Japan · 1991–2020

Best time to visit
Chikuma.

May leads for comfortable weather in Chikuma: typically 23.1°C by day, 10.3°C at night, with 75 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.1°C

Typical low10.3°C

Rain in May75 mm

Comfort

May

May · June · September

78climate match

Beach

August

August · July · June

71climate match

Outdoors

May

May · October · April

77climate match

The weakest month is January, scoring 5 against May’s 78 — days reach only 3.8°C, 20° 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

53.8° / -4.6°

Feb

55.3° / -4.2°

Mar

1310.4° / -1.2°

Apr

4917.5° / 4.2°

May

7823.1° / 10.3°

Jun

7526° / 15.6°

Jul

4629.8° / 20.2°

Aug

4831.2° / 21.2°

Sep

6826.2° / 16.9°

Oct

5919.6° / 9.6°

Nov

3713.4° / 2.6°

Dec

57° / -2°

Monthly climate evidence for Chikuma — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.8°C	-4.6°C	74 mm	12.7	9 h 55	5	Good coverage
February	5.3°C	-4.2°C	62 mm	10.4	10 h 48	5	Good coverage
March	10.4°C	-1.2°C	70 mm	11.4	11 h 51	13	Good coverage
April	17.5°C	4.2°C	67 mm	8.9	13 h 04	49	Good coverage
May	23.1°C	10.3°C	75 mm	8.4	14 h 05	78	Good coverage
June	26°C	15.6°C	110 mm	10.5	14 h 38	75	Good coverage
July	29.8°C	20.2°C	145 mm	14	14 h 25	46	Good coverage
August	31.2°C	21.2°C	117 mm	9.7	13 h 33	48	Good coverage
September	26.2°C	16.9°C	141 mm	9.7	12 h 22	68	Good coverage
October	19.6°C	9.6°C	122 mm	8.2	11 h 11	59	Good coverage
November	13.4°C	2.6°C	47 mm	7.2	10 h 10	37	Good coverage
December	7°C	-2°C	56 mm	10.5	9 h 41	5	Good coverage

Records at NAGANO, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.7°C5 Jan 1960	-15.0°C17 Jan 1967	43 mm7 Jan 1963	156 mm2002 · driest 0 mm in 2026	75
February	21.5°C27 Feb 1954	-13.7°C3 Feb 1954	40 mm15 Feb 2014	97 mm1989 · driest 0 mm in 2026	75
March	27.6°C27 Mar 2025	-10.9°C2 Mar 1957	32 mm9 Mar 2018	108 mm1966 · driest 0 mm in 2026	75
April	30.6°C22 Apr 2004	-4.9°C2 Apr 1957	60 mm9 Apr 2024	127 mm1998 · driest 0 mm in 2025	75
May	34.2°C27 May 2019	-0.7°C4 May 1957	68 mm28 May 2024	189 mm2011 · driest 0 mm in 2025	75
June	35.9°C25 Jun 2022	6.1°C1 Jun 1978	82 mm25 Jun 1996	273 mm1961 · driest 0 mm in 2025	75
July	36.9°C23 Jul 2000	10.7°C1 Jul 1967	228 mm30 Jul 1994	328 mm2020 · driest 0 mm in 2025	75
August	38.7°C16 Aug 1994	10.7°C20 Aug 1956	93 mm12 Aug 2017	232 mm2013 · driest 0 mm in 2025	73
September	36.3°C1 Sep 2002	5.5°C29 Sep 1960	115 mm12 Sep 1982	249 mm2018 · driest 0 mm in 2025	73
October	31.7°C6 Oct 1961	-1.9°C31 Oct 1983	119 mm21 Oct 2004	319 mm2004 · driest 0 mm in 2025	74
November	26.2°C1 Nov 1977	-11.4°C29 Nov 1951	60 mm2 Nov 2024	125 mm1951 · driest 0 mm in 2025	74
December	22.0°C4 Dec 2018	-11.2°C30 Dec 1976	55 mm27 Dec 2006	119 mm1980 · driest 0 mm in 2025	74

Typical days per month at NAGANO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	15	1
February	0	0	14	1
March	0	0	12	2
April	2	<1	2	2
May	11	1	0	2
June	18	3	0	3
July	26	15	0	4
August	28	20	0	3
September	17	6	0	4
October	2	<1	0	3
November	0	0	4	1
December	0	0	12	1

How often, not how much — every day in NAGANO’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%	35%	4%	39%	1.6–5.3°C
February	<1%	34%	5%	38%	2.6–7.1°C
March	2%	32%	6%	34%	7.6–11.4°C
April	25%	31%	9%	31%	15.6–19.4°C
May	54%	31%	9%	32%	21.1–24.3°C
June	59%	39%	15%	52%	24.0–26.7°C
July	59%	42%	16%	49%	27.1–31.4°C
August	69%	31%	12%	37%	28.8–32.6°C
September	61%	36%	15%	45%	23.6–27.8°C
October	30%	28%	10%	24%	17.7–20.5°C
November	2%	25%	5%	23%	11.6–14.5°C
December	0%	28%	4%	29%	5.1–8.3°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.

1951Each stripe is one year’s mean temperature against the 43-year average. Warmest: 2025. Coolest: 1981.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6822112
NOAA station: JA000047610 · NAGANO
Station distance: 18.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 36.53°, 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 NAGANO is what differs

Nagano→Suzaka→Nakano→Iiyama→Sakaki→Hirao→

Or put two places side by side: Chikuma vs Nagano

Best time to visitChikuma.

May

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Chikuma.

The whole year,
without the guesswork.

Nearby, measured,
and named.