Ryōtsu-minato weather in December
In December, Ryōtsu-minato sees average daytime highs of 8°C and overnight lows near 5°C, with 154 mm of precipitation across 21.6 wet days and about 9.4 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 10°C in the first days to 7°C by the end. The sky is clear or mostly clear about 9% of the time in December, and the air most often feels dry.
Daylight stretches from about 9 h 30 min at the start of December to 9 h 24 min by month's end. Set against the rest of the year, December is Ryōtsu-minato's 10th-clearest and 2nd-windiest month. For the whole year in context, see Ryōtsu-minato's year-round climate.
- Daytime high
- 8°
- 10th warmest
- Overnight low
- 5°
- 4th coldest
- Precipitation
- 154 mm
- 21.6 wet days
- Daylight
- 9 h 24 min
- 7:01 AM – 4:23 PM
- Cloud cover
- 71%
- 10th clearest
- Wind
- 20 km/h
- 2nd windiest
- Solar energy
- 1.73 kWh/m²
- Travel score
- 1.1
- out of 10
Temperature in December
Highs ease over the month, from about 10°C in the first days to 7°C by the end.
A typical December day in Ryōtsu-minato reaches about 8°C in the afternoon and slips back to 5°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 12°C. Set against its neighbours, December runs about 5°C cooler than November and about 3°C warmer than January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Avg low (°C) | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 11 | 7 |
| 2 | 11 | 7 |
| 3 | 10 | 7 |
| 4 | 10 | 6 |
| 5 | 10 | 6 |
| 6 | 10 | 6 |
| 7 | 10 | 6 |
| 8 | 9 | 6 |
| 9 | 9 | 6 |
| 10 | 9 | 6 |
| 11 | 9 | 5 |
| 12 | 9 | 5 |
| 13 | 9 | 5 |
| 14 | 8 | 5 |
| 15 | 8 | 5 |
| 16 | 8 | 5 |
| 17 | 8 | 5 |
| 18 | 8 | 5 |
| 19 | 8 | 5 |
| 20 | 8 | 4 |
| 21 | 8 | 4 |
| 22 | 8 | 4 |
| 23 | 7 | 4 |
| 24 | 7 | 4 |
| 25 | 7 | 4 |
| 26 | 7 | 4 |
| 27 | 7 | 4 |
| 28 | 7 | 4 |
| 29 | 7 | 4 |
| 30 | 7 | 4 |
| 31 | 7 | 4 |
How December really feels in Ryōtsu-minato
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 9 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is cold — wind chill drags the overnight "feels like" below the raw low.
Ryōtsu-minato weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 6° / 3° | 132 | 21.4 | 9.8 | 9.7 | 0.2 |
| Feb | 6° / 2° | 91 | 17.6 | 8.2 | 10.5 | 0.3 |
| Mar | 9° / 4° | 101 | 16.2 | 3.3 | 11.7 | 1.4 |
| Apr | 13° / 8° | 89 | 12.2 | 0.2 | 13 | 3.5 |
| May | 18° / 13° | 92 | 11 | 0 | 14 | 5.8 |
| Jun | 22° / 18° | 124 | 10.5 | 0 | 14.6 | 6.4 |
| Jul | 26° / 22° | 205 | 14.3 | 0 | 14.4 | 5.8 |
| Aug | 28° / 24° | 146 | 12.1 | 0 | 13.5 | 5.6 |
| Sep | 25° / 21° | 142 | 12.5 | 0 | 12.3 | 6.2 |
| Oct | 19° / 15° | 136 | 13.2 | 0 | 11 | 5.7 |
| Nov | 14° / 10° | 137 | 17.3 | 0.1 | 9.9 | 3.3 |
| Dec | 8° / 5° | 154 | 21.6 | 4.8 | 9.4 | 1.1 |
Cloud cover in December
The sky is clear or mostly clear about 9% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 69%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 34 | 33 | 32 | 31 | 31 | 31 | 30 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 |
| Cloudier (%) | 66 | 67 | 68 | 69 | 69 | 69 | 70 | 71 | 71 | 71 | 71 | 72 | 71 | 71 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 68 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 69 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 34 | 66 |
| 2 | 33 | 67 |
| 3 | 32 | 68 |
| 4 | 31 | 69 |
| 5 | 31 | 69 |
| 6 | 31 | 69 |
| 7 | 30 | 70 |
| 8 | 29 | 71 |
| 9 | 29 | 71 |
| 10 | 29 | 71 |
| 11 | 29 | 71 |
| 12 | 28 | 72 |
| 13 | 29 | 71 |
| 14 | 29 | 71 |
| 15 | 30 | 70 |
| 16 | 30 | 70 |
| 17 | 30 | 70 |
| 18 | 31 | 69 |
| 19 | 31 | 69 |
| 20 | 31 | 69 |
| 21 | 31 | 69 |
| 22 | 32 | 68 |
| 23 | 32 | 68 |
| 24 | 32 | 68 |
| 25 | 32 | 68 |
