United States · 1991–2020

Best time to visit
Bishop Hill.

September leads for comfortable weather in Bishop Hill: typically 24.7°C by day, 11.1°C at night, with 106 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.7°C

Typical low11.1°C

Rain in September106 mm

Comfort

September

September · August · June

77climate match

Beach

July

July · August · June

76climate match

Outdoors

October

October · September · May

72climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only -1.1°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

5-1.1° / -10.4°

Feb

51.8° / -8.1°

Mar

129.1° / -2.4°

Apr

3816.4° / 3.6°

May

6622.6° / 10.4°

Jun

6927.3° / 15.6°

Jul

6829° / 17.4°

Aug

7428° / 16°

Sep

7724.7° / 11.1°

Oct

5217.7° / 4.8°

Nov

159.1° / -1.5°

Dec

52.2° / -7°

Monthly climate evidence for Bishop Hill — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-1.1°C	-10.4°C	41 mm	4.5	9 h 30	5	Strong coverage
February	1.8°C	-8.1°C	42 mm	4.7	10 h 33	5	Strong coverage
March	9.1°C	-2.4°C	65 mm	7.1	11 h 48	12	Strong coverage
April	16.4°C	3.6°C	108 mm	9.5	13 h 15	38	Strong coverage
May	22.6°C	10.4°C	133 mm	10.7	14 h 28	66	Strong coverage
June	27.3°C	15.6°C	130 mm	9.4	15 h 08	69	Good coverage
July	29°C	17.4°C	92 mm	6.9	14 h 52	68	Strong coverage
August	28°C	16°C	91 mm	6.7	13 h 49	74	Strong coverage
September	24.7°C	11.1°C	106 mm	6.6	12 h 25	77	Strong coverage
October	17.7°C	4.8°C	74 mm	7.1	11 h 02	52	Strong coverage
November	9.1°C	-1.5°C	63 mm	6.1	9 h 49	15	Strong coverage
December	2.2°C	-7°C	49 mm	5.1	9 h 13	5	Good coverage

What has changed

Bishop Hill runs +0.4°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

+0.6

Feb

+0.4

Mar

+1.6

Apr

-0.5

May

-0.1

Jun

-0.1

Jul

-0.8

Aug

-0.4

Sep

+0.8

Oct

+0.3

Nov

+0.2

Dec

+2.8

September daytime highs, 2011–2025. Last recorded: 26.4°C.

Records at GALVA, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C24 Jan 1909	-35.6°C31 Jan 2019	66 mm24 Jan 1938	128 mm1965 · driest 2 mm in 1981	131
February	23.3°C28 Feb 2024	-33.3°C14 Feb 1905	80 mm20 Feb 1997	127 mm1997 · driest 0 mm in 2026	132
March	30.0°C24 Mar 1910	-24.4°C1 Mar 1962	66 mm25 Mar 1954	168 mm2009 · driest 5 mm in 1958	131
April	33.9°C10 Apr 1930	-12.8°C5 Apr 1920	120 mm18 Apr 2013	230 mm1967 · driest 0 mm in 1934	130
May	40.6°C31 May 1934	-5.6°C2 May 2005	77 mm26 May 1932	282 mm2019 · driest 12 mm in 1992	131
June	40.6°C2 Jun 1934	1.1°C6 Jun 1894	108 mm22 Jun 1974	283 mm2010 · driest 9 mm in 1963	131
July	43.9°C14 Jul 1936	6.7°C22 Jul 1947	155 mm7 Jul 1982	318 mm1992 · driest 7 mm in 1955	131
August	40.6°C18 Aug 1936	3.3°C30 Aug 1915	232 mm20 Aug 1924	319 mm1924 · driest 7 mm in 2013	132
September	38.3°C9 Sep 1933	-7.2°C30 Sep 2003	98 mm28 Sep 2019	418 mm2019 · driest 7 mm in 1956	133
October	33.9°C1 Oct 1897	-12.8°C29 Oct 1925	98 mm10 Oct 1954	331 mm1941 · driest 2 mm in 1964	133
November	28.3°C1 Nov 1950	-21.7°C28 Nov 1930	78 mm17 Nov 1928	202 mm1985 · driest 2 mm in 1917	132
December	21.1°C16 Dec 2021	-32.2°C28 Dec 1924	70 mm9 Dec 2003	157 mm1895 · driest 2 mm in 1995	129

Typical days per month at GALVA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	1	2
February	0	0	26	1	2
March	<1	0	21	2	<1
April	3	<1	8	4	<1
May	12	3	<1	4	0
June	23	9	0	5	0
July	27	13	0	3	0
August	26	9	0	3	0
September	15	5	<1	3	0
October	5	<1	6	2	<1
November	<1	0	19	2	<1
December	0	0	27	2	2

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 83); on 2011–2025 it is August (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GALVA’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%	17%	4%	12%	-4.9–3.5°C
February	<1%	19%	4%	13%	-2.8–5.9°C
March	6%	25%	7%	27%	4.8–12.4°C
April	23%	30%	11%	37%	13.5–19.4°C
May	50%	33%	12%	41%	19.9–25.5°C
June	69%	29%	13%	33%	25.5–30.1°C
July	76%	24%	10%	23%	28.0–32.3°C
August	76%	23%	9%	22%	26.9–31.3°C
September	66%	24%	10%	26%	22.8–27.6°C
October	36%	22%	8%	21%	15.7–21.6°C
November	5%	21%	6%	19%	6.0–12.3°C
December	<1%	19%	5%	16%	-1.8–5.6°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.

1894Each stripe is one year’s mean temperature against the 114-year average. Warmest: 1931. Coolest: 1917.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4884976
NOAA station: USC00113335 · GALVA
Station distance: 7.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 23 usable years
Daylight: Calculated from latitude 41.20°, 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 GALVA is what differs

Galva→Toulon→Lafayette→Ulah→

Or put two places side by side: Bishop Hill vs Galva

Best time to visitBishop Hill.