Piran weather in December
In December, Piran sees average daytime highs of 10°C and overnight lows near 8°C, with 116 mm of precipitation across 11.3 wet days and about 8.6 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 11°C in the first days to 9°C by the end. The sky is clear or mostly clear about 31% of the time in December, and the air most often feels dry.
Daylight stretches from about 8 h 48 min at the start of December to 8 h 36 min by month's end. Set against the rest of the year, December is Piran's 11th-clearest and 2nd-windiest month. For the whole year in context, see Piran's year-round climate.
- Daytime high
- 10°
- 10th warmest
- Overnight low
- 8°
- 3rd coldest
- Precipitation
- 116 mm
- 11.3 wet days
- Daylight
- 8 h 30 min
- 7:46 AM – 4:18 PM
- Cloud cover
- 60%
- 11th clearest
- Wind
- 15 km/h
- 2nd windiest
- Solar energy
- 1.2 kWh/m²
- Travel score
- 2.3
- out of 10
Piran is coastal town of Slovenia.
- Density
- 94/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 11°C in the first days to 9°C by the end.
A typical December day in Piran reaches about 10°C in the afternoon and slips back to 8°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 13°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°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) | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Avg low (°C) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 12 | 9 |
| 2 | 11 | 9 |
| 3 | 11 | 9 |
| 4 | 11 | 9 |
| 5 | 11 | 9 |
| 6 | 11 | 9 |
| 7 | 11 | 9 |
| 8 | 11 | 9 |
| 9 | 11 | 9 |
| 10 | 11 | 8 |
| 11 | 10 | 8 |
| 12 | 10 | 8 |
| 13 | 10 | 8 |
| 14 | 10 | 8 |
| 15 | 10 | 8 |
| 16 | 10 | 8 |
| 17 | 10 | 8 |
| 18 | 10 | 8 |
| 19 | 10 | 8 |
| 20 | 10 | 8 |
| 21 | 10 | 8 |
| 22 | 10 | 7 |
| 23 | 10 | 7 |
| 24 | 9 | 7 |
| 25 | 9 | 7 |
| 26 | 9 | 7 |
| 27 | 9 | 7 |
| 28 | 9 | 7 |
| 29 | 9 | 7 |
| 30 | 9 | 7 |
| 31 | 9 | 7 |
Piran weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 9° / 6° | 83 | 9.9 | 0.1 | 8.9 | 1.7 |
| Feb | 9° / 6° | 85 | 8.9 | 0.6 | 10.1 | 1.7 |
| Mar | 11° / 8° | 75 | 8.4 | 0.3 | 11.6 | 2.8 |
| Apr | 14° / 12° | 75 | 9.3 | 0 | 13.2 | 4.3 |
| May | 19° / 16° | 82 | 9.3 | 0 | 14.7 | 6.3 |
| Jun | 23° / 21° | 64 | 7.3 | 0 | 15.4 | 7.6 |
| Jul | 26° / 23° | 47 | 5.6 | 0 | 15.1 | 7.9 |
| Aug | 26° / 23° | 78 | 7 | 0 | 13.9 | 7.7 |
| Sep | 22° / 19° | 142 | 9.6 | 0 | 12.3 | 6.9 |
| Oct | 18° / 16° | 141 | 12.3 | 0 | 10.7 | 5.7 |
| Nov | 14° / 12° | 170 | 13.9 | 0.1 | 9.3 | 3.6 |
| Dec | 10° / 8° | 116 | 11.3 | 0.4 | 8.6 | 2.3 |
Cloud cover in December
The sky is clear or mostly clear about 31% 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 57%.
