Daylight through the yearLongest day (Jun 21): 13 h 14 min5:51 am – 7:05 pmShortest day (Dec 21): 11 h 2 min6:54 am – 5:55 pm
Sun todaySunrise –Sunset –
ClimateWarmest month June: highs 87°F, lows 66°FColdest month January: highs 80°F, lows 61°F85 in of rain a year, on about 124 dayswettest month MaySnow is rare33 days above 90°F, 0 nights below freezing in a typical yearSource: NOAA 1991-2020 Climate Normals, Arecibo Obsy, Pr Rq station, 6 mi away
Earthquakes5,106 of magnitude 3 or more within 50 miles since 1970211 of magnitude 4+, 26 of magnitude 5+Largest: magnitude 6.4 on 7 Jan 202033 mi away, near Indios, Puerto RicoMost recent: magnitude 3.1 on 20 Sep 202633 mi awaySource: USGS Earthquake Catalog
Natural hazardsOverall risk Insufficient DataArecibo Municipio, PR, compared with all US countiesSource: FEMA National Risk Index (county level)
Air quality61% of days had good air in 2025209 of 345 days measured136 moderate daysMedian index 45, worst day 99main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, nearest monitors: Catano County, PR, 37 mi away
Drinking waterArecibo Urbanoserves 61,626 people from surface water1 health-based violation since 2021latest Aug 2022: surface water treatment, treatment techniqueSource: US EPA Safe Drinking Water Information System, largest system serving the town
Elevation35 ft11 m above sea levelSource: USGS 3D Elevation Program
