United States · 1991–2020

Best time to visit
Dennison.

March leads for comfortable weather in Dennison: typically 22.7°C by day, 11.3°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMarch

Typical high22.7°C

Typical low11.3°C

Rain in March94 mm

Comfort

March

March · April · October

78climate match

Beach

September

September · May · October

72climate match

Outdoors

February

February · March · November

78climate match

The weakest month is July, scoring 24 against March’s 78 — days average 33.2°C, 9° above the 24°C the score treats as ideal, and 194 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

4417.4° / 6.4°

Feb

5819.1° / 7.9°

Mar

7822.7° / 11.3°

Apr

7726.3° / 14.9°

May

5629.8° / 19.3°

Jun

3232.1° / 22.4°

Jul

2433.2° / 23.3°

Aug

3333.5° / 23.2°

Sep

4831.5° / 20.8°

Oct

7327.4° / 15.5°

Nov

7122.3° / 10.2°

Dec

5318.1° / 6.7°

Monthly climate evidence for Dennison — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 36 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	17.4°C	6.4°C	133 mm	8.1	14.7°C	10 h 25	44	Good coverage
February	19.1°C	7.9°C	103 mm	6.6	15.5°C	11 h 05	58	Good coverage
March	22.7°C	11.3°C	94 mm	6.1	18.5°C	11 h 54	78	Good coverage
April	26.3°C	14.9°C	129 mm	4.8	22.1°C	12 h 51	77	Good coverage
May	29.8°C	19.3°C	128 mm	7.7	25.7°C	13 h 38	56	Good coverage
June	32.1°C	22.4°C	186 mm	10.8	28.9°C	14 h 04	32	Good coverage
July	33.2°C	23.3°C	194 mm	12.1	29.9°C	13 h 54	24	Good coverage
August	33.5°C	23.2°C	138 mm	10.2	30.0°C	13 h 13	33	Good coverage
September	31.5°C	20.8°C	127 mm	6.9	28.4°C	12 h 18	48	Good coverage
October	27.4°C	15.5°C	123 mm	6	24.5°C	11 h 24	73	Good coverage
November	22.3°C	10.2°C	119 mm	6.6	19.8°C	10 h 36	71	Good coverage
December	18.1°C	6.7°C	102 mm	6.8	16.5°C	10 h 14	53	Good coverage

Records at NEW IBERIA AP - ACADIANA RGNL, 1891–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	29.4°C3 Jan 2006	-16.7°C22 Jan 2025	131 mm18 Jan 1898	320 mm1998 · driest 15 mm in 2003	100
February	29.4°C28 Feb 2001	-14.4°C13 Feb 1899	112 mm19 Feb 1991	314 mm1966 · driest 5 mm in 1954	99
March	32.2°C16 Mar 1955	-7.2°C3 Mar 1980	129 mm1 Mar 1965	373 mm1926 · driest 2 mm in 1955	98
April	34.4°C28 Apr 1987	0.6°C7 Apr 1971	201 mm14 Apr 1896	341 mm1979 · driest 8 mm in 1915	99
May	36.7°C23 May 2005	5.6°C12 May 1952	149 mm25 May 1961	437 mm1907 · driest 0 mm in 1899	98
June	38.9°C13 Jun 2006	11.7°C3 Jun 1956	286 mm7 Jun 1978	412 mm2001 · driest 13 mm in 1907	99
July	38.3°C28 Jul 1960	15.6°C15 Jul 1967	203 mm29 Jul 1954	530 mm1908 · driest 49 mm in 1956	99
August	39.4°C31 Aug 2000	15.0°C23 Aug 1956	165 mm6 Aug 1900	334 mm1989 · driest 0 mm in 1896	96
September	39.4°C4 Sep 2000	6.7°C29 Sep 1967	196 mm27 Sep 1913	532 mm1913 · driest 13 mm in 1895	97
October	35.6°C2 Oct 1926	-1.7°C30 Oct 1952	202 mm23 Oct 1984	542 mm1984 · driest 0 mm in 1952	99
November	31.1°C2 Nov 1978	-5.0°C22 Nov 1898	150 mm16 Nov 1927	342 mm2000 · driest 4 mm in 1967	98
December	30.6°C3 Dec 1982	-12.8°C23 Dec 1989	187 mm6 Dec 1971	426 mm1912 · driest 37 mm in 1975	98

Typical days per month at NEW IBERIA AP - ACADIANA RGNL, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	3	0	4	4
February	5	0	<1	3
March	12	<1	<1	3
April	21	4	0	3
May	28	18	0	4
June	29	26	0	5
July	30	29	0	5
August	30	28	0	4
September	28	23	0	4
October	24	9	<1	3
November	12	<1	1	4
December	4	0	3	3

How often, not how much — every day in NEW IBERIA AP - ACADIANA RGNL’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	29%	26%	11%	28%	14.1–20.1°C
February	36%	25%	12%	24%	15.8–21.6°C
March	60%	21%	10%	19%	19.8–24.9°C
April	78%	18%	9%	13%	24.2–27.9°C
May	80%	20%	12%	21%	28.0–30.6°C
June	69%	30%	15%	39%	30.7–33.1°C
July	61%	39%	19%	52%	31.3–33.8°C
August	65%	35%	15%	43%	31.5–34.1°C
September	75%	25%	12%	28%	29.4–32.4°C
October	80%	17%	8%	16%	25.3–28.5°C
November	56%	20%	9%	18%	19.6–24.3°C
December	30%	26%	12%	28%	15.7–20.5°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.

1893Each stripe is one year’s mean temperature against the 86-year average. Warmest: 1927. Coolest: 1958.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4322004
NOAA station: USC00166657 · NEW IBERIA AP - ACADIANA RGNL
Station distance: 10 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 29.95°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 36 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 NEW IBERIA AP - ACADIANA RGNL is what differs

Delcambre→Capitan→Charon→Coopersville→Coteau→Jefferson Island→

Or put two places side by side: Dennison vs Delcambre

Best time to visitDennison.