United States · 1991–2020

Best time to visit
Halleck.

September leads for comfortable weather in Halleck: typically 26.9°C by day, 13°C at night, with 75 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.9°C

Typical low13°C

Rain in September75 mm

Comfort

September

September · May · August

78climate match

Beach

July

July · August · June

76climate match

Outdoors

October

October · April · September

81climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 3.4°C, 21° below the 24°C the score treats as ideal, and nights drop to -8.1°C.

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

53.4° / -8.1°

Feb

55.7° / -6.1°

Mar

3112.8° / -0.1°

Apr

5419° / 5.7°

May

7624.6° / 12.1°

Jun

5929.4° / 17.7°

Jul

5731.2° / 19.7°

Aug

6230.3° / 18°

Sep

7826.9° / 13°

Oct

6119.8° / 6°

Nov

3212.3° / -0.5°

Dec

55° / -6.3°

Monthly climate evidence for Halleck — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.4°C	-8.1°C	17 mm	3.1	9 h 39	5	Good coverage
February	5.7°C	-6.1°C	27 mm	3.9	10 h 38	5	Good coverage
March	12.8°C	-0.1°C	49 mm	6.2	11 h 49	31	Good coverage
April	19°C	5.7°C	93 mm	8.5	13 h 11	54	Good coverage
May	24.6°C	12.1°C	117 mm	9.3	14 h 20	76	Good coverage
June	29.4°C	17.7°C	122 mm	9.3	14 h 57	59	Good coverage
July	31.2°C	19.7°C	94 mm	6.2	14 h 42	57	Good coverage
August	30.3°C	18°C	98 mm	6.8	13 h 43	62	Good coverage
September	26.9°C	13°C	75 mm	6	12 h 24	78	Good coverage
October	19.8°C	6°C	80 mm	6.3	11 h 05	61	Strong coverage
November	12.3°C	-0.5°C	39 mm	4.2	9 h 57	32	Strong coverage
December	5°C	-6.3°C	30 mm	3.6	9 h 23	5	Strong coverage

What has changed

Halleck runs +0.5°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

+2.1

Feb

+0.6

Mar

+1.4

Apr

-0.9

May

-0.2

Jun

+0.7

Jul

-0.9

Aug

-0.4

Sep

+1.5

Oct

-0.3

Nov

+0.7

Dec

+2.0

September daytime highs, 2012–2025. Last recorded: 28.0°C.

Records at ST JOSEPH ROSECRANS MEM AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C8 Jan 2003	-31.7°C12 Jan 1974	63 mm1 Jan 1965	116 mm1949 · driest 0 mm in 2009	56
February	26.7°C26 Feb 2024	-30.6°C1 Feb 1979	40 mm27 Feb 2023	89 mm2023 · driest 0 mm in 2022	56
March	35.0°C21 Mar 2026	-25.0°C4 Mar 1978	61 mm4 Mar 1976	186 mm1973 · driest 7 mm in 1970	56
April	35.6°C28 Apr 1970	-16.7°C3 Apr 1975	78 mm26 Apr 2016	171 mm1999 · driest 14 mm in 2018	56
May	38.9°C26 May 2018	-1.7°C3 May 2005	118 mm17 May 1974	248 mm2015 · driest 34 mm in 1966	56
June	40.6°C27 Jun 1980	5.6°C1 Jun 1979	107 mm24 Jun 2021	339 mm1951 · driest 18 mm in 2016	56
July	41.7°C30 Jul 1980	5.0°C5 Jul 1972	117 mm7 Jul 2022	332 mm2020 · driest 7 mm in 2012	55
August	41.1°C25 Aug 2003	6.1°C18 Aug 2012	105 mm24 Aug 2007	250 mm1951 · driest 7 mm in 2015	53
September	39.4°C28 Sep 1953	-1.1°C28 Sep 1967	120 mm13 Sep 2016	271 mm1970 · driest 0 mm in 2011	54
October	36.1°C10 Oct 1963	-9.3°C18 Oct 2022	75 mm11 Oct 2021	209 mm1977 · driest 0 mm in 1975	55
November	27.8°C3 Nov 1978	-18.9°C29 Nov 1976	62 mm29 Nov 1975	112 mm1998 · driest 0 mm in 1966	54
December	22.8°C15 Dec 2021	-26.1°C9 Dec 2005	55 mm7 Dec 1980	89 mm2007 · driest 0 mm in 2002	54

Typical days per month at ST JOSEPH ROSECRANS MEM AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	<1	2
February	<1	0	24	<1	3
March	2	0	17	2	1
April	6	1	6	3	0
May	16	5	<1	4	0
June	26	15	0	4	0
July	30	21	0	3	0
August	29	17	0	3	0
September	21	8	<1	2	0
October	7	2	5	3	0
November	<1	0	17	1	0
December	0	0	27	<1	<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 (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in ST JOSEPH ROSECRANS MEM AP’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%	12%	2%	6%	-0.6–5.5°C
February	4%	13%	2%	9%	0.9–11.0°C
March	17%	20%	6%	18%	8.4–16.6°C
April	39%	27%	10%	31%	16.0–22.0°C
May	60%	29%	13%	35%	22.2–27.0°C
June	70%	30%	14%	36%	27.9–31.6°C
July	77%	22%	9%	22%	29.1–33.8°C
August	77%	23%	9%	25%	28.6–32.2°C
September	76%	21%	8%	19%	24.8–28.8°C
October	49%	18%	8%	16%	17.6–23.6°C
November	14%	14%	4%	8%	8.3–15.3°C
December	<1%	13%	3%	7%	2.4–8.5°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.

1948Each stripe is one year’s mean temperature against the 52-year average. Warmest: 2024. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4048954
NOAA station: USW00013993 · ST JOSEPH ROSECRANS MEM AP
Station distance: 22.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 23 usable years
Daylight: Calculated from latitude 39.58°, 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 ST JOSEPH ROSECRANS MEM AP is what differs

Saint Joseph→Wathena→Elwood→Agency→Amazonia→Taos→

Or put two places side by side: Halleck vs Saint Joseph

Best time to visitHalleck.