Biella weather in April
In April, Biella sees average daytime highs of 16°C and overnight lows near 7°C, with 144 mm of precipitation across 13.5 wet days and about 13.3 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.
Highs climb over the month, from about 14°C in the first days to 17°C by the end. The sky is clear or mostly clear about 32% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 30 min at the start of April to 14 hours by month's end. Set against the rest of the year, April is Biella's 9th-clearest and 1st-windiest month. For the whole year in context, see Biella's year-round climate.
- Daytime high
- 16°
- 6th warmest
- Overnight low
- 7°
- 6th coldest
- Precipitation
- 144 mm
- 13.5 wet days
- Daylight
- 13 h 18 min
- 5:49 AM – 7:07 PM
- Cloud cover
- 59%
- 9th clearest
- Wind
- 5 km/h
- 1st windiest
- Solar energy
- 4.73 kWh/m²
- Travel score
- 4.4
- out of 10
- Air quality
- Moderate
- PM2.5 10.3 µg/m³ · 2019
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 14°C in the first days to 17°C by the end.
A typical April day in Biella reaches about 16°C in the afternoon and slips back to 7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 21°C. Set against its neighbours, April runs about 4°C warmer than March and about 4°C cooler than May.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 |
| Avg low (°C) | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 14 | 5 |
| 2 | 14 | 5 |
| 3 | 14 | 5 |
| 4 | 14 | 5 |
| 5 | 14 | 5 |
| 6 | 15 | 6 |
| 7 | 15 | 6 |
| 8 | 15 | 6 |
| 9 | 15 | 6 |
| 10 | 15 | 6 |
| 11 | 15 | 6 |
| 12 | 15 | 6 |
| 13 | 15 | 6 |
| 14 | 15 | 6 |
| 15 | 15 | 6 |
| 16 | 16 | 7 |
| 17 | 16 | 7 |
| 18 | 16 | 7 |
| 19 | 16 | 7 |
| 20 | 16 | 7 |
| 21 | 16 | 7 |
| 22 | 16 | 8 |
| 23 | 16 | 8 |
| 24 | 17 | 8 |
| 25 | 17 | 8 |
| 26 | 17 | 8 |
| 27 | 17 | 8 |
| 28 | 17 | 9 |
| 29 | 17 | 9 |
| 30 | 17 | 9 |
How April really feels in Biella
Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Biella weather by month
How April compares with the rest of the year at a glance. April is the 6th-warmest and 5th-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° / -1° | 73 | 9.9 | 4.7 | 8.9 | 0.5 |
| Feb | 8° / 0° | 73 | 9.4 | 4 | 10.1 | 1.3 |
| Mar | 12° / 3° | 99 | 11.2 | 2.4 | 11.6 | 3.3 |
| Apr | 16° / 7° | 144 | 13.5 | 1.2 | 13.3 | 4.4 |
| May | 20° / 11° | 168 | 15.7 | 0.1 | 14.7 | 5.4 |
| Jun | 23° / 15° | 124 | 13.6 | 0 | 15.4 | 6.3 |
| Jul | 26° / 17° | 80 | 10.8 | 0 | 15.1 | 6.8 |
| Aug | 26° / 17° | 92 | 11.7 | 0 | 13.9 | 6.7 |
| Sep | 21° / 13° | 148 | 11.7 | 0 | 12.3 | 6.3 |
