Ascension, Saint Helena Climate

Weather: 0°C/0°F, Wind SW at 0 km/h, 0% Humidity, 0% Chance of rain

Saint Helena
(Photo by JJ Shev on Unsplash)
Contents

Ascension Climate Summary

Located at an elevation of 521.3 meters (1710.3 feet) above sea level, Ascension has a Tropical and subtropical desert climate climate (Classification: Bwh). The city’s yearly temperature is 24.97ºC (76.95ºF) and it is 4.47% higher than Saint Helena’s averages. Ascension typically receives about 29.73 millimeters (1.17 inches) of precipitation and has 143.18 rainy days (39.23% of the time) annually.

Country Saint Helena
Longitude -14.3559158
Latitude -7.9467166
Attitude/Elevation 521.3m (1710.3ft)
Local time Wednesday 12:28
Annual high temperature 25.4ºC (77.72ºF)
Annual low temperature 24.27ºC (75.69ºF)
Average annual precip. 29.73mm (1.17in)
Warmest month April (27.29ºC / 81.12ºF)
Coldest Month September (22.71ºC / 72.88ºF)
Wettest Month July (42.03mm / 1.65in)
Driest Month January (17.47mm / 0.69in)
Number of days with rainfall (≥ 1.0 mm) 143.18 days (39.23%)
Days with no rain 221.82 days (60.77%)
Humidity 78.12%

Climate Ascension: Monthly Averages

Month Jan Feb Mar Apr May Jun Jul Aug Sep Nov Oct Dec Year
Record high °C (°F) 27.0(80.6) 28.0(82.4) 29.0(84.2) 29.0(84.2) 28.0(82.4) 28.0(82.4) 27.0(80.6) 26.0(78.8) 25.0(77.0) 25.0(77.0) 25.0(77.0) 26.0(78.8) 29.0(84.2)
Average high °C (°F) 25.59(78.06) 26.4(79.52) 27.21(80.98) 27.29(81.12) 26.74(80.13) 25.9(78.62) 25.04(77.07) 24.24(75.63) 23.83(74.89) 23.89(75.0) 24.11(75.4) 24.54(76.17) 25.4(77.72)
Daily mean °C (°F) 25.11(77.2) 25.94(78.69) 26.72(80.1) 26.91(80.44) 26.36(79.45) 25.5(77.9) 24.57(76.23) 23.83(74.89) 23.37(74.07) 23.44(74.19) 23.73(74.71) 24.12(75.42) 24.97(76.95)
Average low °C (°F) 24.36(75.85) 25.32(77.58) 26.05(78.89) 26.28(79.3) 25.58(78.04) 24.91(76.84) 23.79(74.82) 23.21(73.78) 22.71(72.88) 22.76(72.97) 23.0(73.4) 23.28(73.9) 24.27(75.69)
Record low °C (°F) 15.0(59.0) 16.0(60.8) 17.0(62.6) 17.0(62.6) 18.0(64.4) 16.0(60.8) 15.0(59.0) 14.0(57.2) 13.0(55.4) 13.0(55.4) 14.0(57.2) 14.0(57.2) 13.0(55.4)
Average precipitation mm (inches) 17.47(0.69) 18.17(0.72) 27.48(1.08) 34.0(1.34) 28.48(1.12) 34.42(1.36) 42.03(1.65) 40.92(1.61) 35.76(1.41) 31.5(1.24) 24.97(0.98) 21.53(0.85) 29.73(1.17)
Average precipitation days (≥ 1.0 mm) 4.91 4.09 5.36 7.82 9.82 14.09 18.27 21.18 19.82 16.91 11.91 9.0 11.93
Average relative humidity (%) 79.33 79.35 78.51 77.42 76.15 75.05 75.32 77.44 79.23 80.11 80.29 79.19 78.12
Mean monthly sunshine hours 10.14 10.39 10.6 10.15 9.76 9.76 9.4 8.98 8.54 8.35 8.54 8.83 9.45

Climate Graph

The chart below shows the mean monthly temperature and precipitation of Ascension in recent years.

Ascension Temperature by Month

April
26.91°C | 80.44°F
March
26.72°C | 80.1°F
May
26.36°C | 79.45°F
February
25.94°C | 78.69°F
June
25.5°C | 77.9°F
January
25.11°C | 77.2°F
July
24.57°C | 76.23°F
December
24.12°C | 75.42°F
August
23.83°C | 74.89°F
November
23.73°C | 74.71°F
October
23.44°C | 74.19°F
September
23.37°C | 74.07°F

