Haarlem weather in February
In February, Haarlem sees average daytime highs of 6°C and overnight lows near 3°C, with 54 mm of precipitation across 10.9 wet days and about 9.5 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 6°C through the month. The sky is clear or mostly clear about 15% of the time in February, and the air most often feels dry.
Daylight stretches from about 8 h 42 min at the start of February to 10 h 24 min by month's end. Set against the rest of the year, February is Haarlem's 9th-clearest and 3rd-windiest month. For the whole year in context, see Haarlem's year-round climate.
- Daytime high
- 6°
- 11th warmest
- Overnight low
- 3°
- 1st coldest
- Precipitation
- 54 mm
- 10.9 wet days
- Daylight
- 9 h 30 min
- 8:10 AM – 5:42 PM
- Cloud cover
- 72%
- 9th clearest
- Wind
- 22 km/h
- 3rd windiest
- Solar energy
- 1.49 kWh/m²
- Travel score
- 0.4
- out of 10
Haarlem is municipality in the Netherlands and capital city of North Holland.
- Air quality
- Good
- PM10 18 µg/m³ · 2019
- Density
- 5,065/km²
- people per km²
- Founded
- 1185
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in February
Day-to-day highs hold fairly steady near 6°C through the month.
A typical February day in Haarlem reaches about 6°C in the afternoon and slips back to 3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 10°C. Set against its neighbours, February runs on par with January and about 2°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) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 |
| Avg low (°C) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 6 | 2 |
| 2 | 6 | 2 |
| 3 | 6 | 2 |
| 4 | 6 | 2 |
| 5 | 6 | 2 |
| 6 | 6 | 2 |
| 7 | 6 | 2 |
| 8 | 6 | 2 |
| 9 | 6 | 2 |
| 10 | 6 | 2 |
| 11 | 6 | 2 |
| 12 | 6 | 2 |
| 13 | 6 | 2 |
| 14 | 6 | 2 |
| 15 | 6 | 2 |
| 16 | 6 | 2 |
| 17 | 6 | 3 |
| 18 | 6 | 3 |
| 19 | 6 | 3 |
| 20 | 6 | 3 |
| 21 | 6 | 3 |
| 22 | 6 | 3 |
| 23 | 6 | 3 |
| 24 | 7 | 3 |
| 25 | 7 | 3 |
| 26 | 7 | 3 |
| 27 | 7 | 3 |
| 28 | 7 | 3 |
How February really feels in Haarlem
Once humidity and wind are folded in, February averages 0 days that feel above 32°C and 28 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in February is cold — wind chill drags the overnight "feels like" below the raw low.
Haarlem weather by month
How February compares with the rest of the year at a glance. February is the 11th-warmest and 10th-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° | 69 | 13.2 | 0.9 | 8 | 0.3 |
| Feb | 6° / 3° | 54 | 10.9 | 1.4 | 9.5 | 0.4 |
| Mar | 8° / 4° | 52 | 10.8 | 0.7 | 11.5 | 1.5 |
| Apr | 12° / 6° | 44 | 10.1 | 0 | 13.6 | 3.0 |
| May | 15° / 10° | 58 | 10.4 | 0 | 15.4 | 4.6 |
| Jun | 18° / 13° | 63 | 11.3 | 0 | 16.5 | 5.5 |
| Jul | 20° / 15° | 79 | 13.1 | 0 | 16.1 | 5.9 |
| Aug | 20° / 15° | 90 | 13.3 | 0 | 14.5 | 5.9 |
| Sep | 18° / 13° | 84 | 12.7 | 0 | 12.4 | 5.2 |
| Oct | 14° / 10° | 88 | 14.1 | 0 | 10.3 | 3.6 |
| Nov | 10° / 6° | 77 | 14.8 | 0.2 | 8.5 | 1.8 |
| Dec | 7° / 4° | 80 | 14.3 | 0.9 | 7.5 | 0.7 |
Cloud cover in February
The sky is clear or mostly clear about 15% of the time in February.
Beyond those clear spells, partly cloudy skies cover about 14% of February, with mostly cloudy or overcast conditions the remaining 71%.