| Oct | 15° / 9° | 172 | 14.1 | 0.2 | 10.7 | 4.3 |
| Nov | 10° / 4° | 188 | 12.6 | 2.1 | 9.3 | 2.2 |
| Dec | 7° / 0° | 80 | 9.5 | 3.7 | 8.6 | 0.8 |
Cloud cover in April
The sky is clear or mostly clear about 32% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to cloud over as the month goes on.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 53 | 53 | 54 | 54 | 53 | 53 | 54 | 53 | 53 | 53 | 52 | 52 | 51 | 50 | 50 | 49 | 48 | 47 | 46 | 46 | 44 | 43 | 43 | 42 | 41 | 41 | 41 | 40 | 40 | 41 |
| Cloudier (%) | 47 | 47 | 46 | 46 | 47 | 47 | 46 | 47 | 47 | 47 | 48 | 48 | 49 | 50 | 50 | 51 | 52 | 53 | 54 | 54 | 56 | 57 | 57 | 58 | 59 | 59 | 59 | 60 | 60 | 59 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 53 | 47 |
| 2 | 53 | 47 |
| 3 | 54 | 46 |
| 4 | 54 | 46 |
| 5 | 53 | 47 |
| 6 | 53 | 47 |
| 7 | 54 | 46 |
| 8 | 53 | 47 |
| 9 | 53 | 47 |
| 10 | 53 | 47 |
| 11 | 52 | 48 |
| 12 | 52 | 48 |
| 13 | 51 | 49 |
| 14 | 50 | 50 |
| 15 | 50 | 50 |
| 16 | 49 | 51 |
| 17 | 48 | 52 |
| 18 | 47 | 53 |
| 19 | 46 | 54 |
| 20 | 46 | 54 |
| 21 | 44 | 56 |
| 22 | 43 | 57 |
| 23 | 43 | 57 |
| 24 | 42 | 58 |
| 25 | 41 | 59 |
| 26 | 41 | 59 |
| 27 | 41 | 59 |
| 28 | 40 | 60 |
| 29 | 40 | 60 |
| 30 | 41 | 59 |
Chance of precipitation in April
Biella gets around 144 mm of rain and snow over 13.5 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 45% and peaks near 53% on the wettest days, and about 1 day brings 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 44 | 44 | 44 | 45 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 52 | 53 |
| Snow chance (%) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 42 | 5 |
| 2 | 42 | 5 |
| 3 | 42 | 5 |
| 4 | 42 | 5 |
| 5 | 42 | 5 |
| 6 | 42 | 5 |
| 7 | 43 | 5 |
| 8 | 43 | 5 |
| 9 | 43 | 5 |
| 10 | 43 | 5 |
| 11 | 43 | 5 |
| 12 | 43 | 5 |
| 13 | 43 | 5 |
| 14 | 43 | 5 |
| 15 | 43 | 5 |
| 16 | 44 | 5 |
| 17 | 44 | 5 |
| 18 | 44 | 4 |
| 19 | 44 | 4 |
| 20 | 45 | 4 |
| 21 | 45 | 3 |
| 22 | 46 | 3 |
| 23 | 47 | 3 |
| 24 | 48 | 2 |
| 25 | 49 | 2 |
| 26 | 50 | 2 |
| 27 | 51 | 1 |
| 28 | 52 | 1 |
| 29 | 52 | 1 |
| 30 | 53 | 1 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 99 | 99 | 99 | 99 | 99 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 100 | 0 |
| 2 | 100 | 0 |
| 3 | 100 | 0 |
| 4 | 100 | 0 |
| 5 | 100 | 0 |
| 6 | 100 | 0 |
| 7 | 100 | 0 |
| 8 | 100 | 0 |
| 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 | 99 | 1 |
| 27 | 99 | 1 |
| 28 | 99 | 1 |
| 29 | 99 | 1 |
| 30 | 99 | 1 |
Wind in April
Winds average 5 km/h in April, the windiest month of the year.
