Arecibo weather in December
In December, Arecibo sees average daytime highs of 27°C and overnight lows near 23°C, with 48 mm of rain across 11.4 wet days and about 10.9 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 61% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 11 hours at the start of December to 10 h 54 min by month's end. Set against the rest of the year, December is Arecibo's 3rd-clearest and 4th-windiest month. For the whole year in context, see Arecibo's year-round climate.
- Daytime high
- 27°
- 10th warmest
- Overnight low
- 23°
- 5th coldest
- Rainfall
- 48 mm
- 11.4 wet days
- Daylight
- 10 h 54 min
- 6:56 AM – 5:50 PM
- Cloud cover
- 40%
- 3rd clearest
- Wind
- 15 km/h
- 4th windiest
- Solar energy
- 4.4 kWh/m²
- Travel score
- 6.6
- out of 10
Temperature in December
Day-to-day highs hold fairly steady near 27°C through the month.
A typical December day in Arecibo reaches about 27°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, December runs about 1°C cooler than November and on par with 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) | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 27 | 23 |
| 2 | 27 | 23 |
| 3 | 27 | 23 |
| 4 | 27 | 23 |
| 5 | 27 | 23 |
| 6 | 27 | 23 |
| 7 | 27 | 23 |
| 8 | 27 | 23 |
| 9 | 27 | 23 |
| 10 | 27 | 23 |
| 11 | 27 | 23 |
| 12 | 27 | 23 |
| 13 | 27 | 23 |
| 14 | 27 | 23 |
| 15 | 27 | 23 |
| 16 | 27 | 23 |
| 17 | 27 | 22 |
| 18 | 27 | 22 |
| 19 | 27 | 22 |
| 20 | 27 | 22 |
| 21 | 27 | 22 |
| 22 | 27 | 22 |
| 23 | 27 | 22 |
| 24 | 27 | 22 |
| 25 | 27 | 22 |
| 26 | 27 | 22 |
| 27 | 27 | 22 |
| 28 | 27 | 22 |
| 29 | 27 | 22 |
| 30 | 27 | 22 |
| 31 | 27 | 22 |
How December really feels in Arecibo
Once humidity and wind are folded in, December 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.
December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Arecibo weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 22° | 41 | 9.5 | 11 | 7.0 |
| Feb | 27° / 22° | 36 | 8.1 | 11.4 | 7.0 |
| Mar | 27° / 22° | 59 | 10 | 11.9 | 6.7 |
| Apr | 28° / 22° | 107 | 13.7 | 12.4 | 5.8 |
| May | 29° / 24° | 165 | 18.3 | 12.9 | 4.5 |
| Jun | 30° / 24° | 92 | 13.8 | 13.1 | 4.6 |
| Jul | 30° / 25° | 79 | 14.9 | 13 | 4.5 |
| Aug | 30° / 25° | 101 | 19.6 | 12.6 | 3.9 |
| Sep | 30° / 25° | 154 | 22.3 | 12.1 | 3.6 |
| Oct | 29° / 24° | 138 | 21.4 | 11.6 | 4.0 |
| Nov | 28° / 23° | 113 | 17.5 | 11.1 | 5.2 |
| Dec | 27° / 23° | 48 | 11.4 | 10.9 | 6.6 |
Cloud cover in December
The sky is clear or mostly clear about 61% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 21% of December, with mostly cloudy or overcast conditions the remaining 18%. Skies tend to open up 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 78 | 79 | 79 | 80 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 83 | 84 | 84 | 84 | 85 | 85 | 85 | 85 | 86 |
| Cloudier (%) | 22 | 21 | 21 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 14 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 78 | 22 |
| 2 | 79 | 21 |
| 3 | 79 | 21 |
| 4 | 80 | 20 |
| 5 | 80 | 20 |
| 6 | 80 | 20 |
| 7 | 80 | 20 |
| 8 | 81 | 19 |
| 9 | 81 | 19 |
| 10 | 81 | 19 |
| 11 | 81 | 19 |
| 12 | 81 | 19 |
| 13 | 81 | 19 |
| 14 | 81 | 19 |
| 15 | 82 | 18 |
| 16 | 82 | 18 |
| 17 | 82 | 18 |
| 18 | 82 | 18 |
| 19 | 82 | 18 |
| 20 | 82 | 18 |
| 21 | 82 | 18 |
| 22 | 82 | 18 |
| 23 | 83 | 17 |
| 24 | 84 | 16 |
| 25 | 84 | 16 |
| 26 | 84 | 16 |
| 27 | 85 | 15 |
| 28 | 85 | 15 |
| 29 | 85 | 15 |
| 30 | 85 | 15 |
| 31 | 86 | 14 |
Chance of precipitation in December
Arecibo gets around 48 mm of rain over 11.4 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 36% and peaks near 40% on the wettest days. The odds ease 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 (%) | 40 | 40 | 39 | 39 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 34 | 34 | 33 | 33 | 33 | 32 |
| Rain chance (%) | |
|---|---|
| 1 | 40 |
