Uonuma weather in December
In December, Uonuma sees average daytime highs of 5°C and overnight lows near -2°C, with 271 mm of precipitation across 24 wet days and about 9.5 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 8°C in the first days to 3°C by the end. The sky is clear or mostly clear about 11% of the time in December, and the air most often feels dry.
Daylight stretches from about 9 h 36 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Uonuma's 8th-clearest and 3rd-windiest month. For the whole year in context, see Uonuma's year-round climate.
- Daytime high
- 5°
- 10th warmest
- Overnight low
- -2°
- 3rd coldest
- Precipitation
- 271 mm
- 24 wet days
- Daylight
- 9 h 24 min
- 6:57 AM – 4:24 PM
- Cloud cover
- 73%
- 8th clearest
- Wind
- 8 km/h
- 3rd windiest
- Solar energy
- 1.87 kWh/m²
- Travel score
- 0.2
- out of 10
Uonuma is city in Niigata Prefecture, Japan.
- Density
- 36/km²
- people per km²
- Founded
- 2004
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 8°C in the first days to 3°C by the end.
A typical December day in Uonuma reaches about 5°C in the afternoon and slips back to -2°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 1°C and 10°C. Set against its neighbours, December runs about 7°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) | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 |
| Avg low (°C) | 1 | 1 | 0 | 0 | 0 | 0 | 0 | -1 | -1 | -1 | -1 | -1 | -1 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -3 | -3 | -3 | -3 | -3 | -3 | -3 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 8 | 1 |
| 2 | 8 | 1 |
| 3 | 8 | 0 |
| 4 | 8 | 0 |
| 5 | 7 | 0 |
| 6 | 7 | 0 |
| 7 | 7 | 0 |
| 8 | 7 | -1 |
| 9 | 6 | -1 |
| 10 | 6 | -1 |
| 11 | 6 | -1 |
| 12 | 6 | -1 |
| 13 | 6 | -1 |
| 14 | 5 | -2 |
| 15 | 5 | -2 |
| 16 | 5 | -2 |
| 17 | 5 | -2 |
| 18 | 5 | -2 |
| 19 | 5 | -2 |
| 20 | 4 | -2 |
| 21 | 4 | -2 |
| 22 | 4 | -2 |
| 23 | 4 | -2 |
| 24 | 4 | -2 |
| 25 | 4 | -3 |
| 26 | 4 | -3 |
| 27 | 4 | -3 |
| 28 | 3 | -3 |
| 29 | 3 | -3 |
| 30 | 3 | -3 |
| 31 | 3 | -3 |
How December really feels in Uonuma
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 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.
Uonuma 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 | 2° / -3° | 298 | 26.2 | 24.1 | 9.7 | 0.0 |
| Feb | 3° / -3° | 223 | 22 | 19.8 | 10.6 | 0.0 |
| Mar | 7° / -1° | 201 | 21.6 | 14.8 | 11.7 | 0.6 |
| Apr | 14° / 4° | 143 | 16.4 | 3.6 | 12.9 | 3.4 |
| May | 20° / 10° | 152 | 15 | 0.1 | 14 | 5.5 |
| Jun | 23° / 15° | 178 | 16.6 | 0 | 14.5 | 5.5 |
| Jul | 27° / 20° | 263 | 20.5 | 0 | 14.3 | 4.7 |
| Aug | 28° / 21° | 180 | 17.8 | 0 | 13.4 | 4.9 |
| Sep | 24° / 17° | 190 | 16.6 | 0 | 12.3 | 5.5 |
| Oct | 18° / 10° | 196 | 16.6 | 0 | 11 | 4.9 |
| Nov | 12° / 4° | 192 | 18.8 | 3.9 | 10 | 2.5 |
| Dec | 5° / -2° | 271 | 24 | 17.6 | 9.5 | 0.2 |
Cloud cover in December
The sky is clear or mostly clear about 11% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 77%.