Historical Data

Summary
  • 2010
  • 2011
  • 2012
  • 2013
  • 2014
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
Temperature Max Average Min
Max Temperature 28.0°C (82.4°F) 27.27°C (81.09°F) 26.0°C (78.8°F)
Avg Temperature 28.0°C (82.4°F) 26.7°C (80.06°F) 26.0°C (78.8°F)
Min Temperature 27.0°C (80.6°F) 21.93°C (71.47°F) 17.0°C (62.6°F)
Dew Point Max Average Min
Dew Point 24.0°C (75.2°F) 22.8°C (73.04°F) 21.0°C (69.8°F)
Precipitation Max Average Min Sum
Precipitation 4.8mm | 0.19in 1.51mm | 0.06in 0.0mm | 0in 45.2mm | 1.78in
Snowdepth 0.0mm | 0in 0.0mm | 0in 0.0mm | 0in 0.0mm | 0in
Wind Max Average Min
Wind 35.0kmh | 21.75mph 25.2kmh | 15.66mph 17.0kmh | 10.56mph
Gust Wind 49.0kmh | 30.45mph 34.43kmh | 21.39mph 23.0kmh | 14.29mph
Sea Level Pressure Max Average Min
Sea Level Pressure 4.8mb 1.51mb 0.0mb

Daily Observations

Time Temperature Dew Point Humidity Wind Speed Pressure Precipitation
April ° C | ° F ° C | ° F % Kph | Mph Hg | Mb Total (mm/in)
2020-04-01 27 | 80.6 24 | 75.2 81 29 | 18.02 29.88 | 1012 1.8 | 0.07
2020-04-02 27 | 80.6 23 | 73.4 78 28 | 17.4 29.88 | 1012 1.3 | 0.05
2020-04-03 27 | 80.6 22 | 71.6 76 24 | 14.91 29.88 | 1012 0.4 | 0.02
2020-04-04 27 | 80.6 21 | 69.8 70 18 | 11.18 29.88 | 1012 0.0 | 0.0
2020-04-05 27 | 80.6 22 | 71.6 74 22 | 13.67 29.88 | 1012 0.0 | 0.0
2020-04-06 27 | 80.6 23 | 73.4 79 22 | 13.67 29.91 | 1013 1.1 | 0.04
2020-04-07 27 | 80.6 23 | 73.4 76 27 | 16.78 29.88 | 1012 0.6 | 0.02
2020-04-08 27 | 80.6 22 | 71.6 75 25 | 15.53 29.88 | 1012 0.5 | 0.02
2020-04-09 27 | 80.6 22 | 71.6 73 17 | 10.56 29.85 | 1011 1.7 | 0.07
2020-04-10 26 | 78.8 23 | 73.4 81 26 | 16.16 29.88 | 1012 2.1 | 0.08
2020-04-11 27 | 80.6 24 | 75.2 81 28 | 17.4 29.88 | 1012 2.1 | 0.08
2020-04-12 27 | 80.6 24 | 75.2 81 30 | 18.64 29.88 | 1012 0.9 | 0.04
2020-04-13 26 | 78.8 23 | 73.4 81 28 | 17.4 29.88 | 1012 2.6 | 0.1
2020-04-14 26 | 78.8 23 | 73.4 78 27 | 16.78 29.85 | 1011 1.9 | 0.07
2020-04-15 27 | 80.6 23 | 73.4 77 30 | 18.64 29.88 | 1012 1.1 | 0.04
2020-04-16 27 | 80.6 23 | 73.4 77 35 | 21.75 29.88 | 1012 1.8 | 0.07
2020-04-17 26 | 78.8 22 | 71.6 75 19 | 11.81 29.88 | 1012 0.2 | 0.01
2020-04-18 27 | 80.6 23 | 73.4 76 20 | 12.43 29.91 | 1013 1.3 | 0.05
2020-04-19 26 | 78.8 23 | 73.4 77 18 | 11.18 29.94 | 1014 2.3 | 0.09
2020-04-20 26 | 78.8 23 | 73.4 79 27 | 16.78 29.91 | 1013 2.6 | 0.1
2020-04-21 28 | 82.4 23 | 73.4 78 30 | 18.64 29.91 | 1013 2.1 | 0.08
2020-04-22 27 | 80.6 23 | 73.4 78 32 | 19.88 29.88 | 1012 3.0 | 0.12
2020-04-23 26 | 78.8 21 | 69.8 72 28 | 17.4 29.88 | 1012 0.2 | 0.01
2020-04-24 26 | 78.8 21 | 69.8 71 22 | 13.67 29.88 | 1012 0.5 | 0.02
2020-04-25 26 | 78.8 22 | 71.6 75 22 | 13.67 29.91 | 1013 0.8 | 0.03
2020-04-26 27 | 80.6 23 | 73.4 77 23 | 14.29 29.91 | 1013 1.1 | 0.04
2020-04-27 27 | 80.6 23 | 73.4 79 22 | 13.67 29.91 | 1013 2.7 | 0.11
2020-04-28 26 | 78.8 24 | 75.2 83 27 | 16.78 29.91 | 1013 2.2 | 0.09
2020-04-29 27 | 80.6 24 | 75.2 81 22 | 13.67 29.94 | 1014 4.8 | 0.19
2020-04-30 27 | 80.6 24 | 75.2 82 28 | 17.4 29.94 | 1014 1.5 | 0.06

Ascension 10 Year Historical Weather Data

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