Johnston Atoll, United States Minor Outlying Islands Climate

Weather: 26.88°C/80.38°F, Wind SW at 8.03 km/h, 80% Humidity, 0.18% Chance of rain

United States Minor Outlying Islands
(Photo by Ubey Ahmed on Unsplash)

Johnston Atoll Climate Summary

Located at an elevation of -14.34 meters (-47.05 feet) above sea level, Johnston Atoll has a Tropical rainforest climate climate (Classification: Af). The city’s yearly temperature is 26.18ºC (79.12ºF) and it is -0.15% lower than United States Minor Outlying Islands’s averages. Johnston Atoll typically receives about 72.32 millimeters (2.85 inches) of precipitation and has 145.1 rainy days (39.75% of the time) annually.

CountryUnited States Minor Outlying Islands
Longitude-169.5336477
Latitude16.7295035
Attitude/Elevation-14.34m (-47.05ft)
Local timeWednesday 19:06
Annual high temperature26.45ºC (79.61ºF)
Annual low temperature25.6ºC (78.08ºF)
Average annual precip.72.32mm (2.85in)
Warmest monthSeptember (27.73ºC / 81.91ºF)
Coldest MonthFebruary (24.15ºC / 75.47ºF)
Wettest MonthDecember (128.45mm / 5.06in)
Driest MonthJanuary (29.79mm / 1.17in)
Number of days with rainfall (≥ 1.0 mm)145.1 days (39.75%)
Days with no rain219.9 days (60.25%)
Humidity77.22%

Climate Johnston Atoll: Monthly Averages

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)27.0(80.6)26.0(78.8)27.0(80.6)27.0(80.6)27.0(80.6)29.0(84.2)29.0(84.2)29.0(84.2)30.0(86.0)29.0(84.2)29.0(84.2)28.0(82.4)30.0(86.0)
Average high °C (°F)25.5(77.9)25.03(77.05)25.1(77.18)25.54(77.97)26.11(79.0)26.73(80.11)27.14(80.85)27.62(81.72)27.73(81.91)27.54(81.57)27.09(80.76)26.24(79.23)26.45(79.61)
Daily mean °C (°F)25.18(77.32)24.74(76.53)24.81(76.66)25.28(77.5)25.84(78.51)26.56(79.81)26.88(80.38)27.29(81.12)27.47(81.45)27.28(81.1)26.83(80.29)26.01(78.82)26.18(79.12)
Average low °C (°F)24.57(76.23)24.15(75.47)24.17(75.51)24.71(76.48)25.37(77.67)26.08(78.94)26.38(79.48)26.72(80.1)26.91(80.44)26.63(79.93)26.16(79.09)25.38(77.68)25.6(78.08)
Record low °C (°F)17.0(62.6)16.0(60.8)17.0(62.6)17.0(62.6)18.0(64.4)18.0(64.4)20.0(68.0)19.0(66.2)19.0(66.2)19.0(66.2)19.0(66.2)18.0(64.4)16.0(60.8)
Average precipitation mm (inches)29.79(1.17)60.52(2.38)51.66(2.03)51.93(2.04)57.18(2.25)29.91(1.18)56.62(2.23)97.54(3.84)98.4(3.87)99.74(3.93)106.09(4.18)128.45(5.06)72.32(2.85)
Average precipitation days (≥ 1.0 mm)7.1810.4512.0910.6411.010.3610.9113.7315.6415.5515.9111.6412.09
Average relative humidity (%)75.4575.5477.3477.9877.9777.7577.9277.9277.4777.3477.3176.6577.22
Mean monthly sunshine hours9.9410.4610.3111.2812.4212.7612.4411.3310.858.997.827.7510.53

