Guemar weather in February
In February, Guemar sees average daytime highs of 19°C and overnight lows near 8°C, with 5 mm of rain across 1.4 wet days and about 10.8 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.
Highs climb over the month, from about 17°C in the first days to 20°C by the end. The sky is clear or mostly clear about 74% of the time in February, and the air most often feels dry.
Daylight stretches from about 10 h 24 min at the start of February to 11 h 12 min by month's end. Set against the rest of the year, February is Guemar's 4th-clearest and 7th-windiest month. For the whole year in context, see Guemar's year-round climate.
- Daytime high
- 19°
- 10th warmest
- Overnight low
- 8°
- 3rd coldest
- Rainfall
- 5 mm
- 1.4 wet days
- Daylight
- 10 h 48 min
- 7:25 AM – 6:10 PM
- Cloud cover
- 24%
- 4th clearest
- Wind
- 15 km/h
- 7th windiest
- Solar energy
- 4.62 kWh/m²
- Travel score
- 7.9
- out of 10
Temperature in February
Highs climb over the month, from about 17°C in the first days to 20°C by the end.
A typical February day in Guemar reaches about 19°C in the afternoon and slips back to 8°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, February runs about 2°C warmer than January and about 4°C cooler than March.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 |
| Avg low (°C) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 17 | 7 |
| 2 | 17 | 7 |
| 3 | 17 | 7 |
| 4 | 18 | 7 |
| 5 | 18 | 7 |
| 6 | 18 | 7 |
| 7 | 18 | 7 |
| 8 | 18 | 7 |
| 9 | 18 | 7 |
| 10 | 18 | 7 |
| 11 | 18 | 7 |
| 12 | 18 | 7 |
| 13 | 19 | 8 |
| 14 | 19 | 8 |
| 15 | 19 | 8 |
| 16 | 19 | 8 |
| 17 | 19 | 8 |
| 18 | 19 | 8 |
| 19 | 19 | 8 |
| 20 | 20 | 8 |
| 21 | 20 | 8 |
| 22 | 20 | 9 |
| 23 | 20 | 9 |
| 24 | 20 | 9 |
| 25 | 20 | 9 |
| 26 | 21 | 9 |
| 27 | 21 | 9 |
| 28 | 21 | 9 |
How February really feels in Guemar
Once humidity and wind are folded in, February 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.
February sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Guemar weather by month
How February compares with the rest of the year at a glance. February is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 17° / 6° | 11 | 1.8 | 10 | 6.8 |
| Feb | 19° / 8° | 5 | 1.4 | 10.8 | 7.9 |
| Mar | 23° / 11° | 10 | 1.9 | 11.7 | 8.7 |
| Apr | 27° / 15° | 9 | 1.2 | 12.8 | 8.0 |
| May | 33° / 20° | 3 | 0.7 | 13.7 | 4.8 |
| Jun | 38° / 25° | 2 | 0.1 | 14.2 | 1.5 |
| Jul | 41° / 27° | 0 | 0.1 | 14 | 0.0 |
| Aug | 40° / 27° | 1 | 0.4 | 13.2 | 0.2 |
| Sep | 35° / 24° | 9 | 1.4 | 12.2 | 3.1 |
| Oct | 29° / 18° | 6 | 1.2 | 11.2 | 6.9 |
| Nov | 22° / 12° | 9 | 1.5 | 10.3 | 8.5 |
| Dec | 17° / 8° | 7 | 1.9 | 9.8 | 7.3 |
Cloud cover in February
The sky is clear or mostly clear about 74% of the time in February.
