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The average temperature in Hatoyama over the whole year is 16°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 0°C. The rainy (wet) season in Hatoyama runs from March to October, peaking in June with a 27% chance of rain on a given day. The dry season is November to February; December is the driest month, at 9%. Winds in Hatoyama are highest in April, averaging 2.8 m/s (10 km/h), and lightest in September, at 2.1 m/s (8 km/h). The prevailing wind is from the NE. The clearest skies in Hatoyama come in January, when the sky is typically 38% covered; September is the cloudiest month, at 69%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 8°C | 0°C | 3°C | 10% | 38% | 2.4 m/s | 0 | 0 | 26 |
| February | 9°C | 2°C | 4°C | 11% | 45% | 2.7 m/s | 2 | 0 | 32 |
| March | 13°C | 5°C | 9°C | 20% | 52% | 2.7 m/s | 17 | 0 | 61 |
| April | 18°C | 10°C | 15°C | 20% | 57% | 2.8 m/s | 53 | 4 | 77 |
| May | 23°C | 15°C | 21°C | 21% | 62% | 2.5 m/s | 79 | 21 | 59 |
| June | 25°C | 20°C | 26°C | 27% | 68% | 2.3 m/s | 58 | 48 | 25 |
| July | 29°C | 24°C | 32°C | 26% | 66% | 2.2 m/s | 16 | 40 | 5 |
| August | 31°C | 25°C | 34°C | 24% | 66% | 2.3 m/s | 9 | 30 | 2 |
| September | 26°C | 21°C | 28°C | 25% | 69% | 2.1 m/s | 42 | 50 | 17 |
| October | 20°C | 15°C | 20°C | 22% | 63% | 2.1 m/s | 71 | 17 | 65 |
| November | 16°C | 8°C | 13°C | 12% | 50% | 2.1 m/s | 40 | 0 | 82 |
| December | 11°C | 3°C | 7°C | 9% | 41% | 2.2 m/s | 3 | 0 | 49 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Year round, Hatoyama has days of about 8°C at their warmest in January, its coolest month, and 31°C in August, its warmest; the coolest hours of the day run from 0°C to 25°C through the year, and the average temperature over the year is 16°C around the clock. Rain is most likely around June and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Winter in Hatoyama has typical daily highs of about 9°C and lows of about 2°C, with a 10% chance of rain on a given day.
Spring in Hatoyama has typical daily highs of about 18°C and lows of about 10°C, with a 20% chance of rain on a given day.
Summer in Hatoyama has typical daily highs of about 28°C and lows of about 23°C, with a 25% chance of rain on a given day.
Autumn in Hatoyama has typical daily highs of about 21°C and lows of about 15°C, with a 20% chance of rain on a given day.
The rainy (wet) season in Hatoyama runs from March to October, peaking in June with a 27% chance of rain on a given day. The dry season is November to February; December is the driest month, at 9%.
Winds in Hatoyama are highest in April, averaging 2.8 m/s (10 km/h), and lightest in September, at 2.1 m/s (8 km/h). The prevailing wind is from the NE.
The average temperature in Hatoyama over the whole year is 16°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 0°C.