| 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 (%) | 28 | 27 | 27 | 27 | 25 | 25 | 24 | 24 | 24 | 24 | 22 | 22 | 22 | 23 | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 23 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 19 |
| Cloudier (%) | 72 | 73 | 73 | 73 | 75 | 75 | 76 | 76 | 76 | 76 | 78 | 78 | 78 | 77 | 78 | 77 | 77 | 77 | 78 | 78 | 78 | 78 | 77 | 78 | 79 | 79 | 79 | 80 | 80 | 81 | 81 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 28 | 72 |
| 2 | 27 | 73 |
| 3 | 27 | 73 |
| 4 | 27 | 73 |
| 5 | 25 | 75 |
| 6 | 25 | 75 |
| 7 | 24 | 76 |
| 8 | 24 | 76 |
| 9 | 24 | 76 |
| 10 | 24 | 76 |
| 11 | 22 | 78 |
| 12 | 22 | 78 |
| 13 | 22 | 78 |
| 14 | 23 | 77 |
| 15 | 22 | 78 |
| 16 | 23 | 77 |
| 17 | 23 | 77 |
| 18 | 23 | 77 |
| 19 | 22 | 78 |
| 20 | 22 | 78 |
| 21 | 22 | 78 |
| 22 | 22 | 78 |
| 23 | 23 | 77 |
| 24 | 22 | 78 |
| 25 | 21 | 79 |
| 26 | 21 | 79 |
| 27 | 21 | 79 |
| 28 | 20 | 80 |
| 29 | 20 | 80 |
| 30 | 19 | 81 |
| 31 | 19 | 81 |
Chance of precipitation in December
Uonuma gets around 271 mm of rain and snow over 24 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 77% and peaks near 83% on the wettest days, and about 18 days bring snow. The odds climb toward the end of the month.
| 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 (%) | 70 | 71 | 72 | 73 | 74 | 74 | 75 | 76 | 76 | 76 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 79 | 79 | 80 | 80 | 81 | 81 | 82 | 82 | 83 |
| Snow chance (%) | 32 | 34 | 36 | 39 | 41 | 43 | 45 | 48 | 50 | 52 | 53 | 55 | 56 | 57 | 58 | 59 | 59 | 60 | 61 | 62 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 72 | 73 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 70 | 32 |
| 2 | 71 | 34 |
| 3 | 72 | 36 |
| 4 | 73 | 39 |
| 5 | 74 | 41 |
| 6 | 74 | 43 |
| 7 | 75 | 45 |
| 8 | 76 | 48 |
| 9 | 76 | 50 |
| 10 | 76 | 52 |
| 11 | 77 | 53 |
| 12 | 77 | 55 |
| 13 | 77 | 56 |
| 14 | 77 | 57 |
| 15 | 77 | 58 |
| 16 | 77 | 59 |
| 17 | 77 | 59 |
| 18 | 77 | 60 |
| 19 | 77 | 61 |
| 20 | 78 | 62 |
| 21 | 78 | 62 |
| 22 | 78 | 63 |
| 23 | 79 | 64 |
| 24 | 79 | 65 |
| 25 | 80 | 66 |
| 26 | 80 | 67 |
| 27 | 81 | 68 |
| 28 | 81 | 69 |
| 29 | 82 | 70 |
| 30 | 82 | 72 |
| 31 | 83 | 73 |
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 8 km/h in December.
Across December, daily wind ranges from about 7 km/h on the calmest days to 9 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) | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
| 31 | 9 | calm |
Sunrise & sunset in December
Daylight runs from about 9 h 36 min at the start of December to 9 h 30 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 6:45 AM to 7:03 AM, and sunset from 4:23 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) | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.5 | 9.5 | 9.5 | 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 | 9.5 | 9.5 | 9.5 |
| Sunrise (AM) | 6:45 | 6:46 | 6:47 | 6:48 | 6:49 | 6:50 | 6:50 | 6:51 | 6:52 | 6:53 | 6:53 | 6:54 | 6:55 | 6:56 | 6:56 | 6:57 | 6:57 | 6:58 | 6:59 | 6:59 | 7:00 | 7:00 | 7:01 | 7:01 | 7:01 | 7:02 | 7:02 | 7:02 | 7:03 | 7:03 | 7:03 |
| Sunset (PM) | 4:23 | 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 | 4:24 | 4:25 | 4:25 | 4:26 | 4:26 | 4:27 | 4:27 | 4:28 | 4:28 | 4:29 | 4:29 | 4:30 | 4:31 | 4:31 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.6 | 6:45 | 4:23 |
| 2 | 9.6 | 6:46 | 4:22 |
| 3 | 9.6 | 6:47 | 4:22 |
| 4 | 9.6 | 6:48 | 4:22 |
| 5 | 9.6 | 6:49 | 4:22 |
| 6 | 9.5 | 6:50 | 4:22 |
| 7 | 9.5 | 6:50 | 4:22 |
| 8 | 9.5 | 6:51 | 4:22 |
| 9 | 9.5 | 6:52 | 4:22 |
| 10 | 9.5 | 6:53 | 4:23 |
| 11 | 9.5 | 6:53 | 4:23 |
| 12 | 9.5 | 6:54 | 4:23 |
| 13 | 9.5 | 6:55 | 4:23 |
| 14 | 9.5 | 6:56 | 4:23 |
| 15 | 9.5 | 6:56 | 4:24 |
| 16 | 9.4 | 6:57 | 4:24 |
| 17 | 9.4 | 6:57 | 4:24 |
| 18 | 9.4 | 6:58 | 4:24 |
| 19 | 9.4 | 6:59 | 4:25 |
