Japan Climatic Classifications

CodeDescriptionGroupNumber of states/regionsStates/regions
CfaHumid subtropical, no dry seasonTemperate38 Aichi Akita Aomori Chiba Ehime Fukui Fukuoka Gifu Hiroshima Hyogo Ibaraki Kagawa Kagoshima Kanagawa Kochi Kumamoto Kyoto Mie Miyagi Miyazaki Nagasaki Nara Niigata Oita Okayama Okinawa Osaka Saga Saitama Shiga Shimane Tochigi Tokushima Tokyo Tottori Toyama Wakayama Yamaguchi
DfbHumid continental, no dry season, warm summerCold (continental)8 Fukushima Gumma Hokkaido Ishikawa Iwate Nagano Shizuoka Yamanashi
DfaHumid continental, no dry season, hot summerCold (continental)1 Yamagata

Summary: Most regions (38) in Japan lie in the Humid subtropical, no dry season climate zone (Köppen: Cfa). The mean average of annual temperatures range from a high of 23.6°C (74.48°F) in Okinawa to a low of 7.45°C (45.41°F) in Hokkaido.

Climate Japan: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)18.8(65.84)19.18(66.52)20.25(68.45)22.07(71.73)24.72(76.5)27.37(81.27)30.36(86.65)32.18(89.92)28.48(83.26)26.31(79.36)23.65(74.57)20.52(68.94)32.18(89.92)
Average high °C (°F)6.19(43.14)7.14(44.85)10.84(51.51)15.7(60.26)21.17(70.11)23.97(75.15)27.74(81.93)29.51(85.12)25.59(78.06)20.11(68.2)14.56(58.21)8.63(47.53)17.6(63.68)
Daily mean °C (°F)4.0(39.2)4.75(40.55)8.23(46.81)13.02(55.44)18.5(65.3)21.71(71.08)25.57(78.03)27.05(80.69)23.08(73.54)17.6(63.68)12.22(54.0)6.54(43.77)15.19(59.34)
Average low °C (°F)0.65(33.17)0.97(33.75)3.85(38.93)8.12(46.62)13.02(55.44)16.96(62.53)21.29(70.32)22.68(72.82)19.19(66.54)13.74(56.73)8.6(47.48)3.32(37.98)11.03(51.85)
Record low °C (°F)-12.68(9.18)-12.81(8.94)-7.5(18.5)-0.31(31.44)5.85(42.53)9.35(48.83)14.01(57.22)14.98(58.96)11.37(52.47)4.49(40.08)-1.21(29.82)-8.25(17.15)-12.81(8.94)
Average precipitation mm (inches)48.65(1.92)48.08(1.89)66.57(2.62)75.27(2.96)77.95(3.07)125.75(4.95)159.03(6.26)101.46(3.99)113.03(4.45)92.91(3.66)47.63(1.88)57.31(2.26)84.47(3.33)
Average precipitation days (≥ 1.0 mm)8.88.519.779.689.1313.2915.913.6212.328.757.779.6110.6
Average relative humidity (%)74.1574.3272.7172.573.3280.5882.6879.1578.9576.3674.3374.0376.09
Mean monthly sunshine hours6.717.19.4111.8112.712.6712.6612.5710.768.577.316.769.92

Japan Climate Graph

Japan

Japan’s Cities by Temperature

Japan’s states/regions ranking by average yearly temperature:

Okinawa
23.6°C | 74.48°F
Miyazaki
18.93°C | 66.07°F
Kagoshima
18.29°C | 64.92°F
Nagasaki
17.96°C | 64.33°F
Saga
17.45°C | 63.41°F
Tokyo
17.28°C | 63.1°F
Saitama
17.22°C | 63.0°F
Chiba
17.14°C | 62.85°F
Kochi
16.99°C | 62.58°F
Wakayama
16.97°C | 62.55°F
Fukuoka
16.97°C | 62.55°F
Kumamoto
16.81°C | 62.26°F
Tokushima
16.79°C | 62.22°F
Osaka
16.78°C | 62.2°F
Ibaraki
16.72°C | 62.1°F
Oita
16.67°C | 62.01°F
Okayama
16.6°C | 61.88°F
Kagawa
16.35°C | 61.43°F
Yamaguchi
16.33°C | 61.39°F
Aichi
16.31°C | 61.36°F
Ehime
16.29°C | 61.32°F
Shizuoka
16.25°C | 61.25°F
Mie
15.91°C | 60.64°F
Hyogo
15.72°C | 60.3°F
Kanagawa
15.67°C | 60.21°F
Nara
15.51°C | 59.92°F
Gifu
15.34°C | 59.61°F
Hiroshima
15.34°C | 59.61°F
Kyoto
15.3°C | 59.54°F
Shimane
15.09°C | 59.16°F
Ishikawa
14.84°C | 58.71°F
Tottori
14.64°C | 58.35°F
Shiga
14.45°C | 58.01°F
Fukui
14.43°C | 57.97°F
Niigata
14.15°C | 57.47°F
Gumma
13.22°C | 55.8°F
Toyama
12.79°C | 55.02°F
Miyagi
12.68°C | 54.82°F
Akita
12.27°C | 54.09°F
Tochigi
12.22°C | 54.0°F
Fukushima
12.02°C | 53.64°F
Yamanashi
11.94°C | 53.49°F
Yamagata
11.14°C | 52.05°F
Nagano
11.13°C | 52.03°F
Aomori
10.56°C | 51.01°F
Iwate
9.31°C | 48.76°F
Hokkaido
7.45°C | 45.41°F

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