Canada · 1991–2020

Best time to visit
Rock Island.

August leads for comfortable weather in Rock Island: typically 25.3°C by day, 12.7°C at night, with 117 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25.3°C

Typical low12.7°C

Rain in August117 mm

Comfort

August

August · June · July

73climate match

Beach

July

July · August · June

47climate match

Outdoors

September

September · May · June

75climate match

The weakest month is January, scoring 5 against August’s 73 — days reach only -3.7°C, 28° 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

5-3.7° / -14.5°

Feb

5-1.6° / -13.8°

Mar

53.5° / -8.7°

Apr

1611.3° / -1.1°

May

5019.2° / 5.8°

Jun

7223.7° / 11.2°

Jul

7026.2° / 13.9°

Aug

7325.3° / 12.7°

Sep

6421.1° / 8.4°

Oct

2613.6° / 2.7°

Nov

55.9° / -3°

Dec

5-0.6° / -9.5°

Monthly climate evidence for Rock Island — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.7°C	-14.5°C	72 mm	13.2	9 h 07	5	Strong coverage
February	-1.6°C	-13.8°C	62 mm	9.7	10 h 20	5	Strong coverage
March	3.5°C	-8.7°C	73 mm	10.5	11 h 46	5	Strong coverage
April	11.3°C	-1.1°C	84 mm	10.4	13 h 25	16	Strong coverage
May	19.2°C	5.8°C	100 mm	12	14 h 49	50	Strong coverage
June	23.7°C	11.2°C	113 mm	13	15 h 36	72	Strong coverage
July	26.2°C	13.9°C	121 mm	12.4	15 h 17	70	Strong coverage
August	25.3°C	12.7°C	117 mm	11	14 h 04	73	Strong coverage
September	21.1°C	8.4°C	95 mm	9.9	12 h 28	64	Strong coverage
October	13.6°C	2.7°C	107 mm	11.4	10 h 53	26	Strong coverage
November	5.9°C	-3°C	84 mm	11.6	9 h 29	5	Strong coverage
December	-0.6°C	-9.5°C	85 mm	13.3	8 h 47	5	Strong coverage

What has changed

Rock Island 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

+0.2

Feb

-0.6

Mar

-1.5

Apr

-1.0

May

0.0

Jun

-1.0

Jul

-0.3

Aug

+0.5

Sep

+1.0

Oct

+0.5

Nov

+0.1

Dec

+1.5

August daytime highs, 2011–2022. Last recorded: 25.9°C.

Records at NEWPORT, 1930–2023
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C16 Jan 1995	-38.9°C15 Jan 1957	53 mm8 Jan 1998	166 mm1979 · driest 10 mm in 2016	92
February	20.0°C22 Feb 2018	-38.9°C7 Feb 1993	59 mm15 Feb 2007	152 mm1997 · driest 9 mm in 1999	91
March	28.3°C31 Mar 1998	-35.6°C4 Mar 1938	65 mm7 Mar 2011	145 mm2011 · driest 17 mm in 1967	90
April	30.6°C28 Apr 1990	-18.9°C1 Apr 1964	54 mm27 Apr 2011	166 mm2011 · driest 18 mm in 2001	90
May	34.4°C28 May 2020	-6.7°C8 May 1966	51 mm17 May 2007	193 mm2011 · driest 30 mm in 1977	90
June	35.0°C15 Jun 2001	-2.2°C3 Jun 1986	96 mm14 Jun 1942	273 mm1978 · driest 17 mm in 1933	90
July	36.7°C18 Jul 1953	2.2°C2 Jul 1992	81 mm29 Jul 1938	185 mm2013 · driest 29 mm in 1934	90
August	35.0°C9 Aug 2001	0.0°C31 Aug 1965	104 mm29 Aug 2011	283 mm2004 · driest 35 mm in 1996	90
September	35.6°C4 Sep 1999	-5.0°C27 Sep 1956	91 mm5 Sep 2012	216 mm1999 · driest 22 mm in 1933	90
October	28.9°C11 Oct 1949	-11.7°C26 Oct 1936	81 mm1 Oct 2010	229 mm2005 · driest 14 mm in 1994	90
November	23.9°C6 Nov 2022	-21.7°C26 Nov 1938	84 mm1 Nov 2019	192 mm2018 · driest 17 mm in 1939	92
December	18.9°C7 Dec 1998	-40.0°C30 Dec 1933	52 mm17 Dec 2000	189 mm2003 · driest 17 mm in 1935	90

Typical days per month at NEWPORT, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	2	13
February	0	0	27	2	10
March	<1	0	28	2	8
April	<1	0	19	3	2
May	6	1	3	3	<1
June	13	3	0	4	0
July	20	5	0	4	0
August	18	3	0	4	0
September	7	1	1	3	0
October	<1	0	10	4	<1
November	0	0	22	2	5
December	0	0	29	2	12

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 82); on 2011–2025 it is August (83). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in NEWPORT’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%	42%	6%	60%	-7.3–-0.3°C
February	0%	39%	6%	51%	-4.7–0.8°C
March	<1%	39%	7%	51%	0.2–6.8°C
April	8%	40%	10%	49%	8.5–13.6°C
May	30%	41%	11%	53%	16.1–21.7°C
June	51%	41%	12%	52%	21.9–25.7°C
July	60%	39%	14%	46%	24.4–27.9°C
August	58%	38%	13%	47%	23.4–26.6°C
September	38%	36%	11%	45%	18.8–22.5°C
October	12%	38%	11%	49%	11.1–15.9°C
November	<1%	43%	9%	62%	3.4–8.3°C
December	0%	43%	7%	63%	-4.6–1.9°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.

1931Each stripe is one year’s mean temperature against the 84-year average. Warmest: 1999. Coolest: 1958.2022

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6126336
NOAA station: USC00435542 · NEWPORT
Station distance: 9.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 45.01°, 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 NEWPORT is what differs

Newport→Stanstead→Beebe Plain→Orleans→Derby Line→Holland→

Or put two places side by side: Rock Island vs Newport

Best time to visitRock Island.