United States · 1991–2020

Best time to visit
Fort Boise (historical).

May leads for comfortable weather in Fort Boise (historical): typically 23.2°C by day, 8°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.2°C

Typical low8°C

Rain in May32 mm

Comfort

May

May · June · September

82climate match

Beach

July

July · June · August

71climate match

Outdoors

May

May · October · April

84climate match

The weakest month is January, scoring 5 against May’s 82 — days reach only 2.8°C, 21° 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

52.8° / -5°

Feb

137.9° / -3.1°

Mar

3813.9° / 0.4°

Apr

5818.1° / 3.2°

May

8223.2° / 8°

Jun

8028° / 11.7°

Jul

6633.8° / 15.7°

Aug

6932.8° / 14.1°

Sep

7827.2° / 8.5°

Oct

6118.9° / 2.9°

Nov

189.1° / -2°

Dec

53.3° / -5.1°

Monthly climate evidence for Fort Boise (historical) — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.8°C	-5°C	30 mm	6.4	9 h 15	5	Strong coverage
February	7.9°C	-3.1°C	17 mm	4.3	10 h 24	13	Strong coverage
March	13.9°C	0.4°C	22 mm	5.5	11 h 47	38	Strong coverage
April	18.1°C	3.2°C	23 mm	4.8	13 h 22	58	Strong coverage
May	23.2°C	8°C	32 mm	5.6	14 h 42	82	Strong coverage
June	28°C	11.7°C	17 mm	3.7	15 h 26	80	Strong coverage
July	33.8°C	15.7°C	6 mm	1.3	15 h 09	66	Strong coverage
August	32.8°C	14.1°C	3 mm	0.7	13 h 59	69	Strong coverage
September	27.2°C	8.5°C	12 mm	2	12 h 27	78	Strong coverage
October	18.9°C	2.9°C	19 mm	3.6	10 h 55	61	Strong coverage
November	9.1°C	-2°C	24 mm	5.4	9 h 35	18	Strong coverage
December	3.3°C	-5.1°C	35 mm	6.4	8 h 55	5	Strong coverage

Records at NYSSA, 1937–2020
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C10 Jan 1953	-28.3°C24 Jan 1962	27 mm11 Jan 1979	95 mm1970 · driest 1 mm in 2007	74
February	20.0°C28 Feb 1963	-27.8°C6 Feb 1989	39 mm13 Feb 1986	90 mm1986 · driest 0 mm in 2005	74
March	27.8°C24 Mar 1940	-12.2°C1 Mar 1993	18 mm17 Mar 1993	70 mm2011 · driest 1 mm in 2007	74
April	33.3°C25 Apr 1946	-6.7°C2 Apr 1953	26 mm14 Apr 2000	86 mm1978 · driest 0 mm in 1951	74
May	37.8°C30 May 1986	-4.4°C1 May 1986	32 mm8 May 2016	96 mm1957 · driest 1 mm in 1971	74
June	42.2°C19 Jun 1940	-1.7°C13 Jun 1992	32 mm16 Jun 1989	70 mm1947 · driest 0 mm in 2007	74
July	42.8°C13 Jul 2002	1.7°C5 Jul 1986	22 mm10 Jul 1997	48 mm1997 · driest 0 mm in 2013	75
August	41.1°C10 Aug 1998	2.8°C18 Aug 2009	45 mm12 Aug 1941	61 mm1968 · driest 0 mm in 1998	75
September	37.8°C2 Sep 1967	-2.2°C19 Sep 1965	38 mm6 Sep 2016	70 mm1940 · driest 0 mm in 2009	74
October	33.3°C10 Oct 1943	-10.6°C31 Oct 2002	28 mm29 Oct 1943	79 mm1956 · driest 0 mm in 2003	74
November	25.6°C8 Nov 2006	-18.3°C23 Nov 1985	29 mm27 Nov 1942	83 mm1942 · driest 2 mm in 2007	77
December	19.4°C23 Dec 1964	-27.8°C10 Dec 1972	51 mm15 Dec 2016	119 mm1983 · driest 1 mm in 1989	77

Typical days per month at NYSSA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	<1	3
February	0	0	21	<1	1
March	<1	0	14	<1	<1
April	2	<1	5	<1	0
May	11	3	<1	<1	0
June	20	11	0	<1	0
July	28	24	0	<1	0
August	27	23	0	<1	0
September	19	9	<1	<1	0
October	4	<1	7	<1	0
November	0	0	18	<1	<1
December	0	0	24	<1	2

How often, not how much — every day in NYSSA’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%	21%	2%	24%	-2.1–5.7°C
February	0%	18%	1%	18%	2.6–10.0°C
March	8%	18%	1%	16%	10.5–15.5°C
April	33%	16%	1%	13%	16.2–20.7°C
May	63%	16%	2%	17%	20.5–25.8°C
June	82%	14%	2%	9%	25.0–30.0°C
July	96%	4%	<1%	1%	31.5–35.3°C
August	95%	5%	<1%	3%	29.9–34.2°C
September	85%	8%	1%	5%	24.2–28.6°C
October	39%	13%	1%	11%	16.5–21.0°C
November	<1%	21%	2%	24%	7.0–11.5°C
December	0%	22%	2%	23%	0.0–6.3°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.

1939Each stripe is one year’s mean temperature against the 72-year average. Warmest: 1940. Coolest: 1985.2016

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5593393
NOAA station: USC00356179 · NYSSA
Station distance: 5.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 43.83°, 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 NYSSA is what differs

Nyssa→Apple Valley→Arcadia→Nyssa Heights→

Or put two places side by side: Fort Boise (historical) vs Nyssa

Best time to visitFort Boise (historical).

May

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Fort Boise (historical).

The whole year,
without the guesswork.

Nearby, measured,
and named.