| 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 (%) | 24 | 25 | 26 | 26 | 27 | 27 | 28 | 28 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 31 | 30 | 30 | 30 | 29 |
| Cloudier (%) | 76 | 75 | 74 | 74 | 73 | 73 | 72 | 72 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 69 | 69 | 70 | 70 | 69 | 70 | 70 | 70 | 71 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 24 | 76 |
| 2 | 25 | 75 |
| 3 | 26 | 74 |
| 4 | 26 | 74 |
| 5 | 27 | 73 |
| 6 | 27 | 73 |
| 7 | 28 | 72 |
| 8 | 28 | 72 |
| 9 | 30 | 70 |
| 10 | 30 | 70 |
| 11 | 30 | 70 |
| 12 | 30 | 70 |
| 13 | 30 | 70 |
| 14 | 30 | 70 |
| 15 | 30 | 70 |
| 16 | 31 | 69 |
| 17 | 31 | 69 |
| 18 | 31 | 69 |
| 19 | 31 | 69 |
| 20 | 31 | 69 |
| 21 | 31 | 69 |
| 22 | 30 | 70 |
| 23 | 30 | 70 |
| 24 | 31 | 69 |
| 25 | 30 | 70 |
| 26 | 30 | 70 |
| 27 | 30 | 70 |
| 28 | 29 | 71 |
Chance of precipitation in February
Haarlem gets around 54 mm of rain and snow over 10.9 wet days in February. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 39% and peaks near 43% on the wettest days, and about 1 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 38 | 38 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 37 | 37 | 38 | 38 | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 41 | 42 | 42 | 43 | 43 | 43 | 43 |
| Snow chance (%) | 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 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 38 | 5 |
| 2 | 38 | 5 |
| 3 | 38 | 5 |
| 4 | 38 | 5 |
| 5 | 38 | 5 |
| 6 | 38 | 5 |
| 7 | 37 | 5 |
| 8 | 37 | 5 |
| 9 | 37 | 5 |
| 10 | 37 | 5 |
| 11 | 37 | 5 |
| 12 | 37 | 5 |
| 13 | 38 | 5 |
| 14 | 38 | 5 |
| 15 | 38 | 5 |
| 16 | 38 | 5 |
| 17 | 39 | 5 |
| 18 | 39 | 5 |
| 19 | 39 | 5 |
| 20 | 40 | 5 |
| 21 | 40 | 5 |
| 22 | 41 | 5 |
| 23 | 42 | 5 |
| 24 | 42 | 5 |
| 25 | 43 | 5 |
| 26 | 43 | 5 |
| 27 | 43 | 5 |
| 28 | 43 | 5 |
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 22 km/h in February.
Across February, daily wind ranges from about 22 km/h on the calmest days to 22 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) | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 22 | breezy |
| 2 | 22 | breezy |
| 3 | 22 | breezy |
| 4 | 22 | breezy |
| 5 | 22 | breezy |
| 6 | 22 | breezy |
| 7 | 22 | breezy |
| 8 | 22 | breezy |
| 9 | 22 | breezy |
| 10 | 22 | breezy |
| 11 | 22 | breezy |
| 12 | 22 | breezy |
| 13 | 22 | breezy |
| 14 | 22 | breezy |
| 15 | 22 | breezy |
| 16 | 22 | breezy |
| 17 | 22 | breezy |
| 18 | 22 | breezy |
| 19 | 22 | breezy |
| 20 | 22 | breezy |
| 21 | 22 | breezy |
| 22 | 22 | breezy |
| 23 | 22 | breezy |
| 24 | 22 | breezy |
| 25 | 22 | breezy |
| 26 | 22 | breezy |
| 27 | 22 | breezy |
| 28 | 22 | breezy |
Sunrise & sunset in February
Daylight runs from about 8 h 42 min at the start of February to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 102 minutes over February. Sunrise moves from 8:34 AM to 7:43 AM, and sunset from 5:16 PM to 6:07 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) | 8.7 | 8.8 | 8.8 | 8.9 | 8.9 | 9.0 | 9.1 | 9.1 | 9.2 | 9.2 | 9.3 | 9.4 | 9.4 | 9.5 | 9.5 | 9.6 | 9.7 | 9.7 | 9.8 | 9.9 | 9.9 | 10.0 | 10.1 | 10.1 | 10.2 | 10.3 | 10.3 | 10.4 |
| Sunrise (AM) | 8:34 | 8:32 | 8:31 | 8:29 | 8:27 | 8:26 | 8:24 | 8:22 | 8:21 | 8:19 | 8:17 | 8:15 | 8:14 | 8:12 | 8:10 | 8:08 | 8:06 | 8:04 | 8:02 | 8:00 | 7:58 | 7:56 | 7:54 | 7:52 | 7:50 | 7:47 | 7:45 | 7:43 |
| Sunset (PM) | 5:16 | 5:18 | 5:20 | 5:22 | 5:24 | 5:25 | 5:27 | 5:29 | 5:31 | 5:33 | 5:35 | 5:37 | 5:39 | 5:40 | 5:42 | 5:44 | 5:46 | 5:48 | 5:50 | 5:52 | 5:54 | 5:55 | 5:57 | 5:59 | 6:01 | 6:03 | 6:05 | 6:07 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 8.7 | 8:34 | 5:16 |
| 2 | 8.8 | 8:32 | 5:18 |
| 3 | 8.8 | 8:31 | 5:20 |
| 4 | 8.9 | 8:29 | 5:22 |
| 5 | 8.9 | 8:27 | 5:24 |
| 6 | 9.0 | 8:26 | 5:25 |
| 7 | 9.1 | 8:24 | 5:27 |
| 8 | 9.1 | 8:22 | 5:29 |
| 9 | 9.2 | 8:21 | 5:31 |
| 10 | 9.2 | 8:19 | 5:33 |
| 11 | 9.3 | 8:17 | 5:35 |
| 12 | 9.4 | 8:15 | 5:37 |
| 13 | 9.4 | 8:14 | 5:39 |
| 14 | 9.5 | 8:12 | 5:40 |
| 15 | 9.5 | 8:10 | 5:42 |
| 16 | 9.6 | 8:08 | 5:44 |
| 17 | 9.7 | 8:06 | 5:46 |
| 18 | 9.7 | 8:04 | 5:48 |
| 19 | 9.8 | 8:02 | 5:50 |
| 20 | 9.9 | 8:00 | 5:52 |
| 21 | 9.9 | 7:58 | 5:54 |
| 22 | 10.0 | 7:56 | 5:55 |
| 23 | 10.1 | 7:54 | 5:57 |
| 24 | 10.1 | 7:52 | 5:59 |
| 25 | 10.2 | 7:50 | 6:01 |
| 26 | 10.3 | 7:47 | 6:03 |
| 27 | 10.3 | 7:45 | 6:05 |
| 28 | 10.4 | 7:43 | 6:07 |
Solar energy in February
Average shortwave solar energy reaching the ground each day in February, about 1.49 kWh/m².