| 26 | 31 | 69 |
| 27 | 31 | 69 |
| 28 | 31 | 69 |
| 29 | 31 | 69 |
| 30 | 31 | 69 |
| 31 | 31 | 69 |
Chance of precipitation in December
Ryōtsu-minato gets around 154 mm of rain and snow over 21.6 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 70% and peaks near 72% on the wettest days, and about 5 days bring snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 67 | 68 | 68 | 69 | 70 | 70 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 69 | 69 | 69 | 69 | 69 |
| Snow chance (%) | 4 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 16 | 17 | 17 | 18 | 19 | 19 | 19 | 20 | 20 | 20 | 21 | 21 | 21 | 22 | 22 | 23 | 23 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 67 | 4 |
| 2 | 68 | 5 |
| 3 | 68 | 6 |
| 4 | 69 | 6 |
| 5 | 70 | 7 |
| 6 | 70 | 8 |
| 7 | 71 | 9 |
| 8 | 71 | 10 |
| 9 | 71 | 11 |
| 10 | 72 | 12 |
| 11 | 72 | 13 |
| 12 | 72 | 14 |
| 13 | 72 | 15 |
| 14 | 72 | 16 |
| 15 | 72 | 16 |
| 16 | 71 | 17 |
| 17 | 71 | 17 |
| 18 | 71 | 18 |
| 19 | 71 | 19 |
| 20 | 70 | 19 |
| 21 | 70 | 19 |
| 22 | 70 | 20 |
| 23 | 69 | 20 |
| 24 | 69 | 20 |
| 25 | 69 | 21 |
| 26 | 69 | 21 |
| 27 | 69 | 21 |
| 28 | 69 | 22 |
| 29 | 69 | 22 |
| 30 | 69 | 23 |
| 31 | 69 | 23 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in December
Winds average 20 km/h in December.
Across December, daily wind ranges from about 18 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 18 | light breeze |
| 2 | 18 | light breeze |
| 3 | 18 | light breeze |
| 4 | 18 | light breeze |
| 5 | 18 | light breeze |
| 6 | 18 | light breeze |
| 7 | 19 | light breeze |
| 8 | 19 | light breeze |
| 9 | 19 | light breeze |
| 10 | 19 | light breeze |
| 11 | 19 | light breeze |
| 12 | 19 | light breeze |
| 13 | 19 | light breeze |
| 14 | 19 | light breeze |
| 15 | 19 | light breeze |
| 16 | 20 | light breeze |
| 17 | 20 | light breeze |
| 18 | 20 | light breeze |
| 19 | 20 | light breeze |
| 20 | 20 | breezy |
| 21 | 20 | breezy |
| 22 | 20 | breezy |
| 23 | 21 | breezy |
| 24 | 21 | breezy |
| 25 | 21 | breezy |
| 26 | 21 | breezy |
| 27 | 21 | breezy |
| 28 | 21 | breezy |
| 29 | 21 | breezy |
| 30 | 21 | breezy |
| 31 | 21 | breezy |
Sunrise & sunset in December
Daylight runs from about 9 h 30 min at the start of December to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over December. Sunrise moves from 6:50 AM to 7:08 AM, and sunset from 4:22 PM to 4:31 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 |
| Sunrise (AM) | 6:50 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 | 6:55 | 6:56 | 6:56 | 6:57 | 6:58 | 6:59 | 6:59 | 7:00 | 7:01 | 7:01 | 7:02 | 7:03 | 7:03 | 7:04 | 7:04 | 7:05 | 7:05 | 7:06 | 7:06 | 7:06 | 7:07 | 7:07 | 7:07 | 7:07 | 7:08 |
| Sunset (PM) | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:22 | 4:23 | 4:23 | 4:23 | 4:23 | 4:23 | 4:24 | 4:24 | 4:24 | 4:25 | 4:25 | 4:26 | 4:26 | 4:27 | 4:27 | 4:28 | 4:28 | 4:29 | 4:30 | 4:30 | 4:31 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.5 | 6:50 | 4:22 |
| 2 | 9.5 | 6:50 | 4:22 |
| 3 | 9.5 | 6:51 | 4:22 |
| 4 | 9.5 | 6:52 | 4:22 |
| 5 | 9.5 | 6:53 | 4:22 |
| 6 | 9.5 | 6:54 | 4:22 |
| 7 | 9.5 | 6:55 | 4:22 |
| 8 | 9.4 | 6:56 | 4:22 |
| 9 | 9.4 | 6:56 | 4:22 |
| 10 | 9.4 | 6:57 | 4:22 |
| 11 | 9.4 | 6:58 | 4:22 |
| 12 | 9.4 | 6:59 | 4:23 |
| 13 | 9.4 | 6:59 | 4:23 |
| 14 | 9.4 | 7:00 | 4:23 |
| 15 | 9.4 | 7:01 | 4:23 |
| 16 | 9.4 | 7:01 | 4:23 |
| 17 | 9.4 | 7:02 | 4:24 |
| 18 | 9.4 | 7:03 | 4:24 |
| 19 | 9.4 | 7:03 | 4:24 |
| 20 | 9.4 | 7:04 | 4:25 |
| 21 | 9.4 | 7:04 | 4:25 |
| 22 | 9.4 | 7:05 | 4:26 |
| 23 | 9.4 | 7:05 | 4:26 |
| 24 | 9.4 | 7:06 | 4:27 |
| 25 | 9.4 | 7:06 | 4:27 |
| 26 | 9.4 | 7:06 | 4:28 |
| 27 | 9.4 | 7:07 | 4:28 |
