United States · 1991–2020

Best time to visit
Arlington Heights.

September leads for comfortable weather in Arlington Heights: typically 24°C by day, 10.9°C at night, with 82 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24°C

Typical low10.9°C

Rain in September82 mm

Comfort

September

September · June · August

82climate match

Beach

July

July · August · June

71climate match

Outdoors

May

May · September · October

78climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 1.9°C, 22° 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

51.9° / -8.3°

Feb

53.6° / -7.4°

Mar

58.1° / -3.1°

Apr

3214.9° / 2.4°

May

6320.6° / 7.9°

Jun

7625.5° / 13°

Jul

6928.9° / 16.3°

Aug

7528° / 15.3°

Sep

8224° / 10.9°

Oct

4216.9° / 4.7°

Nov

1711° / -0.2°

Dec

55° / -5°

Monthly climate evidence for Arlington Heights — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 26 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.9°C	-8.3°C	67 mm	7.7	4.9°C	9 h 23	5	Good coverage
February	3.6°C	-7.4°C	68 mm	6.9	3.3°C	10 h 29	5	Good coverage
March	8.1°C	-3.1°C	98 mm	8.2	3.5°C	11 h 48	5	Good coverage
April	14.9°C	2.4°C	99 mm	10	5.8°C	13 h 18	32	Good coverage
May	20.6°C	7.9°C	84 mm	9.7	10.1°C	14 h 34	63	Good coverage
June	25.5°C	13°C	103 mm	9.6	14.7°C	15 h 16	76	Good coverage
July	28.9°C	16.3°C	91 mm	8.2	18.2°C	15 h	69	Good coverage
August	28°C	15.3°C	85 mm	7.7	18.8°C	13 h 54	75	Good coverage
September	24°C	10.9°C	82 mm	6.9	17.0°C	12 h 26	82	Good coverage
October	16.9°C	4.7°C	111 mm	8.7	13.5°C	10 h 59	42	Good coverage
November	11°C	-0.2°C	90 mm	8.8	10.2°C	9 h 43	17	Good coverage
December	5°C	-5°C	95 mm	9.1	7.5°C	9 h 05	5	Good coverage

Records at BEDFORD HANSCOM FLD, 1949–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C12 Jan 2020	-28.9°C18 Jan 1957	67 mm15 Jan 1958	259 mm1958 · driest 16 mm in 1970	50
February	23.9°C21 Feb 2018	-26.0°C24 Feb 2015	56 mm13 Feb 2008	167 mm2008 · driest 15 mm in 2015	50
March	27.8°C22 Mar 2012	-21.7°C19 Mar 1967	132 mm14 Mar 2010	382 mm2010 · driest 15 mm in 2006	50
April	33.9°C17 Apr 2002	-14.4°C1 Apr 1964	83 mm1 Apr 2004	208 mm2004 · driest 23 mm in 1999	50
May	35.6°C22 May 2022	-3.3°C7 May 2001	73 mm13 May 2006	256 mm2006 · driest 19 mm in 1964	50
June	37.2°C26 Jun 1952	2.2°C8 Jun 2002	62 mm6 Jun 2000	261 mm2006 · driest 6 mm in 1999	50
July	38.9°C6 Jul 2010	5.6°C7 Jul 1965	77 mm12 Jul 2017	283 mm2021 · driest 14 mm in 1965	50
August	38.3°C5 Aug 1955	0.6°C31 Aug 1965	176 mm19 Aug 1955	378 mm1955 · driest 19 mm in 2007	50
September	38.3°C2 Sep 1953	-2.2°C25 Sep 1950	215 mm11 Sep 1954	279 mm1954 · driest 17 mm in 1957	50
October	31.1°C7 Oct 1963	-9.9°C31 Oct 2020	147 mm6 Oct 1962	310 mm1962 · driest 21 mm in 2024	50
November	28.9°C2 Nov 1950	-13.9°C17 Nov 1967	79 mm14 Nov 2009	257 mm1963 · driest 19 mm in 2012	50
December	24.4°C7 Dec 1998	-26.1°C31 Dec 1963	75 mm18 Dec 2023	213 mm2023 · driest 22 mm in 1955	50

Typical days per month at BEDFORD HANSCOM FLD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	28	2
February	0	0	26	2
March	<1	0	23	3
April	2	<1	10	3
May	8	2	1	3
June	18	6	0	3
July	26	13	0	3
August	24	10	0	3
September	13	3	<1	2
October	2	<1	7	4
November	<1	0	17	3
December	0	0	26	3

How often, not how much — every day in BEDFORD HANSCOM FLD’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%	28%	9%	31%	-1.1–4.7°C
February	<1%	27%	9%	30%	0.3–6.7°C
March	3%	28%	11%	31%	4.7–11.1°C
April	15%	32%	11%	39%	12.3–16.5°C
May	44%	30%	9%	35%	18.4–22.7°C
June	67%	28%	9%	33%	23.8–27.7°C
July	74%	25%	8%	23%	26.2–30.7°C
August	75%	25%	9%	23%	25.9–29.4°C
September	62%	23%	8%	23%	21.2–25.0°C
October	25%	25%	11%	27%	15.6–19.2°C
November	4%	29%	11%	34%	8.6–13.1°C
December	<1%	29%	11%	35%	1.3–7.6°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.

1949Each stripe is one year’s mean temperature against the 48-year average. Warmest: 2020. Coolest: 1962.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4929181
NOAA station: USW00014702 · BEDFORD HANSCOM FLD
Station distance: 10.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 42.42°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 26 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 BEDFORD HANSCOM FLD is what differs

Waltham→Lexington→Concord→Lincoln→South Lincoln→Baker Bridge→

Or put two places side by side: Arlington Heights vs Waltham

Best time to visitArlington Heights.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Arlington Heights.

The whole year,
without the guesswork.

Nearby, measured,
and named.