| 2 | 40 |
| 3 | 39 |
| 4 | 39 |
| 5 | 38 |
| 6 | 38 |
| 7 | 38 |
| 8 | 38 |
| 9 | 37 |
| 10 | 37 |
| 11 | 37 |
| 12 | 37 |
| 13 | 36 |
| 14 | 36 |
| 15 | 36 |
| 16 | 36 |
| 17 | 37 |
| 18 | 37 |
| 19 | 37 |
| 20 | 37 |
| 21 | 36 |
| 22 | 36 |
| 23 | 36 |
| 24 | 35 |
| 25 | 35 |
| 26 | 34 |
| 27 | 34 |
| 28 | 33 |
| 29 | 33 |
| 30 | 33 |
| 31 | 32 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Muggy (%) | 26 | 27 | 28 | 29 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 37 | 38 | 39 | 40 | 41 | 43 | 44 | 45 | 47 | 48 | 50 | 52 | 53 | 55 | 56 | 57 | 59 | 60 |
| Oppressive (%) | 71 | 70 | 68 | 68 | 68 | 67 | 66 | 65 | 64 | 63 | 62 | 61 | 60 | 60 | 59 | 58 | 57 | 56 | 54 | 53 | 52 | 49 | 48 | 46 | 44 | 43 | 41 | 40 | 39 | 37 | 36 |
| Miserable (%) | 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 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 2 | 26 | 71 | 1 |
| 2 | 2 | 27 | 70 | 1 |
| 3 | 3 | 28 | 68 | 1 |
| 4 | 3 | 29 | 68 | 0 |
| 5 | 3 | 29 | 68 | 0 |
| 6 | 3 | 30 | 67 | 0 |
| 7 | 3 | 31 | 66 | 0 |
| 8 | 3 | 32 | 65 | 0 |
| 9 | 3 | 33 | 64 | 0 |
| 10 | 3 | 34 | 63 | 0 |
| 11 | 3 | 35 | 62 | 0 |
| 12 | 3 | 36 | 61 | 0 |
| 13 | 3 | 37 | 60 | 0 |
| 14 | 3 | 37 | 60 | 0 |
| 15 | 3 | 38 | 59 | 0 |
| 16 | 3 | 39 | 58 | 0 |
| 17 | 3 | 40 | 57 | 0 |
| 18 | 3 | 41 | 56 | 0 |
| 19 | 3 | 43 | 54 | 0 |
| 20 | 3 | 44 | 53 | 0 |
| 21 | 3 | 45 | 52 | 0 |
| 22 | 4 | 47 | 49 | 0 |
| 23 | 4 | 48 | 48 | 0 |
| 24 | 4 | 50 | 46 | 0 |
| 25 | 4 | 52 | 44 | 0 |
| 26 | 4 | 53 | 43 | 0 |
| 27 | 4 | 55 | 41 | 0 |
| 28 | 4 | 56 | 40 | 0 |
| 29 | 4 | 57 | 39 | 0 |
| 30 | 4 | 59 | 37 | 0 |
| 31 | 4 | 60 | 36 | 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) | 14 | 14 | 14 | 14 | 14 | 14 | 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 | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 14 | light breeze |
| 2 | 14 | light breeze |
| 3 | 14 | light breeze |
| 4 | 14 | light breeze |
| 5 | 14 | light breeze |
| 6 | 14 | 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 | 15 | light breeze |
| 28 | 15 | light breeze |
| 29 | 15 | light breeze |
| 30 | 16 | light breeze |
| 31 | 16 | light breeze |
Sunrise & sunset in December
Daylight runs from about 11 hours at the start of December to 10 h 54 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 6:48 AM to 7:03 AM, and sunset from 5:46 PM to 5:57 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) | 11.0 | 11.0 | 11.0 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 |
| Sunrise (AM) | 6:48 | 6:48 | 6:49 | 6:49 | 6:50 | 6:51 | 6:51 | 6:52 | 6:52 | 6:53 | 6:53 | 6:54 | 6:55 | 6:55 | 6:56 | 6:56 | 6:57 | 6:57 | 6:58 | 6:58 | 6:59 | 6:59 | 7:00 | 7:00 | 7:01 | 7:01 | 7:01 | 7:02 | 7:02 | 7:03 | 7:03 |
| Sunset (PM) | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:47 | 5:47 | 5:48 | 5:48 | 5:48 | 5:49 | 5:49 | 5:50 | 5:50 | 5:50 | 5:51 | 5:51 | 5:52 | 5:52 | 5:53 | 5:53 | 5:53 | 5:54 | 5:54 | 5:55 | 5:56 | 5:56 | 5:57 | 5:57 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.0 | 6:48 | 5:46 |
| 2 | 11.0 | 6:48 | 5:46 |
| 3 | 11.0 | 6:49 | 5:46 |
| 4 | 10.9 | 6:49 | 5:46 |
| 5 | 10.9 | 6:50 | 5:46 |
| 6 | 10.9 | 6:51 | 5:47 |
| 7 | 10.9 | 6:51 | 5:47 |
| 8 | 10.9 | 6:52 | 5:47 |
| 9 | 10.9 | 6:52 | 5:47 |
| 10 | 10.9 | 6:53 | 5:48 |
| 11 | 10.9 | 6:53 | 5:48 |
| 12 | 10.9 | 6:54 | 5:48 |
| 13 | 10.9 | 6:55 | 5:49 |
| 14 | 10.9 | 6:55 | 5:49 |
| 15 | 10.9 | 6:56 | 5:50 |
| 16 | 10.9 | 6:56 | 5:50 |
| 17 | 10.9 | 6:57 | 5:50 |
| 18 | 10.9 | 6:57 | 5:51 |
| 19 | 10.9 | 6:58 | 5:51 |
| 20 | 10.9 | 6:58 | 5:52 |
| 21 | 10.9 | 6:59 | 5:52 |
| 22 | 10.9 | 6:59 | 5:53 |
| 23 | 10.9 | 7:00 | 5:53 |
| 24 | 10.9 | 7:00 | 5:53 |
| 25 | 10.9 | 7:01 | 5:54 |
| 26 | 10.9 | 7:01 | 5:54 |
| 27 | 10.9 | 7:01 | 5:55 |
| 28 | 10.9 | 7:02 | 5:56 |
| 29 | 10.9 | 7:02 | 5:56 |
| 30 | 10.9 | 7:03 | 5:57 |
