: USC00110442 · BARRINGTON 3SW
Station distance: 8.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 42.16°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 29 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 BARRINGTON 3SW is what differs

Palatine→Barrington→Inverness→Fox River Grove→South Barrington→Barrington Hills→

Or put two places side by side: Deer Park vs Palatine

Best time to visitDeer Park.