United States · 1991–2020

Best time to visit
Roselle.

September leads for comfortable weather in Roselle: typically 25.2°C by day, 9.9°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.2°C

Typical low9.9°C

Rain in September87 mm

Comfort

September

September · June · July

77climate match

Beach

July

July · August · June

68climate match

Outdoors

September

September · October · May

71climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only -0.2°C, 24° 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

5-0.2° / -10.9°

Feb

52.5° / -9.2°

Mar

88.6° / -4.3°

Apr

3616.1° / 1.5°

May

6122° / 7.1°

Jun

6827.9° / 13.3°

Jul

6730.2° / 15.8°

Aug

6729.1° / 15°

Sep

7725.2° / 9.9°

Oct

5018.1° / 3.6°

Nov

1610.1° / -2°

Dec

52.1° / -8.6°

Monthly climate evidence for Roselle — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 40 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-0.2°C	-10.9°C	47 mm	7.1	3.3°C	9 h 26	5	Good coverage
February	2.5°C	-9.2°C	44 mm	6.4	2.0°C	10 h 31	5	Good coverage
March	8.6°C	-4.3°C	51 mm	7.6	2.0°C	11 h 48	8	Good coverage
April	16.1°C	1.5°C	91 mm	9.8	3.8°C	13 h 17	36	Good coverage
May	22°C	7.1°C	119 mm	10	7.1°C	14 h 32	61	Good coverage
June	27.9°C	13.3°C	109 mm	9.7	14.1°C	15 h 13	68	Good coverage
July	30.2°C	15.8°C	85 mm	7.6	20.9°C	14 h 57	67	Good coverage
August	29.1°C	15°C	120 mm	7.8	22.5°C	13 h 52	67	Good coverage
September	25.2°C	9.9°C	87 mm	6.2	20.1°C	12 h 26	77	Good coverage
October	18.1°C	3.6°C	79 mm	7.6	14.5°C	11 h	50	Good coverage
November	10.1°C	-2°C	61 mm	6.8	9.2°C	9 h 45	16	Good coverage
December	2.1°C	-8.6°C	49 mm	8.1	5.6°C	9 h 08	5	Good coverage

Records at STREAMWOOD, 1994–2011
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C8 Jan 2008	-31.1°C16 Jan 2009	44 mm14 Jan 1995	110 mm1999 · driest 10 mm in 2003	17
February	21.7°C26 Feb 2000	-31.1°C3 Feb 1996	66 mm21 Feb 1997	123 mm1997 · driest 8 mm in 2003	17
March	28.3°C27 Mar 2007	-22.8°C4 Mar 2002	35 mm5 Mar 2004	119 mm2004 · driest 20 mm in 2000	17
April	32.2°C19 Apr 2002	-11.1°C5 Apr 1995	62 mm27 Apr 1995	169 mm1999 · driest 34 mm in 2004	17
May	36.1°C25 May 2010	-4.4°C3 May 2004	69 mm13 May 2010	221 mm2003 · driest 40 mm in 1994	17
June	38.3°C25 Jun 2005	1.1°C1 Jun 2003	152 mm24 Jun 1994	191 mm1994 · driest 31 mm in 2005	18
July	40.6°C15 Jul 1995	5.6°C2 Jul 2001	122 mm23 Jul 2011	185 mm2011 · driest 35 mm in 2004	18
August	38.9°C1 Aug 2006	3.3°C31 Aug 2009	81 mm22 Aug 2002	300 mm2007 · driest 48 mm in 1999	18
September	36.1°C2 Sep 2000	-3.3°C23 Sep 1995	108 mm19 Sep 2001	337 mm2008 · driest 5 mm in 2004	18
October	32.8°C5 Oct 2005	-6.7°C11 Oct 2009	121 mm14 Oct 2001	222 mm2001 · driest 23 mm in 2010	18
November	24.4°C4 Nov 2008	-14.4°C29 Nov 1995	51 mm11 Nov 1995	153 mm1994 · driest 13 mm in 1999	18
December	20.6°C6 Dec 2001	-25.6°C22 Dec 2000	36 mm5 Dec 1999	119 mm2008 · driest 16 mm in 2002	17

Typical days per month at STREAMWOOD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	2	9
February	0	0	26	1	7
March	<1	0	24	2	4
April	4	<1	12	3	1
May	10	4	2	4	0
June	22	12	0	4	0
July	28	17	0	2	0
August	27	14	0	4	0
September	16	7	<1	2	0
October	5	1	8	2	<1
November	0	0	20	2	2
December	0	0	29	1	9

How often, not how much — every day in STREAMWOOD’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%	23%	5%	21%	-2.8–3.0°C
February	<1%	23%	4%	20%	0.0–5.6°C
March	5%	25%	5%	30%	6.0–11.2°C
April	21%	33%	11%	40%	13.5–19.5°C
May	44%	32%	12%	46%	18.8–24.3°C
June	65%	32%	12%	37%	26.4–29.4°C
July	75%	25%	7%	30%	27.6–32.1°C
August	74%	25%	12%	24%	26.9–31.1°C
September	69%	21%	8%	22%	23.2–27.5°C
October	29%	24%	8%	23%	15.9–20.4°C
November	6%	23%	6%	25%	5.9–13.3°C
December	0%	26%	3%	30%	-0.9–5.3°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.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4908173
NOAA station: USC00118324 · STREAMWOOD
Station distance: 9.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 41.98°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 40 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 STREAMWOOD is what differs

Schaumburg→Hoffman Estates→Bartlett→Streamwood→Hanover Park→Bloomingdale→

Or put two places side by side: Roselle vs Schaumburg

Best time to visitRoselle.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Roselle.

The whole year,
without the guesswork.

Nearby, measured,
and named.