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Temperatures on the Osa Peninsula are pleasant year-round. The sunniest and warmest months are from January through April with temperatures dropping slightly but steadily with the onset of the rains in May. October and November mark the height of the wet season on the Osa; during this period it is possible to get more than one meter of rain in a month!
With the Greg Gund Conservation Center sitting atop a hill at 250 meters above sea level and the Piro Research Center at only 30 meters above sea level, we see marked differences in temperature, rainfall, humidity and wind at each location, despite a mere 2 km separating the two.
Average temperature: 26°C/79°F
Annual precipitation: 5000-6000 mm/197-236 in
Humidity: ~90%
Wet season: Jun-Nov (rains most days generally in the late afternoon and evening)
Dry season: Dec-May (it still rains but much less) | 
