United States · 1991–2020

Best time to visit
Bonne Terre.

September leads for comfortable weather in Bonne Terre: typically 26.4°C by day, 13.5°C at night, with 74 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.4°C

Typical low13.5°C

Rain in September74 mm

Comfort

September

September · May · June

81climate match

Beach

June

June · July · August

74climate match

Outdoors

October

October · April · September

80climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 5.3°C, 19° 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

55.3° / -5.3°

Feb

88.3° / -3.4°

Mar

2713.7° / 1.4°

Apr

5019.8° / 6.9°

May

7224.3° / 12.2°

Jun

6928.7° / 17.1°

Jul

5630.8° / 19.4°

Aug

6030.3° / 18.3°

Sep

8126.4° / 13.5°

Oct

6320.5° / 7.1°

Nov

2613.2° / 1.4°

Dec

57.4° / -3°

Monthly climate evidence for Bonne Terre — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.3°C	-5.3°C	65 mm	6.2	9 h 48	5	Strong coverage
February	8.3°C	-3.4°C	68 mm	6.1	10 h 43	8	Strong coverage
March	13.7°C	1.4°C	98 mm	9.4	11 h 50	27	Strong coverage
April	19.8°C	6.9°C	141 mm	10	13 h 07	50	Strong coverage
May	24.3°C	12.2°C	142 mm	10.8	14 h 12	72	Strong coverage
June	28.7°C	17.1°C	88 mm	7.8	14 h 47	69	Strong coverage
July	30.8°C	19.4°C	105 mm	7.8	14 h 33	56	Strong coverage
August	30.3°C	18.3°C	99 mm	7.1	13 h 38	60	Strong coverage
September	26.4°C	13.5°C	74 mm	6.3	12 h 23	81	Strong coverage
October	20.5°C	7.1°C	88 mm	6.6	11 h 09	63	Strong coverage
November	13.2°C	1.4°C	103 mm	7.4	10 h 04	26	Strong coverage
December	7.4°C	-3°C	78 mm	7.2	9 h 33	5	Strong coverage

What has changed

Bonne Terre runs +0.9°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

+1.6

Feb

+1.5

Mar

+1.3

Apr

+0.2

May

+0.6

Jun

+0.7

Jul

+0.1

Aug

-0.3

Sep

+1.0

Oct

+0.4

Nov

+0.3

Dec

+2.9

September daytime highs, 2011–2023. Last recorded: 27.5°C.

Records at FARMINGTON, 1906–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C24 Jan 1943	-30.6°C11 Jan 1977	99 mm4 Jan 1950	278 mm1950 · driest 1 mm in 1943	108
February	31.1°C13 Feb 1962	-28.3°C18 Feb 1910	76 mm26 Feb 1910	164 mm2008 · driest 6 mm in 1947	108
March	34.4°C24 Mar 1929	-23.9°C6 Mar 1960	105 mm19 Mar 2008	264 mm1945 · driest 6 mm in 1910	110
April	33.9°C1 Apr 2012	-8.9°C10 Apr 1960	121 mm30 Apr 2017	368 mm2017 · driest 26 mm in 1971	107
May	36.1°C22 May 1925	-2.8°C10 May 1969	112 mm13 May 1935	340 mm1935 · driest 13 mm in 1934	105
June	41.1°C22 Jun 1930	3.9°C11 Jun 1988	126 mm30 Jun 1957	450 mm1935 · driest 6 mm in 1934	106
July	43.9°C25 Jul 1934	5.6°C23 Jul 1947	113 mm16 Jul 2021	250 mm2021 · driest 6 mm in 1970	106
August	45.6°C9 Aug 1934	3.3°C29 Aug 1986	121 mm3 Aug 2023	300 mm2023 · driest 2 mm in 1936	107
September	41.7°C6 Sep 1925	-2.8°C23 Sep 1995	164 mm12 Sep 1934	383 mm1934 · driest 3 mm in 1928	108
October	35.6°C2 Oct 1953	-8.9°C30 Oct 1980	126 mm30 Oct 1942	309 mm1941 · driest 4 mm in 1963	105
November	28.9°C11 Nov 1989	-21.1°C13 Nov 1986	106 mm18 Nov 2003	287 mm1985 · driest 4 mm in 1936	108
December	26.1°C3 Dec 2021	-27.2°C24 Dec 1983	99 mm3 Dec 1982	331 mm1982 · driest 4 mm in 1955	109

Typical days per month at FARMINGTON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	2
February	<1	0	21	2	2
March	2	0	13	3	<1
April	7	<1	3	4	0
May	15	3	0	5	0
June	25	12	0	3	0
July	29	19	0	3	0
August	29	18	0	3	0
September	20	7	<1	3	0
October	8	<1	3	3	0
November	<1	0	13	3	<1
December	0	0	22	3	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 81); on 2011–2025 it is September (83). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in FARMINGTON’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%	21%	7%	19%	2.8–9.3°C
February	5%	22%	8%	21%	4.3–12.0°C
March	17%	28%	11%	33%	9.8–17.6°C
April	40%	30%	13%	36%	17.2–22.6°C
May	59%	32%	14%	40%	22.2–27.0°C
June	73%	27%	11%	28%	27.2–31.6°C
July	78%	22%	10%	20%	29.5–33.9°C
August	78%	22%	10%	21%	28.4–33.5°C
September	74%	22%	9%	19%	24.3–30.0°C
October	52%	21%	9%	21%	18.7–23.9°C
November	15%	23%	10%	21%	10.1–16.6°C
December	2%	22%	8%	21%	4.5–11.0°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.

1907Each stripe is one year’s mean temperature against the 93-year average. Warmest: 2012. Coolest: 1979.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4377913
NOAA station: USC00232809 · FARMINGTON
Station distance: 19.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 37.92°, 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 FARMINGTON is what differs

Farmington→Park Hills→Flat River→Desloge→Bismarck→Elvins→

Or put two places side by side: Bonne Terre vs Farmington

Best time to visitBonne Terre.