Beyond those clear spells, partly cloudy skies cover about 9% of February, with mostly cloudy or overcast conditions the remaining 18%.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 83 | 83 | 83 | 83 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 83 | 83 | 83 | 82 | 82 | 82 | 82 | 82 | 82 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 |
| Cloudier (%) | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 83 | 17 |
| 2 | 83 | 17 |
| 3 | 83 | 17 |
| 4 | 83 | 17 |
| 5 | 84 | 16 |
| 6 | 84 | 16 |
| 7 | 84 | 16 |
| 8 | 84 | 16 |
| 9 | 84 | 16 |
| 10 | 84 | 16 |
| 11 | 84 | 16 |
| 12 | 83 | 17 |
| 13 | 83 | 17 |
| 14 | 83 | 17 |
| 15 | 82 | 18 |
| 16 | 82 | 18 |
| 17 | 82 | 18 |
| 18 | 82 | 18 |
| 19 | 82 | 18 |
| 20 | 82 | 18 |
| 21 | 81 | 19 |
| 22 | 81 | 19 |
| 23 | 81 | 19 |
| 24 | 81 | 19 |
| 25 | 81 | 19 |
| 26 | 81 | 19 |
| 27 | 81 | 19 |
| 28 | 81 | 19 |
Chance of precipitation in February
Guemar gets around 5 mm of rain over 1.4 wet days in February. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 4% and peaks near 5% on the wettest days.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Rain chance (%) | |
|---|---|
| 1 | 5 |
| 2 | 5 |
| 3 | 5 |
| 4 | 5 |
| 5 | 5 |
| 6 | 5 |
| 7 | 5 |
| 8 | 5 |
| 9 | 5 |
| 10 | 5 |
| 11 | 5 |
| 12 | 5 |
| 13 | 4 |
| 14 | 4 |
| 15 | 4 |
| 16 | 4 |
| 17 | 4 |
| 18 | 4 |
| 19 | 4 |
| 20 | 4 |
| 21 | 4 |
| 22 | 4 |
| 23 | 4 |
| 24 | 4 |
| 25 | 4 |
| 26 | 4 |
| 27 | 4 |
| 28 | 4 |
Humidity in February
Most of February feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, February 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 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 |
Wind in February
Winds average 15 km/h in February.
Across February, daily wind ranges from about 15 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 |
| 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 |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 15 | light breeze |
| 2 | 15 | light breeze |
| 3 | 15 | light breeze |
| 4 | 15 | light breeze |
| 5 | 15 | light breeze |
| 6 | 15 | light breeze |
| 7 | 15 | light breeze |
| 8 | 15 | 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 | 16 | light breeze |
| 28 | 16 | light breeze |
Sunrise & sunset in February
Daylight runs from about 10 h 24 min at the start of February to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 48 minutes over February. Sunrise moves from 7:35 AM to 7:11 AM, and sunset from 5:57 PM to 6:22 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.4 | 10.4 | 10.4 | 10.4 | 10.5 | 10.5 | 10.5 | 10.6 | 10.6 | 10.6 | 10.6 | 10.7 | 10.7 | 10.7 | 10.8 | 10.8 | 10.8 | 10.9 | 10.9 | 10.9 | 11.0 | 11.0 | 11.0 | 11.1 | 11.1 | 11.1 | 11.2 | 11.2 |
| Sunrise (AM) | 7:35 | 7:35 | 7:34 | 7:34 | 7:33 | 7:32 | 7:31 | 7:31 | 7:30 | 7:29 | 7:28 | 7:27 | 7:26 | 7:25 | 7:25 | 7:24 | 7:23 | 7:22 | 7:21 | 7:20 | 7:18 | 7:17 | 7:16 | 7:15 | 7:14 | 7:13 | 7:12 | 7:11 |
| Sunset (PM) | 5:57 | 5:58 | 5:59 | 6:00 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:07 | 6:08 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:17 | 6:18 | 6:19 | 6:20 | 6:21 | 6:22 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.4 | 7:35 | 5:57 |
| 2 | 10.4 | 7:35 | 5:58 |
| 3 | 10.4 | 7:34 | 5:59 |
| 4 | 10.4 | 7:34 | 6:00 |
| 5 | 10.5 | 7:33 | 6:01 |
| 6 | 10.5 | 7:32 | 6:02 |
| 7 | 10.5 | 7:31 | 6:03 |
| 8 | 10.6 | 7:31 | 6:04 |
| 9 | 10.6 | 7:30 | 6:05 |
| 10 | 10.6 | 7:29 | 6:06 |
| 11 | 10.6 | 7:28 | 6:07 |
| 12 | 10.7 | 7:27 | 6:08 |
| 13 | 10.7 | 7:26 | 6:08 |
| 14 | 10.7 | 7:25 | 6:09 |
| 15 | 10.8 | 7:25 | 6:10 |
| 16 | 10.8 | 7:24 | 6:11 |
| 17 | 10.8 | 7:23 | 6:12 |
| 18 | 10.9 | 7:22 | 6:13 |
| 19 | 10.9 | 7:21 | 6:14 |
| 20 | 10.9 | 7:20 | 6:15 |
| 21 | 11.0 | 7:18 | 6:16 |
| 22 | 11.0 | 7:17 | 6:17 |
| 23 | 11.0 | 7:16 | 6:17 |
| 24 | 11.1 | 7:15 | 6:18 |
| 25 | 11.1 | 7:14 | 6:19 |
| 26 | 11.1 | 7:13 | 6:20 |
| 27 | 11.2 | 7:12 | 6:21 |
| 28 | 11.2 | 7:11 | 6:22 |
Solar energy in February
Average shortwave solar energy reaching the ground each day in February, about 4.62 kWh/m².
