Climate averages 1991–2020
Yachiyo weather
in January.
A cool, moderately wet month: the coolest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Yachiyo: daytime highs average 8.3°C and nights cool to about 1.0°C. By daytime temperature it is the coolest month of the year.
Expect about 69 mm of rain on roughly 7 days, which makes January a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 02 min on an average January day.
The nearest other city in this atlas is Narashino (10 km away). In January its highs average 8.4°C, about as warm as Yachiyo, with 69 mm of rain.
Among the 303 cities listed in Japan, Yachiyo ranks joint 101st of 303 for the warmest January highs and joint 161st of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Yachiyo is 1.3°C warmer than that mean.
From January to February, average highs rise by 0.8°C to 9.1°C, and monthly rainfall falls from 69 mm to 66 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Yachiyo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 8.3°C1.0°C | 1.0°C | 69 | 6.8 | 10.010 h |
| February | 9.1°C1.4°C | 1.4°C | 66 | 8.0 | 10.911 h |
| March | 12.4°C4.5°C | 4.5°C | 120 | 12.2 | 11.912 h |
| April | 17.2°C9.3°C | 9.3°C | 114 | 11.9 | 13.113 h |
| May | 21.6°C14.3°C | 14.3°C | 131 | 11.6 | 14.014 h |
| June | 24.5°C18.1°C | 18.1°C | 161 | 13.7 | 14.515 h |
| July | 28.2°C22.1°C | 22.1°C | 153 | 13.7 | 14.314 h |
| August | 29.6°C23.5°C | 23.5°C | 112 | 11.8 | 13.514 h |
| September | 26.0°C20.5°C | 20.5°C | 175 | 14.2 | 12.412 h |
| October | 20.7°C15.0°C | 15.0°C | 207 | 12.9 | 11.311 h |
| November | 15.7°C9.3°C | 9.3°C | 98 | 10.1 | 10.310 h |
| December | 10.7°C3.8°C | 3.8°C | 63 | 7.7 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Narashino in JanuaryJapan · 10 kmHigh 8.4°C · Low 0.9°C · 69 mm rain
- Sakura in JanuaryJapan · 10 kmHigh 8.4°C · Low 1.2°C · 74 mm rain
- Inzai in JanuaryJapan · 12 kmHigh 8.2°C · Low 0.2°C · 74 mm rain
- Kamagaya in JanuaryJapan · 12 kmHigh 8.2°C · Low -0.1°C · 69 mm rain
- Chiba in JanuaryJapan · 15 kmHigh 8.7°C · Low 1.9°C · 86 mm rain
- Narita in JanuaryJapan · 18 kmHigh 8.3°C · Low 0.1°C · 74 mm rain
- Toride in JanuaryJapan · 19 kmHigh 8.4°C · Low -0.6°C · 60 mm rain
- Ryūgasaki in JanuaryJapan · 19 kmHigh 8.4°C · Low -0.6°C · 66 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Yachiyo) is explained once on the Yachiyo year overview and on the Sources, method and limits page.
Matsudo, Kashiwa and Nagareyama lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.