| 28 | 9.4 | 7:07 | 4:29 |
| 29 | 9.4 | 7:07 | 4:30 |
| 30 | 9.4 | 7:07 | 4:30 |
| 31 | 9.4 | 7:08 | 4:31 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 1.73 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 5.85 kWh/m² in May across the year — December's 1.73 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.9 | 1.9 |
| Level | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.8 | Dim |
| 2 | 1.8 | Dim |
| 3 | 1.8 | Dim |
| 4 | 1.8 | Dim |
| 5 | 1.8 | Dim |
| 6 | 1.8 | Dim |
| 7 | 1.7 | Dim |
| 8 | 1.7 | Dim |
| 9 | 1.7 | Dim |
| 10 | 1.7 | Dim |
| 11 | 1.7 | Dim |
| 12 | 1.7 | Dim |
| 13 | 1.7 | Dim |
| 14 | 1.7 | Dim |
| 15 | 1.7 | Dim |
| 16 | 1.7 | Dim |
| 17 | 1.7 | Dim |
| 18 | 1.7 | Dim |
| 19 | 1.7 | Dim |
| 20 | 1.8 | Dim |
| 21 | 1.8 | Dim |
| 22 | 1.8 | Dim |
| 23 | 1.8 | Dim |
| 24 | 1.8 | Dim |
| 25 | 1.8 | Dim |
| 26 | 1.8 | Dim |
| 27 | 1.8 | Dim |
| 28 | 1.8 | Dim |
| 29 | 1.8 | Dim |
| 30 | 1.9 | Dim |
| 31 | 1.9 | Dim |
Hazard calendar for Ryōtsu-minato
In December, Ryōtsu-minato sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Ryōtsu-minato sits in the Pacific typhoon belt; the season peaks July–October.
Is December a good time to visit Ryōtsu-minato?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a weaker month for outdoor sightseeing in Ryōtsu-minato.
What to pack for Ryōtsu-minato in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Ryōtsu-minato sees daytime highs around 8°C and nights near 5°C. Pack a warm layer and rain gear. About 22 days see rain.
Sea temperature near Ryōtsu-minato in December
The nearest coast averages about 15°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 26°C and coldest in March near 10°C.
It's comfortable for a long swim from Jun 24 to Oct 29 — about 4.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 12 | 10 | 10 | 11 | 14 | 19 | 23 | 26 | 25 | 22 | 18 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 12 | Bracing |
| Feb | 10 | Bracing |
| Mar | 10 | Bracing |
| Apr | 11 | Bracing |
| May | 14 | Bracing |
| Jun | 19 | Cool |
| Jul | 23 | Refreshing |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 18 | Cool |
| Dec | 15 | Cool |
UV index in Ryōtsu-minato in December
Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ryōtsu-minato peaks around August 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 8 | 8 | 9 | 10 | 8 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Ryōtsu-minato in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Ryōtsu-minato is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 14 | 20 | 20 | 18 | 14 | 12 | 10 | 9 | 9 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 20 | Moderate |
| Apr | 20 | Moderate |
| May | 18 | Moderate |
| Jun | 14 | Moderate |
| Jul | 12 | Moderate |
| Aug | 10 | Good |
| Sep | 9 | Good |
| Oct | 9 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Ryōtsu-minato?
Ryōtsu-minato sits at 38.1°N, 138.4°E, 4 m above sea level, in Japan. The nearest listed city is Sado, 9.0 km away.
Topography around Ryōtsu-minato
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ryōtsu-minato.
Within 3 km, the terrain around Ryōtsu-minato has only modest variations in elevation — a maximum elevation change of 102 m around an average of 11 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,155 m; within 80 km, large variations in elevation — a maximum elevation change of 1,125 m.
The land around Ryōtsu-minato is covered by water (50%) and trees (23%) within 3 km, trees (55%) and water (34%) within 16 km, and water (78%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ryōtsu-minato (38.0782°, 138.4394°, elevation 4 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).