For context, solar energy here swings from a low near 3.1 kWh/m² to a high of 7.94 kWh/m² in June across the year — February's 4.62 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.0 | 4.1 | 4.1 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.5 | 4.5 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.0 | Bright |
| 2 | 4.1 | Bright |
| 3 | 4.1 | Bright |
| 4 | 4.2 | Bright |
| 5 | 4.2 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.3 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.4 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.5 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.7 | Bright |
| 16 | 4.7 | Bright |
| 17 | 4.7 | Bright |
| 18 | 4.8 | Bright |
| 19 | 4.8 | Bright |
| 20 | 4.8 | Bright |
| 21 | 4.9 | Bright |
| 22 | 4.9 | Bright |
| 23 | 5.0 | Bright |
| 24 | 5.0 | Bright |
| 25 | 5.1 | Bright |
| 26 | 5.1 | Bright |
| 27 | 5.1 | Bright |
| 28 | 5.2 | Bright |
Hazard calendar for Guemar
None of Guemar's seasonal hazards are active in February. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Guemar sees seasonal dust haze (March–September), heaviest in June.
Is February a good time to visit Guemar?
Our two travel scores rate February for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
February is one of the better times to visit Guemar for general sightseeing.
What to pack for Guemar in February
From February's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In February, Guemar sees daytime highs around 19°C and nights near 8°C. Worth packing: a warm layer and sun protection.
UV index in Guemar in February
Clear-sky midday UV in February peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Guemar peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 7 | 5 | 7 | 10 | 9 | 8 | 8 | 7 | 4 | 3 |
| Level | Moderate | High | High | High | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | High |
| Mar | 7 | High |
| Apr | 5 | High |
| May | 7 | High |
| Jun | 10 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 7 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Guemar in February
Average fine-particle pollution (PM2.5) through the year — so you can see where February falls, not just the annual average.
Air quality in Guemar is worst in June — around 76 µg/m³ PM2.5 (unhealthy), about 2.5× the cleanest month (December, 31 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) | 38 | 37 | 53 | 72 | 67 | 76 | 59 | 53 | 50 | 38 | 32 | 31 |
| Level | Poor | Poor | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 38 | Poor |
| Feb | 37 | Poor |
| Mar | 53 | Poor |
| Apr | 72 | Unhealthy |
| May | 67 | Unhealthy |
| Jun | 76 | Unhealthy |
| Jul | 59 | Unhealthy |
| Aug | 53 | Poor |
| Sep | 50 | Poor |
| Oct | 38 | Poor |
| Nov | 32 | Moderate |
| Dec | 31 | Moderate |
Where is Guemar?
Guemar sits at 33.5°N, 6.8°E, 65 m above sea level, in Algeria. The nearest listed city is Reguiba, 12 km away.
Topography around Guemar
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Guemar.
Within 3 km, the terrain around Guemar has only modest variations in elevation — a maximum elevation change of 21 m around an average of 64 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 81 m; within 80 km, only modest variations in elevation — a maximum elevation change of 182 m.
The land around Guemar is covered by bare terrain (68%) and artificial surfaces (23%) within 3 km, bare terrain (80%) within 16 km, and bare terrain (98%) within 80 km.
Algeria travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 33% of US
- price level, 2025
- GDP per capita
- $6,051
- 2025
- Happiness
- 5.7 / 10
- World Happiness, 2025
- Safe drinking water
- 69%
- of population, 2024
- Homicide rate
- 1.2
- per 100k, 2023
- Road deaths
- 20.9
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 468
- 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 Guemar (33.4853°, 6.7969°, elevation 65 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. 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).