For context, solar energy here swings from a low near 0.57 kWh/m² to a high of 5.65 kWh/m² in June across the year — February's 1.49 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) | 1.1 | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | 1.4 | 1.4 | 1.4 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 | 1.8 | 1.8 | 1.8 | 1.9 | 1.9 | 1.9 | 2.0 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.1 | Dim |
| 2 | 1.1 | Dim |
| 3 | 1.1 | Dim |
| 4 | 1.1 | Dim |
| 5 | 1.2 | Dim |
| 6 | 1.2 | Dim |
| 7 | 1.2 | Dim |
| 8 | 1.3 | Dim |
| 9 | 1.3 | Dim |
| 10 | 1.3 | Dim |
| 11 | 1.4 | Dim |
| 12 | 1.4 | Dim |
| 13 | 1.4 | Dim |
| 14 | 1.5 | Dim |
| 15 | 1.5 | Dim |
| 16 | 1.6 | Dim |
| 17 | 1.6 | Dim |
| 18 | 1.6 | Dim |
| 19 | 1.7 | Dim |
| 20 | 1.7 | Dim |
| 21 | 1.7 | Dim |
| 22 | 1.8 | Dim |
| 23 | 1.8 | Dim |
| 24 | 1.8 | Dim |
| 25 | 1.9 | Dim |
| 26 | 1.9 | Dim |
| 27 | 1.9 | Dim |
| 28 | 2.0 | Dim |
Is February a good time to visit Haarlem?
Our two travel scores rate February for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
February is a weaker month for outdoor sightseeing in Haarlem.
What to pack for Haarlem in February
From February's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In February, Haarlem sees daytime highs around 6°C and nights near 3°C. Pack a warm layer. Worth having: a heavy coat, rain gear and a windbreaker. About 11 days see rain.
Sea temperature near Haarlem in February
The nearest coast averages about 6°C in February — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 18 km away) is warmest in August at about 19°C and coldest in February near 6°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 6 | 6 | 8 | 12 | 15 | 17 | 19 | 18 | 15 | 11 | 8 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 6 | Bracing |
| Mar | 6 | Bracing |
| Apr | 8 | Bracing |
| May | 12 | Bracing |
| Jun | 15 | Bracing |
| Jul | 17 | Cool |
| Aug | 19 | Cool |
| Sep | 18 | Cool |
| Oct | 15 | Bracing |
| Nov | 11 | Bracing |
| Dec | 8 | Bracing |
UV index in Haarlem in February
Clear-sky midday UV in February peaks around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Haarlem peaks around June 23 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. 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 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 3 | 5 | 6 | 6 | 6 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | Moderate | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 3 | Moderate |
| May | 5 | Moderate |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Haarlem?
Haarlem sits at 52.4°N, 4.6°E, 10 m above sea level, in The Netherlands. The nearest listed city is Heemstede, 4.0 km away.
Topography around Haarlem
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Haarlem.
Within 3 km, the terrain around Haarlem has only modest variations in elevation — a maximum elevation change of 52 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, only modest variations in elevation — a maximum elevation change of 99 m.
The land around Haarlem is covered by artificial surfaces (50%) and trees (35%) within 3 km, water (26%), grassland (24%) and artificial surfaces (22%) within 16 km, and water (40%) and grassland (27%) within 80 km.
The Netherlands travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 84% of US
- price level, 2025
- GDP per capita
- $73,684
- 2025
- Happiness
- 7.2 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 4
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 624
- 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 Haarlem (52.3808°, 4.6368°, elevation 10 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).