Choshi climate by month
What the weather is like
Choshi has a humid subtropical climate (Köppen Cfa): rain spread through the year and no real dry season.
The warmest month is August, when afternoons average 27° and nights 24°. February is the coolest month, with highs of 9° and lows of 5°. The difference between the warmest and the coolest month is about 18°.
About 1,677 mm of precipitation falls in an average year. September is the wettest month (225 mm, 18 wet days) and December the driest (73 mm, 6 wet days). Cloud cover ranges from 29% in December to 59% in June.
The sea reaches about 25° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Tokyo, the capital, Choshi is 2.8° cooler on a August afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 27° · August
- Coldest nights
- 5° · February
- Wettest month
- September
- Driest month
- December
- Clearest skies
- December · 29% cloud
- Warmest sea
- 25° · August
- Longest day
- 14 h 34 min
- Shortest day
- 9 h 45 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 10° | 9° | 12° | 16° | 19° | 22° | 25° | 27° | 25° | 21° | 17° | 12° |
| Average low | 5° | 5° | 8° | 12° | 16° | 19° | 22° | 24° | 22° | 18° | 13° | 8° |
| Precipitation | 85 mm | 85 mm | 155 mm | 134 mm | 138 mm | 173 mm | 127 mm | 118 mm | 225 mm | 238 mm | 126 mm | 73 mm |
| Wet days (≥1 mm) | 6.8 | 6.5 | 12.8 | 13.5 | 15 | 14.8 | 16.5 | 16.3 | 17.8 | 14.3 | 8.2 | 5.5 |
| Cloud cover | 30% | 36% | 44% | 44% | 51% | 59% | 50% | 36% | 43% | 41% | 38% | 29% |
| Sea temperature | 16° | 15° | 15° | 16° | 19° | 21° | 23° | 25° | 25° | 23° | 21° | 18° |
| Daylight | 9h 59 | 10h 53 | 11h 55 | 13h 04 | 14h 02 | 14h 34 | 14h 22 | 13h 33 | 12h 27 | 11h 20 | 10h 19 | 9h 45 |
| Month score | 42 | 40 | 32 | 51 | 58 | 55 | 59 | 58 | 62 | 62 | 70 | 57 |