Across April, daily wind ranges from about 5 km/h on the calmest days to 5 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 30 min at the start of April to 14 hours by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 90 minutes over April. Sunrise moves from 6:18 AM to 5:25 AM, and sunset from 6:47 PM to 7:25 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.5 | 12.5 | 12.6 | 12.6 | 12.7 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.4 | 13.4 | 13.5 | 13.5 | 13.6 | 13.6 | 13.7 | 13.7 | 13.8 | 13.8 | 13.9 | 13.9 | 14.0 |
| Sunrise (AM) | 6:18 | 6:16 | 6:14 | 6:12 | 6:10 | 6:08 | 6:06 | 6:04 | 6:03 | 6:01 | 5:59 | 5:57 | 5:55 | 5:53 | 5:51 | 5:49 | 5:48 | 5:46 | 5:44 | 5:42 | 5:40 | 5:39 | 5:37 | 5:35 | 5:34 | 5:32 | 5:30 | 5:29 | 5:27 | 5:25 |
| Sunset (PM) | 6:47 | 6:48 | 6:49 | 6:51 | 6:52 | 6:53 | 6:55 | 6:56 | 6:57 | 6:59 | 7:00 | 7:01 | 7:03 | 7:04 | 7:05 | 7:07 | 7:08 | 7:09 | 7:10 | 7:12 | 7:13 | 7:14 | 7:16 | 7:17 | 7:18 | 7:20 | 7:21 | 7:22 | 7:24 | 7:25 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 6:18 | 6:47 |
| 2 | 12.5 | 6:16 | 6:48 |
| 3 | 12.6 | 6:14 | 6:49 |
| 4 | 12.6 | 6:12 | 6:51 |
| 5 | 12.7 | 6:10 | 6:52 |
| 6 | 12.8 | 6:08 | 6:53 |
| 7 | 12.8 | 6:06 | 6:55 |
| 8 | 12.9 | 6:04 | 6:56 |
| 9 | 12.9 | 6:03 | 6:57 |
| 10 | 13.0 | 6:01 | 6:59 |
| 11 | 13.0 | 5:59 | 7:00 |
| 12 | 13.1 | 5:57 | 7:01 |
| 13 | 13.1 | 5:55 | 7:03 |
| 14 | 13.2 | 5:53 | 7:04 |
| 15 | 13.2 | 5:51 | 7:05 |
| 16 | 13.3 | 5:49 | 7:07 |
| 17 | 13.3 | 5:48 | 7:08 |
| 18 | 13.4 | 5:46 | 7:09 |
| 19 | 13.4 | 5:44 | 7:10 |
| 20 | 13.5 | 5:42 | 7:12 |
| 21 | 13.5 | 5:40 | 7:13 |
| 22 | 13.6 | 5:39 | 7:14 |
| 23 | 13.6 | 5:37 | 7:16 |
| 24 | 13.7 | 5:35 | 7:17 |
| 25 | 13.7 | 5:34 | 7:18 |
| 26 | 13.8 | 5:32 | 7:20 |
| 27 | 13.8 | 5:30 | 7:21 |
| 28 | 13.9 | 5:29 | 7:22 |
| 29 | 13.9 | 5:27 | 7:24 |
| 30 | 14.0 | 5:25 | 7:25 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 4.73 kWh/m².
For context, solar energy here swings from a low near 1.31 kWh/m² to a high of 6.17 kWh/m² in July across the year — April's 4.73 kWh/m² falls in the middle.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.8 | 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 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.4 | Bright |
| 2 | 4.4 | Bright |
| 3 | 4.4 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.5 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.6 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.7 | Bright |
| 11 | 4.7 | Bright |
| 12 | 4.8 | Bright |
| 13 | 4.8 | Bright |
| 14 | 4.8 | Bright |
| 15 | 4.8 | Bright |
| 16 | 4.9 | Bright |
| 17 | 4.9 | Bright |
| 18 | 4.9 | Bright |
| 19 | 4.9 | Bright |
| 20 | 4.9 | Bright |
| 21 | 4.9 | Bright |
| 22 | 4.9 | Bright |
| 23 | 4.9 | Bright |
| 24 | 4.9 | Bright |
| 25 | 4.9 | Bright |
| 26 | 4.9 | Bright |
| 27 | 4.9 | Bright |
| 28 | 4.9 | Bright |
| 29 | 4.9 | Bright |
| 30 | 4.9 | Bright |
Is April a good time to visit Biella?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Biella for sightseeing.
What to pack for Biella in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Biella sees daytime highs around 16°C and nights near 7°C. Pack rain gear. Worth having: a warm layer and sun protection. About 14 days see rain.
UV index in Biella in April
Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Biella peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (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) | 1 | 3 | 5 | 6 | 8 | 8 | 9 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Biella?
Biella sits at 45.6°N, 8.1°E, 420 m above sea level, in Italy. The nearest listed city is Ivrea, 18 km away.
Topography around Biella
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Biella.
Within 3 km, the terrain around Biella has significant variations in elevation — a maximum elevation change of 277 m around an average of 415 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,395 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,443 m.
The land around Biella is covered by trees (43%) and artificial surfaces (35%) within 3 km, trees (60%) and grassland (24%) within 16 km, and trees (41%) and cropland (21%) within 80 km.
Italy travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 230 V · 50 Hz
- Prices
- ≈ 69% of US
- price level, 2025
- GDP per capita
- $43,309
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 513
- 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 Biella (45.563°, 8.058°, elevation 420 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).