| 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 (%) | 41 | 41 | 42 | 42 | 42 | 42 | 43 | 43 | 44 | 44 | 43 | 44 | 44 | 44 | 44 | 44 | 44 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 43 | 44 | 44 | 45 | 44 | 44 |
| Cloudier (%) | 59 | 59 | 58 | 58 | 58 | 58 | 57 | 57 | 56 | 56 | 57 | 56 | 56 | 56 | 56 | 56 | 56 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 56 | 56 | 55 | 56 | 56 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 41 | 59 |
| 2 | 41 | 59 |
| 3 | 42 | 58 |
| 4 | 42 | 58 |
| 5 | 42 | 58 |
| 6 | 42 | 58 |
| 7 | 43 | 57 |
| 8 | 43 | 57 |
| 9 | 44 | 56 |
| 10 | 44 | 56 |
| 11 | 43 | 57 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 44 | 56 |
| 15 | 44 | 56 |
| 16 | 44 | 56 |
| 17 | 44 | 56 |
| 18 | 42 | 58 |
| 19 | 42 | 58 |
| 20 | 42 | 58 |
| 21 | 42 | 58 |
| 22 | 42 | 58 |
| 23 | 43 | 57 |
| 24 | 43 | 57 |
| 25 | 43 | 57 |
| 26 | 43 | 57 |
| 27 | 44 | 56 |
| 28 | 44 | 56 |
| 29 | 45 | 55 |
| 30 | 44 | 56 |
| 31 | 44 | 56 |
Chance of precipitation in December
Piran gets around 116 mm of rain and snow over 11.3 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 37% and peaks near 40% on the wettest days, and about 0 day brings 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 (%) | 40 | 39 | 39 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 |
| Snow chance (%) | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 40 | 0 |
| 2 | 39 | 0 |
| 3 | 39 | 0 |
| 4 | 38 | 0 |
| 5 | 38 | 0 |
| 6 | 38 | 1 |
| 7 | 37 | 1 |
| 8 | 37 | 1 |
| 9 | 37 | 1 |
| 10 | 37 | 1 |
| 11 | 37 | 1 |
| 12 | 37 | 1 |
| 13 | 36 | 2 |
| 14 | 36 | 2 |
| 15 | 37 | 2 |
| 16 | 37 | 2 |
| 17 | 37 | 2 |
| 18 | 37 | 2 |
| 19 | 37 | 2 |
| 20 | 37 | 2 |
| 21 | 37 | 2 |
| 22 | 37 | 2 |
| 23 | 37 | 2 |
| 24 | 37 | 2 |
| 25 | 37 | 2 |
| 26 | 37 | 2 |
| 27 | 37 | 2 |
| 28 | 36 | 1 |
| 29 | 36 | 1 |
| 30 | 36 | 1 |
| 31 | 36 | 1 |
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 (%) | 98 | 98 | 98 | 99 | 99 | 99 | 99 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Comfortable (%) | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 98 | 2 |
| 2 | 98 | 2 |
| 3 | 98 | 2 |
| 4 | 99 | 1 |
| 5 | 99 | 1 |
| 6 | 99 | 1 |
| 7 | 99 | 1 |
| 8 | 99 | 1 |
| 9 | 100 | 0 |
| 10 | 100 | 0 |
| 11 | 100 | 0 |
| 12 | 100 | 0 |
| 13 | 100 | 0 |
| 14 | 100 | 0 |
| 15 | 100 | 0 |
| 16 | 100 | 0 |
| 17 | 100 | 0 |
| 18 | 100 | 0 |
| 19 | 100 | 0 |
| 20 | 100 | 0 |
| 21 | 100 | 0 |
| 22 | 100 | 0 |
| 23 | 100 | 0 |
| 24 | 100 | 0 |
| 25 | 100 | 0 |
| 26 | 100 | 0 |
| 27 | 100 | 0 |
| 28 | 100 | 0 |
| 29 | 100 | 0 |
| 30 | 100 | 0 |
| 31 | 100 | 0 |
Wind in December
Winds average 15 km/h in December.
