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Jamestown Climate & Temperature

  • Jamestown, Saint Helena is at 15°55'S, 5°43'W, 12 m (39 ft). See map.
  • Jamestown has a subtropical desert / low-latitude arid hot climate (Köppen-Geiger classification: BWh)
  • The mean temperature is 21.8 degrees Celsius (71.3 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 4 °C (7.2°F). This indicates that the continentality type is hyperoceanic, subtype truly hyperoceanic. Jamestown Climate Graph
  • Total annual Precipitation averages 137 mm (5.4 inches) which is equivalent to 137 Litres/m² (3.36 Gallons/ft²).
  • Were you to burrow down through the centre of the Earth from Jamestown you would pop up nearest to the climate station at Wake Island, Usa where you would find a Tropical wet and dry/ savanna climate.

Jamestown Climate Table

  Climate Variable Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Annual
 
Average Max Temperature °C ( °F) 22 (72) 22 (72) 22 (72) 23 (73) 23 (73) 24 (75) 27 (81) 27 (81) 28 (82) 27 (81) 24 (75) 23 (73) 24 (76)
 
Average Temperature °C ( °F) 20 (68) 20 (68) 20 (68) 20 (68) 21 (70) 22 (72) 24 (75) 24 (75) 24 (75) 24 (75) 22 (72) 21 (70) 22 (71)
 
Average Min Temperature °C ( °F) 17 (63) 17 (63) 17 (63) 18 (64) 18 (64) 19 (66) 21 (70) 21 (70) 22 (72) 21 (70) 19 (66) 18 (64) 19 (66)
 
Average Precipitation mm (in) 33 (1) 10 (0) 5 (0) 2 (0) 0 (0) 3 (0) 8 (0) 10 (0) 20 (1) 10 (0) 18 (1) 18 (1) 137 (5)
Number of Wet Days (probability of rain on a day %) 8 (26) 3 (10) 2 (7) 1 (3) 0 (0) 1 (3) 4 (13) 4 (14) 5 (16) 3 (10) 4 (13) 6 (20) 41 (11)
Average Daylight Hours/ Day 11h 16' 11h 35' 12h 02' 12h 29' 12h 51' 13h 02' 12h 57' 12h 38' 12h 12' 11h 45' 11h 22' 11h 11' 12h 00'
Sun altitude at solar noon on the 21st day (°). 53.6 62 73.4 83.6 84.7 82.5 85.2 83.6 73.7 62.2 53.9 50.7 70.8

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