| 20 | 9.4 | 6:59 | 4:25 |
| 21 | 9.4 | 7:00 | 4:26 |
| 22 | 9.4 | 7:00 | 4:26 |
| 23 | 9.4 | 7:01 | 4:27 |
| 24 | 9.4 | 7:01 | 4:27 |
| 25 | 9.4 | 7:01 | 4:28 |
| 26 | 9.4 | 7:02 | 4:28 |
| 27 | 9.4 | 7:02 | 4:29 |
| 28 | 9.4 | 7:02 | 4:29 |
| 29 | 9.5 | 7:03 | 4:30 |
| 30 | 9.5 | 7:03 | 4:31 |
| 31 | 9.5 | 7:03 | 4:31 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 1.87 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 1.87 kWh/m² to a high of 5.55 kWh/m² in May across the year — December's 1.87 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) | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 | 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 | 1.9 | Dim |
| 2 | 1.9 | Dim |
| 3 | 1.9 | Dim |
| 4 | 1.9 | Dim |
| 5 | 1.9 | Dim |
| 6 | 1.9 | Dim |
| 7 | 1.9 | Dim |
| 8 | 1.9 | Dim |
| 9 | 1.9 | Dim |
| 10 | 1.9 | Dim |
| 11 | 1.9 | Dim |
| 12 | 1.9 | Dim |
| 13 | 1.9 | Dim |
| 14 | 1.9 | Dim |
| 15 | 1.9 | Dim |
| 16 | 1.9 | Dim |
| 17 | 1.9 | Dim |
| 18 | 1.9 | Dim |
| 19 | 1.9 | Dim |
| 20 | 1.9 | Dim |
| 21 | 1.9 | Dim |
| 22 | 1.9 | Dim |
| 23 | 1.9 | Dim |
| 24 | 1.9 | Dim |
| 25 | 1.9 | Dim |
| 26 | 1.9 | Dim |
| 27 | 1.9 | Dim |
| 28 | 1.9 | Dim |
| 29 | 1.9 | Dim |
| 30 | 1.9 | Dim |
| 31 | 1.9 | Dim |
Hazard calendar for Uonuma
In December, Uonuma sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Uonuma sits in the Pacific typhoon belt; the season peaks July–October.
Is December a good time to visit Uonuma?
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 Uonuma.
What to pack for Uonuma in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Uonuma sees daytime highs around 5°C and nights near -2°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 24 days see rain.
Sea temperature near Uonuma 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 at the nearest coast (about 33 km away) is warmest in August at about 27°C and coldest in March near 10°C.
It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 12 | 11 | 10 | 11 | 15 | 20 | 23 | 27 | 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 | 11 | Bracing |
| Mar | 10 | Bracing |
| Apr | 11 | Bracing |
| May | 15 | Bracing |
| Jun | 20 | Cool |
| Jul | 23 | Refreshing |
| Aug | 27 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 18 | Cool |
| Dec | 15 | Cool |
UV index in Uonuma 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 Uonuma peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 7 | 8 | 9 | 10 | 10 | 8 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Uonuma 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 Uonuma is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 10 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) | 12 | 15 | 22 | 23 | 22 | 19 | 17 | 14 | 12 | 12 | 11 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Good |
| Feb | 15 | Moderate |
| Mar | 22 | Moderate |
| Apr | 23 | Moderate |
| May | 22 | Moderate |
| Jun | 19 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 12 | Moderate |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Uonuma?
Uonuma sits at 37.2°N, 139.0°E, 95 m above sea level, in Japan. The nearest listed city is Ojiya, 16 km away.
Topography around Uonuma
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Uonuma.
Within 3 km, the terrain around Uonuma has significant variations in elevation — a maximum elevation change of 251 m around an average of 138 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,713 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,554 m.
The land around Uonuma is covered by trees (43%), cropland (29%) and artificial surfaces (21%) within 3 km, trees (82%) within 16 km, and trees (70%) 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 Uonuma (37.2449°, 138.9623°, elevation 95 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).