Across December, daily wind ranges from about 14 km/h on the calmest days to 16 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) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 |
| 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 | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 16 | light breeze |
| 2 | 16 | light breeze |
| 3 | 16 | light breeze |
| 4 | 16 | light breeze |
| 5 | 16 | light breeze |
| 6 | 16 | light breeze |
| 7 | 16 | light breeze |
| 8 | 16 | light breeze |
| 9 | 15 | light breeze |
| 10 | 15 | light breeze |
| 11 | 15 | light breeze |
| 12 | 15 | light breeze |
| 13 | 15 | light breeze |
| 14 | 15 | light breeze |
| 15 | 15 | light breeze |
| 16 | 15 | light breeze |
| 17 | 15 | light breeze |
| 18 | 15 | light breeze |
| 19 | 15 | light breeze |
| 20 | 15 | light breeze |
| 21 | 15 | light breeze |
| 22 | 15 | light breeze |
| 23 | 15 | light breeze |
| 24 | 15 | light breeze |
| 25 | 15 | light breeze |
| 26 | 15 | light breeze |
| 27 | 15 | light breeze |
| 28 | 15 | light breeze |
| 29 | 15 | light breeze |
| 30 | 14 | light breeze |
| 31 | 14 | light breeze |
Sunrise & sunset in December
Daylight runs from about 8 h 48 min at the start of December to 8 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 12 minutes over December. Sunrise moves from 7:32 AM to 7:52 AM, and sunset from 4:19 PM to 4:26 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) | 8.8 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.6 | 8.6 | 8.6 | 8.6 | 8.6 | 8.6 | 8.6 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.6 |
| Sunrise (AM) | 7:32 | 7:33 | 7:34 | 7:36 | 7:37 | 7:38 | 7:39 | 7:40 | 7:40 | 7:41 | 7:42 | 7:43 | 7:44 | 7:45 | 7:45 | 7:46 | 7:47 | 7:47 | 7:48 | 7:49 | 7:49 | 7:50 | 7:50 | 7:50 | 7:51 | 7:51 | 7:51 | 7:52 | 7:52 | 7:52 | 7:52 |
| Sunset (PM) | 4:19 | 4:18 | 4:18 | 4:18 | 4:18 | 4:17 | 4:17 | 4:17 | 4:17 | 4:17 | 4:17 | 4:17 | 4:17 | 4:17 | 4:18 | 4:18 | 4:18 | 4:18 | 4:19 | 4:19 | 4:19 | 4:20 | 4:20 | 4:21 | 4:21 | 4:22 | 4:23 | 4:23 | 4:24 | 4:25 | 4:26 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 8.8 | 7:32 | 4:19 |
| 2 | 8.7 | 7:33 | 4:18 |
| 3 | 8.7 | 7:34 | 4:18 |
| 4 | 8.7 | 7:36 | 4:18 |
| 5 | 8.7 | 7:37 | 4:18 |
| 6 | 8.7 | 7:38 | 4:17 |
| 7 | 8.6 | 7:39 | 4:17 |
| 8 | 8.6 | 7:40 | 4:17 |
| 9 | 8.6 | 7:40 | 4:17 |
| 10 | 8.6 | 7:41 | 4:17 |
| 11 | 8.6 | 7:42 | 4:17 |
| 12 | 8.6 | 7:43 | 4:17 |
| 13 | 8.6 | 7:44 | 4:17 |
| 14 | 8.5 | 7:45 | 4:17 |
| 15 | 8.5 | 7:45 | 4:18 |
| 16 | 8.5 | 7:46 | 4:18 |
| 17 | 8.5 | 7:47 | 4:18 |
| 18 | 8.5 | 7:47 | 4:18 |
| 19 | 8.5 | 7:48 | 4:19 |
| 20 | 8.5 | 7:49 | 4:19 |
| 21 | 8.5 | 7:49 | 4:19 |
| 22 | 8.5 | 7:50 | 4:20 |
| 23 | 8.5 | 7:50 | 4:20 |
| 24 | 8.5 | 7:50 | 4:21 |
| 25 | 8.5 | 7:51 | 4:21 |
| 26 | 8.5 | 7:51 | 4:22 |
| 27 | 8.5 | 7:51 | 4:23 |
| 28 | 8.5 | 7:52 | 4:23 |
| 29 | 8.5 | 7:52 | 4:24 |
| 30 | 8.5 | 7:52 | 4:25 |
| 31 | 8.6 | 7:52 | 4:26 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 1.2 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 6.52 kWh/m² in July across the year — December's 1.2 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) | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
| 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 | 1.3 | Dim |