Climate Graph

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

Johnston Atoll

Johnston Atoll Temperature by Month

September
27.47°C | 81.45°F
August
27.29°C | 81.12°F
October
27.28°C | 81.1°F
July
26.88°C | 80.38°F
November
26.83°C | 80.29°F
June
26.56°C | 79.81°F
December
26.01°C | 78.82°F
May
25.84°C | 78.51°F
April
25.28°C | 77.5°F
January
25.18°C | 77.32°F
March
24.81°C | 76.66°F
February
24.74°C | 76.53°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
TemperatureMaxAverageMin
Max Temperature27.0°C (80.6°F)26.93°C (80.47°F)26.0°C (78.8°F)
Avg Temperature27.0°C (80.6°F)26.73°C (80.11°F)26.0°C (78.8°F)
Min Temperature27.0°C (80.6°F)26.43°C (79.57°F)26.0°C (78.8°F)
Dew PointMaxAverageMin
Dew Point24.0°C (75.2°F)22.8°C (73.04°F)22.0°C (71.6°F)
PrecipitationMaxAverageMinSum
Precipitation5.4mm | 0.21in0.37mm | 0.01in0.0mm | 0in11.0mm | 0.43in
Snowdepth0.0mm | 0in0.0mm | 0in0.0mm | 0in0.0mm | 0in
WindMaxAverageMin
Wind35.0kmh | 21.75mph26.37kmh | 16.39mph19.0kmh | 11.81mph
Gust Wind49.0kmh | 30.45mph36.5kmh | 22.68mph26.0kmh | 16.16mph
Sea Level PressureMaxAverageMin
Sea Level Pressure5.4mb0.37mb0.0mb
Johnston Atoll

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
June° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2018-06-0126 | 78.823 | 73.48223 | 14.2929.94 | 10140.1 | 0.0
2018-06-0226 | 78.822 | 71.68019 | 11.8129.88 | 10120.0 | 0.0
2018-06-0327 | 80.623 | 73.48222 | 13.6729.85 | 10115.4 | 0.21
2018-06-0427 | 80.624 | 75.28535 | 21.7529.97 | 10150.0 | 0.0
2018-06-0527 | 80.623 | 73.48134 | 21.1330.0 | 10160.1 | 0.0
2018-06-0626 | 78.823 | 73.48129 | 18.0229.97 | 10150.1 | 0.0
2018-06-0726 | 78.822 | 71.67926 | 16.1629.97 | 10150.0 | 0.0
2018-06-0826 | 78.823 | 73.47927 | 16.7830.0 | 10160.0 | 0.0
2018-06-0927 | 80.623 | 73.48230 | 18.6430.03 | 10170.1 | 0.0
2018-06-1026 | 78.823 | 73.48226 | 16.1630.0 | 10160.0 | 0.0
2018-06-1127 | 80.623 | 73.47826 | 16.1629.94 | 10140.0 | 0.0
2018-06-1227 | 80.622 | 71.67722 | 13.6729.91 | 10130.0 | 0.0
2018-06-1326 | 78.822 | 71.67823 | 14.2929.94 | 10140.1 | 0.0
2018-06-1427 | 80.623 | 73.47720 | 12.4329.94 | 10140.0 | 0.0
2018-06-1526 | 78.822 | 71.67621 | 13.0529.94 | 10140.0 | 0.0
2018-06-1627 | 80.622 | 71.67822 | 13.6729.94 | 10140.0 | 0.0
2018-06-1727 | 80.622 | 71.67626 | 16.1629.97 | 10150.1 | 0.0
2018-06-1827 | 80.622 | 71.67628 | 17.430.0 | 10160.1 | 0.0
2018-06-1927 | 80.622 | 71.67825 | 15.5329.97 | 10150.8 | 0.03
2018-06-2027 | 80.623 | 73.47820 | 12.4329.94 | 10140.2 | 0.01
2018-06-2127 | 80.623 | 73.47920 | 12.4329.91 | 10130.0 | 0.0
2018-06-2227 | 80.623 | 73.47926 | 16.1629.91 | 10130.1 | 0.0
2018-06-2327 | 80.623 | 73.48032 | 19.8829.94 | 10141.5 | 0.06
2018-06-2427 | 80.623 | 73.47929 | 18.0229.94 | 10140.1 | 0.0
2018-06-2527 | 80.623 | 73.47931 | 19.2629.94 | 10140.3 | 0.01
2018-06-2627 | 80.622 | 71.67729 | 18.0229.94 | 10140.0 | 0.0
2018-06-2727 | 80.623 | 73.47932 | 19.8829.91 | 10130.0 | 0.0
2018-06-2827 | 80.624 | 75.28133 | 20.5129.91 | 10130.4 | 0.02
2018-06-2927 | 80.624 | 75.28229 | 18.0229.91 | 10130.0 | 0.0
2018-06-3027 | 80.624 | 75.28226 | 16.1629.91 | 10131.5 | 0.06

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