Japan · 1991–2020

Best time to visit
Ichihara.

May leads for comfortable weather in Ichihara: typically 23.3°C by day, 15.2°C at night, with 130 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.3°C

Typical low15.2°C

Rain in May130 mm

Comfort

May

May · October · June

77climate match

Beach

July

July · August · September

66climate match

Outdoors

November

November · April · December

72climate match

The weakest month is February, scoring 25 against May’s 77 — days reach only 10.6°C, 13° 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

2610.1° / 1.7°

Feb

2510.6° / 2.3°

Mar

3213.7° / 5.2°

Apr

5418.8° / 10.1°

May

7723.3° / 15.2°

Jun

5725.8° / 18.8°

Jul

4529.6° / 23.1°

Aug

4431.2° / 24.3°

Sep

4527.6° / 20.9°

Oct

5822.4° / 15°

Nov

5317.3° / 9.5°

Dec

3612.5° / 4.4°

Monthly climate evidence for Ichihara — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 22 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	10.1°C	1.7°C	55 mm	4.8	13.6°C	10 h	26	Good coverage
February	10.6°C	2.3°C	71 mm	6.5	12.5°C	10 h 50	25	Good coverage
March	13.7°C	5.2°C	109 mm	10.2	13.2°C	11 h 52	32	Good coverage
April	18.8°C	10.1°C	132 mm	10	15.0°C	13 h 02	54	Good coverage
May	23.3°C	15.2°C	130 mm	10.1	17.9°C	14 h 01	77	Good coverage
June	25.8°C	18.8°C	182 mm	13.3	20.9°C	14 h 33	57	Good coverage
July	29.6°C	23.1°C	139 mm	10.9	23.4°C	14 h 20	45	Good coverage
August	31.2°C	24.3°C	112 mm	8.3	25.9°C	13 h 30	44	Good coverage
September	27.6°C	20.9°C	211 mm	11.4	24.7°C	12 h 21	45	Good coverage
October	22.4°C	15°C	251 mm	10.4	21.6°C	11 h 13	58	Good coverage
November	17.3°C	9.5°C	108 mm	8.5	18.9°C	10 h 15	53	Good coverage
December	12.5°C	4.4°C	65 mm	6.1	16.0°C	9 h 46	36	Good coverage

What has changed

Ichihara runs +2.0°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

+1.1

Feb

+1.7

Mar

+3.0

Apr

+1.9

May

+2.0

Jun

+2.4

Jul

+2.9

Aug

+2.3

Sep

+2.0

Oct

+1.7

Nov

+1.9

Dec

+0.8

May daytime highs, 2011–2025. Last recorded: 22.6°C.

Records at CHIBA, 1967–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.7°C27 Jan 1969	-5.1°C17 Jan 1970	76 mm15 Jan 2006	161 mm2020 · driest 0 mm in 2026	57
February	24.7°C14 Feb 2009	-5.2°C13 Feb 1967	80 mm15 Feb 2014	191 mm1985 · driest 0 mm in 2026	57
March	25.7°C26 Mar 2025	-4.4°C6 Mar 1977	88 mm30 Mar 1977	190 mm2018 · driest 9 mm in 1973	58
April	28.7°C22 Apr 2004	0.4°C1 Apr 2001	91 mm13 Apr 2020	237 mm2022 · driest 0 mm in 2025	58
May	31.7°C31 May 2014	6.8°C2 May 1993	70 mm21 May 2019	228 mm2008 · driest 0 mm in 2025	57
June	36.4°C30 Jun 2022	11.2°C21 Jun 1981	120 mm7 Jun 2014	343 mm1985 · driest 0 mm in 2025	57
July	37.8°C20 Jul 2004	12.5°C3 Jul 1976	172 mm8 Jul 2000	402 mm2021 · driest 0 mm in 2025	58
August	38.5°C7 Aug 2015	16.5°C9 Aug 1980	183 mm4 Aug 1986	323 mm1988 · driest 0 mm in 2025	56
September	36.2°C4 Sep 2010	11.7°C27 Sep 1969	260 mm22 Sep 1996	408 mm2015 · driest 0 mm in 2025	56
October	32.8°C6 Oct 2016	5.8°C31 Oct 1983	182 mm25 Oct 2019	532 mm2004 · driest 0 mm in 2025	57
November	27.5°C7 Nov 2023	-0.9°C26 Nov 1969	86 mm12 Nov 2004	218 mm2003 · driest 0 mm in 2025	57
December	24.2°C16 Dec 2023	-3.7°C31 Dec 1967	80 mm24 Dec 1972	190 mm1968 · driest 0 mm in 2025	57

Typical days per month at CHIBA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	3	2
February	0	0	3	2
March	0	0	<1	4
April	<1	0	0	3
May	9	<1	0	4
June	18	2	0	4
July	26	16	0	3
August	28	22	0	3
September	21	8	0	5
October	6	<1	0	5
November	<1	0	0	3
December	0	0	<1	2

How often, not how much — every day in CHIBA’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%	17%	6%	10%	8.2–11.2°C
February	<1%	24%	9%	28%	8.5–12.3°C
March	3%	35%	14%	38%	11.5–15.7°C
April	25%	36%	15%	41%	16.9–20.2°C
May	61%	34%	14%	34%	21.3–24.3°C
June	59%	42%	18%	56%	23.3–26.9°C
July	68%	33%	14%	33%	26.2–31.3°C
August	74%	28%	11%	33%	29.1–32.8°C
September	62%	38%	19%	48%	25.2–29.1°C
October	52%	35%	18%	35%	20.5–23.3°C
November	16%	27%	10%	28%	15.3–18.6°C
December	<1%	18%	7%	12%	10.6–13.7°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.

1967Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2025. Coolest: 1984.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2112664
NOAA station: JA000047682 · CHIBA
Station distance: 9.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 35.52°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 22 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 CHIBA is what differs

Chiba→Honchō→Yachiyo→Narashino→Sakura→Narita→

Or put two places side by side: Ichihara vs Chiba

Best time to visitIchihara.

May

July

November

The whole year,without the guesswork.

Ichihara runs +2.0°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Ichihara.

The whole year,
without the guesswork.

Ichihara runs +2.0°C
on the 1961–1990 baseline.

Nearby, measured,
and named.