| 31 | 10.9 | 7:03 | 5:57 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 4.4 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 4.4 kWh/m² to a high of 6.53 kWh/m² in June across the year — December's 4.4 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) | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 |
| 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 | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.5 | Bright |
| 6 | 4.5 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.4 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.4 | Bright |
| 19 | 4.4 | Bright |
| 20 | 4.4 | Bright |
| 21 | 4.4 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.4 | Bright |
| 24 | 4.4 | Bright |
| 25 | 4.4 | Bright |
| 26 | 4.4 | Bright |
| 27 | 4.4 | Bright |
| 28 | 4.4 | Bright |
| 29 | 4.4 | Bright |
| 30 | 4.4 | Bright |
| 31 | 4.4 | Bright |
Hazard calendar for Arecibo
None of Arecibo's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Arecibo sits in the Atlantic hurricane belt; the season peaks August–October.
Arecibo sees seasonal dust haze (July), heaviest in July.
Is December a good time to visit Arecibo?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit Arecibo for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Arecibo in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Arecibo sees daytime highs around 27°C and nights near 23°C. Pack light clothes. Worth having: rain gear. About 11 days see rain.
Sea temperature near Arecibo in December
The nearest coast averages about 27°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 19 km away) is warmest in September at about 29°C and coldest in March near 26°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 26 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 26 | Warm |
| Mar | 26 | Warm |
| Apr | 27 | Warm |
| May | 27 | Warm |
| Jun | 28 | Tropical |
| Jul | 28 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in Arecibo in December
Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Arecibo peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 10 | 12 | 13 | 11 | 12 | 12 | 12 | 12 | 10 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Extreme |
| Mar | 12 | Extreme |
| Apr | 13 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Very high |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Arecibo 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 Arecibo is worst in July — around 24 µg/m³ PM2.5 (moderate), about 4.8× the cleanest month (January, 5 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) | 5 | 7 | 7 | 8 | 14 | 23 | 24 | 20 | 15 | 15 | 7 | 5 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 5 | Good |
| Feb | 7 | Good |
| Mar | 7 | Good |
| Apr | 8 | Good |
| May | 14 | Moderate |
| Jun | 23 | Moderate |
| Jul | 24 | Moderate |
| Aug | 20 | Moderate |
| Sep | 15 | Moderate |
| Oct | 15 | Moderate |
| Nov | 7 | Good |
| Dec | 5 | Good |
Where is Arecibo?
Arecibo sits at 18.5°N, 66.7°W, 7 m above sea level, in Puerto Rico. The nearest listed city is Barceloneta, 19 km away.
Topography around Arecibo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Arecibo.
Within 3 km, the terrain around Arecibo has only modest variations in elevation — a maximum elevation change of 80 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 408 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.
The land around Arecibo is covered by water (44%) and trees (20%) within 3 km, water (45%) and trees (35%) within 16 km, and water (55%) and trees (35%) within 80 km.
Puerto Rico travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 78% of US
- price level, 2025
- GDP per capita
- $40,620
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2015
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 14.6
- per 100k, 2023
- 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 Arecibo (18.4724°, -66.7157°, elevation 7 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).