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Guam Climate & Temperature

⛺ Guam has a tropical wet climate (Köppen-Geiger classification: Af) with no dry or cold season as it is constantly moist (year-round rainfall).tropical rainforest climate (Af)

🌡️ The mean annual temperature is 27.5 degrees Celsius (81.5 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.

🐬 Average monthly temperatures vary by 1.4 °C (2.5°F). This indicates that the continentality type is hyperoceanic, subtype extremely hyperoceanic.

☔ Total annual precipitation averages 2311.8 mm (91 inches) which is equivalent to 2311.8 Litres/m² (56.7 Gallons/ft²).

Guam Climate Graph

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✨ The longest day of the year is 12:47 long on the 22 of June and the shortest day is 11:12 long on the 21 of December.

🌞 On average there are 2422 hours of sunshine per year. Visit the sunshine and daylight section to check monthly details including how high in the sky the sun reaches each month.

🐇Were you to burrow down through the centre of the Earth from Guam you would pop up nearest to the climate station at Aracaju, Brazil where you would find a Tropical monsoonal climate (Tropical dry forest biome).

🌍Guam, Mariana Islands is at 13°28'N, 144°47'E, 75 m (247 ft). Check the location on the map.

Guam Climate Table

Average Max Temperature °C ( °F)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
30 (85) 30 (85) 30 (86) 31 (87) 31 (87) 31 (88) 31 (87) 31 (87) 31 (87) 31 (88) 31 (87) 30 (86) 31 (87)
Average Temperature °C ( °F)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
27 (80) 27 (80) 27 (81) 28 (82) 28 (82) 28 (83) 28 (82) 28 (82) 28 (82) 28 (82) 28 (82) 27 (81) 28 (81)
Average Min Temperature °C ( °F)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
24 (75) 24 (75) 24 (75) 24 (76) 25 (76) 25 (77) 25 (77) 25 (76) 25 (77) 25 (76) 25 (77) 24 (76) 25 (76)
Average Precipitation mm (in)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
113 (4) 95 (4) 76 (3) 99 (4) 154 (6) 164 (6) 268 (11) 349 (14) 343 (13) 307 (12) 208 (8) 137 (5) 2312 (91)
Number of Wet Days (probability of rain on a day %)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
14 (45) 12 (42) 12 (39) 10 (33) 14 (45) 18 (60) 24 (77) 23 (74) 23 (77) 23 (74) 20 (67) 18 (58) 211 (58)
Average Sunlight Hours/ Day
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
5h 56' 6h 43' 8h 30' 8h 18' 7h 52' 8h 06' 5h 38' 5h 46' 5h 08' 5h 25' 6h 18' 5h 54' 6h 37'
Average Daylight Hours/ Day
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
11h 25' 11h 40' 12h 02' 12h 25' 12h 44' 12h 53' 12h 49' 12h 33' 12h 11' 11h 48' 11h 29' 11h 20' 12h 00'
Percentage of Sunny (Cloudy) Daylight Hours
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
53 (47) 58 (42) 71 (29) 67 (33) 62 (38) 63 (37) 44 (56) 46 (54) 43 (57) 46 (54) 55 (45) 53 (47) 55 (45)
Sun altitude at solar noon on the 21st day (°).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
56.5 65.7 76.6 88.3 83.3 80 82.8 88.5 77.2 65.6 56.5 53.1 72.7


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