United States · 1991–2020

Best time to visit
Union.

April leads for comfortable weather in Union: typically 25.9°C by day, 13.8°C at night, with 126 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high25.9°C

Typical low13.8°C

Rain in April126 mm

Comfort

April

April · October · March

76climate match

Beach

September

September · May · October

69climate match

Outdoors

November

November · March · February

77climate match

The weakest month is July, scoring 31 against April’s 76 — days average 32.7°C, 9° above the 24°C the score treats as ideal, and 165 mm of rain falls.

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

3816.9° / 5.3°

Feb

5619° / 7.2°

Mar

7522.5° / 10.5°

Apr

7625.9° / 13.8°

May

5829.4° / 18.3°

Jun

3531.9° / 21.9°

Jul

3132.7° / 22.9°

Aug

3232.8° / 22.7°

Sep

4831° / 20.5°

Oct

7626.9° / 14.7°

Nov

6921.7° / 9.1°

Dec

4818° / 6.3°

Monthly climate evidence for Union — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	16.9°C	5.3°C	147 mm	8.9	10 h 24	38	Strong coverage
February	19°C	7.2°C	104 mm	7.2	11 h 05	56	Strong coverage
March	22.5°C	10.5°C	102 mm	6.5	11 h 54	75	Strong coverage
April	25.9°C	13.8°C	126 mm	6.2	12 h 51	76	Strong coverage
May	29.4°C	18.3°C	143 mm	6.7	13 h 39	58	Strong coverage
June	31.9°C	21.9°C	177 mm	10.6	14 h 04	35	Strong coverage
July	32.7°C	22.9°C	165 mm	11.8	13 h 54	31	Strong coverage
August	32.8°C	22.7°C	162 mm	11	13 h 14	32	Strong coverage
September	31°C	20.5°C	138 mm	7.8	12 h 18	48	Strong coverage
October	26.9°C	14.7°C	118 mm	5.8	11 h 23	76	Strong coverage
November	21.7°C	9.1°C	107 mm	5.9	10 h 36	69	Strong coverage
December	18°C	6.3°C	124 mm	7.7	10 h 13	48	Strong coverage

What has changed

Union runs +0.3°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

+0.5

Feb

+1.4

Mar

+1.0

Apr

-0.3

May

-0.1

Jun

+0.1

Jul

-0.2

Aug

+0.1

Sep

+0.2

Oct

+0.7

Nov

-0.4

Dec

+0.8

April daytime highs, 2011–2025. Last recorded: 27.3°C.

Records at DONALDSONVILLE 4 SW, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	33.3°C27 Jan 1914	-12.2°C22 Jan 2025	183 mm2 Jan 1911	479 mm1998 · driest 8 mm in 1928	133
February	31.1°C28 Feb 1918	-16.1°C13 Feb 1899	166 mm28 Feb 1907	379 mm1988 · driest 7 mm in 1989	132
March	34.4°C24 Mar 1907	-4.4°C4 Mar 2002	156 mm11 Mar 2016	359 mm1988 · driest 0 mm in 1955	133
April	36.1°C23 Apr 1911	0.0°C13 Apr 1940	239 mm8 Apr 2003	388 mm1991 · driest 3 mm in 1915	134
May	37.8°C25 May 1915	5.0°C4 May 2013	206 mm22 May 1916	642 mm2021 · driest 0 mm in 1998	134
June	38.9°C30 Jun 1954	12.2°C11 Jun 1955	237 mm5 Jun 1928	616 mm2001 · driest 1 mm in 1930	134
July	38.9°C13 Jul 1901	15.0°C15 Jul 1967	135 mm29 Jul 1954	358 mm1908 · driest 22 mm in 1947	134
August	40.6°C28 Aug 2023	15.6°C23 Aug 1956	368 mm26 Aug 1926	560 mm2016 · driest 14 mm in 1950	133
September	39.4°C18 Sep 1927	6.1°C28 Sep 1909	203 mm12 Sep 1998	497 mm1943 · driest 2 mm in 1950	133
October	37.8°C2 Oct 1900	-3.3°C30 Oct 1952	193 mm26 Oct 1996	351 mm1985 · driest 0 mm in 1978	133
November	33.3°C1 Nov 1934	-6.1°C25 Nov 1950	307 mm14 Nov 1961	439 mm1929 · driest 7 mm in 2025	133
December	32.2°C2 Dec 1913	-12.8°C23 Dec 1989	156 mm2 Dec 2023	400 mm2009 · driest 29 mm in 1991	131

Typical days per month at DONALDSONVILLE 4 SW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	3	0	7	4
February	4	0	3	3
March	12	<1	1	3
April	21	3	0	3
May	29	17	0	3
June	30	26	0	5
July	31	29	0	5
August	31	29	0	5
September	29	22	0	4
October	23	8	0	3
November	9	<1	1	3
December	4	0	5	4

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

How often, not how much — every day in DONALDSONVILLE 4 SW’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	32%	26%	13%	28%	14.4–21.7°C
February	42%	25%	13%	25%	16.4–22.5°C
March	62%	22%	11%	20%	20.6–25.9°C
April	77%	19%	11%	15%	25.1–28.7°C
May	78%	22%	12%	22%	28.4–32.0°C
June	70%	30%	14%	37%	31.2–34.3°C
July	61%	39%	17%	53%	32.1–34.7°C
August	64%	36%	16%	45%	32.1–34.7°C
September	74%	26%	12%	28%	30.2–33.6°C
October	81%	16%	8%	14%	26.1–29.6°C
November	60%	19%	10%	17%	19.8–24.9°C
December	35%	26%	13%	27%	16.3–22.0°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.

1894Each stripe is one year’s mean temperature against the 116-year average. Warmest: 1927. Coolest: 1983.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4344186
NOAA station: USC00162534 · DONALDSONVILLE 4 SW
Station distance: 12 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 30.09°, 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 DONALDSONVILLE 4 SW is what differs

Donaldsonville→Pierre Part→Belle Rose→Sorrento→French Settlement→Paincourtville→

Or put two places side by side: Union vs Donaldsonville

Best time to visitUnion.