| 2 | 1.3 | Dim |
| 3 | 1.3 | Dim |
| 4 | 1.3 | Dim |
| 5 | 1.3 | Dim |
| 6 | 1.3 | Dim |
| 7 | 1.3 | Dim |
| 8 | 1.2 | Dim |
| 9 | 1.2 | Dim |
| 10 | 1.2 | Dim |
| 11 | 1.2 | Dim |
| 12 | 1.2 | Dim |
| 13 | 1.2 | Dim |
| 14 | 1.2 | Dim |
| 15 | 1.2 | Dim |
| 16 | 1.2 | Dim |
| 17 | 1.2 | Dim |
| 18 | 1.2 | Dim |
| 19 | 1.2 | Dim |
| 20 | 1.2 | Dim |
| 21 | 1.2 | Dim |
| 22 | 1.2 | Dim |
| 23 | 1.2 | Dim |
| 24 | 1.2 | Dim |
| 25 | 1.2 | Dim |
| 26 | 1.2 | Dim |
| 27 | 1.2 | Dim |
| 28 | 1.2 | Dim |
| 29 | 1.2 | Dim |
| 30 | 1.2 | Dim |
| 31 | 1.2 | Dim |
Is December a good time to visit Piran?
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 Piran.
What to pack for Piran in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Piran sees daytime highs around 10°C and nights near 8°C. Pack a warm layer. Worth having: rain gear. About 11 days see rain.
Sea temperature near Piran in December
The nearest coast averages about 13°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 25°C and coldest in February near 10°C.
It's comfortable for a long swim from May 31 to Oct 9 — about 4.3 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 10 | 10 | 13 | 18 | 23 | 25 | 25 | 23 | 19 | 16 | 13 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 10 | Bracing |
| Mar | 10 | Bracing |
| Apr | 13 | Bracing |
| May | 18 | Cool |
| Jun | 23 | Refreshing |
| Jul | 25 | Warm |
| Aug | 25 | Warm |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 16 | Cool |
| Dec | 13 | Bracing |
UV index in Piran in December
Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Piran peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 7 | 7 | 8 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 7 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Piran 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 Piran is worst in January — around 22 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 12 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) | 22 | 20 | 20 | 19 | 16 | 16 | 16 | 13 | 12 | 14 | 14 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 22 | Moderate |
| Feb | 20 | Moderate |
| Mar | 20 | Moderate |
| Apr | 19 | Moderate |
| May | 16 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 13 | Moderate |
| Sep | 12 | Moderate |
| Oct | 14 | Moderate |
| Nov | 14 | Moderate |
| Dec | 18 | Moderate |
Where is Piran?
Piran sits at 45.5°N, 13.6°E, 0 m above sea level, in Slovenia. The nearest listed city is Koper, 13 km away.
Topography around Piran
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Piran.
Within 3 km, the terrain around Piran has only modest variations in elevation — a maximum elevation change of 172 m around an average of 10 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 412 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.
The land around Piran is covered by water (82%) within 3 km, water (65%) and trees (20%) within 16 km, and trees (43%) and water (31%) within 80 km.
Slovenia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 63% of US
- price level, 2025
- GDP per capita
- $37,376
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Piran (45.5278°, 13.5706°, elevation 0 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. 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).