Johnston Island, 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 Island Climate Summary

Located at an elevation of -14.34 meters (-47.05 feet) above sea level, Johnston Island has a Tropical rainforest climate climate (Classification: Af). The district’s yearly temperature is 27.35ºC (81.23ºF) and it is 1.02% higher than United States Minor Outlying Islands’s averages. Johnston Island typically receives about 75.54 millimeters (2.97 inches) of precipitation and has 151.57 rainy days (41.53% of the time) annually.

CountryUnited States Minor Outlying Islands
CityJohnston Atoll
Longitude-169.5336477
Latitude16.7295035
Attitude/Elevation-14.34m (-47.05ft)
Local timeThursday 06:49
Annual high temperature27.63ºC (81.73ºF)
Annual low temperature26.74ºC (80.13ºF)
Average annual precip.75.54mm (2.97in)
Warmest monthSeptember (28.97ºC / 84.15ºF)
Coldest MonthFebruary (25.23ºC / 77.41ºF)
Wettest MonthDecember (134.18mm / 5.28in)
Driest MonthJanuary (31.12mm / 1.23in)
Number of days with rainfall (≥ 1.0 mm)151.57 days (41.53%)
Days with no rain213.43 days (58.47%)
Humidity80.66%

Climate Johnston Island: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)28.2(82.76)27.16(80.89)28.2(82.76)28.2(82.76)28.2(82.76)30.29(86.52)30.29(86.52)30.29(86.52)31.34(88.41)30.29(86.52)30.29(86.52)29.25(84.65)31.34(88.41)
Average high °C (°F)26.64(79.95)26.15(79.07)26.22(79.2)26.68(80.02)27.27(81.09)27.92(82.26)28.35(83.03)28.85(83.93)28.97(84.15)28.77(83.79)28.3(82.94)27.41(81.34)27.63(81.73)
Daily mean °C (°F)26.3(79.34)25.84(78.51)25.92(78.66)26.41(79.54)26.99(80.58)27.74(81.93)28.08(82.54)28.51(83.32)28.7(83.66)28.5(83.3)28.03(82.45)27.17(80.91)27.35(81.23)
Average low °C (°F)25.67(78.21)25.23(77.41)25.25(77.45)25.81(78.46)26.5(79.7)27.24(81.03)27.56(81.61)27.91(82.24)28.11(82.6)27.82(82.08)27.33(81.19)26.51(79.72)26.74(80.13)
Record low °C (°F)17.76(63.97)16.71(62.08)17.76(63.97)17.76(63.97)18.8(65.84)18.8(65.84)20.89(69.6)19.85(67.73)19.85(67.73)19.85(67.73)19.85(67.73)18.8(65.84)16.71(62.08)
Average precipitation mm (inches)31.12(1.23)63.22(2.49)53.96(2.12)54.25(2.14)59.73(2.35)31.24(1.23)59.15(2.33)101.89(4.01)102.79(4.05)104.19(4.1)110.82(4.36)134.18(5.28)75.55(2.97)
Average precipitation days (≥ 1.0 mm)7.510.9212.6311.1111.4910.8211.414.3416.3416.2416.6212.1612.63
Average relative humidity (%)78.8278.9180.7981.4681.4581.2281.481.480.9380.7980.7680.0780.66
Mean monthly sunshine hours10.3810.9310.7711.7812.9713.3312.9911.8411.339.398.178.111.0

Climate Graph

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

Johnston Island

Johnston Island Temperature by Month

September
28.7°C | 83.66°F
August
28.51°C | 83.32°F
October
28.5°C | 83.3°F
July
28.08°C | 82.54°F
November
28.03°C | 82.45°F
June
27.74°C | 81.93°F
December
27.17°C | 80.91°F
May
26.99°C | 80.58°F
April
26.41°C | 79.54°F
January
26.3°C | 79.34°F
March
25.92°C | 78.66°F
February
25.84°C | 78.51°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 Temperature28.2°C (82.76°F)27.3°C (81.14°F)25.07°C (77.13°F)
Avg Temperature28.2°C (82.76°F)27.05°C (80.69°F)25.07°C (77.13°F)
Min Temperature28.2°C (82.76°F)26.85°C (80.33°F)24.03°C (75.25°F)
Dew PointMaxAverageMin
Dew Point25.07°C (77.13°F)23.12°C (73.62°F)19.85°C (67.73°F)
PrecipitationMaxAverageMinSum
Precipitation21.41mm | 0.84in2.36mm | 0.09in0.0mm | 0in70.93mm | 2.79in
Snowdepth0.0mm | 0in0.0mm | 0in0.0mm | 0in0.0mm | 0in
WindMaxAverageMin
Wind44.92kmh | 27.91mph31.09kmh | 19.32mph8.36kmh | 5.19mph
Gust Wind59.54kmh | 37.0mph43.04kmh | 26.74mph11.49kmh | 7.14mph
Sea Level PressureMaxAverageMin
Sea Level Pressure21.41mb2.36mb0.0mb
Johnston Island

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
April° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2018-04-0127.16 | 80.8922.98 | 73.368014.62 | 9.0831.22 | 1057.142.51 | 0.1
2018-04-0227.16 | 80.8922.98 | 73.367812.54 | 7.7931.22 | 1057.140.0 | 0
2018-04-0327.16 | 80.8924.03 | 75.258117.76 | 11.0431.16 | 1055.052.51 | 0.1
2018-04-0428.2 | 82.7624.03 | 75.258113.58 | 8.4431.16 | 1055.051.36 | 0.05
2018-04-0528.2 | 82.7622.98 | 73.36768.36 | 5.1931.25 | 1058.181.15 | 0.05
2018-04-0628.2 | 82.7625.07 | 77.138217.76 | 11.0431.31 | 1060.270.0 | 0
2018-04-0728.2 | 82.7624.03 | 75.258016.71 | 10.3831.31 | 1060.273.87 | 0.15
2018-04-0827.16 | 80.8924.03 | 75.258227.16 | 16.8831.31 | 1060.272.82 | 0.11
2018-04-0927.16 | 80.8922.98 | 73.368239.69 | 24.6631.28 | 1059.221.46 | 0.06
2018-04-1027.16 | 80.8922.98 | 73.368138.65 | 24.0231.31 | 1060.274.39 | 0.17
2018-04-1127.16 | 80.8924.03 | 75.258137.61 | 23.3731.34 | 1061.3121.41 | 0.84
2018-04-1227.16 | 80.8924.03 | 75.258126.11 | 16.2231.31 | 1060.275.95 | 0.23
2018-04-1327.16 | 80.8922.98 | 73.368036.56 | 22.7231.28 | 1059.222.4 | 0.09
2018-04-1427.16 | 80.8922.98 | 73.367936.56 | 22.7231.25 | 1058.181.46 | 0.06
2018-04-1527.16 | 80.8922.98 | 73.367933.43 | 20.7731.31 | 1060.273.87 | 0.15
2018-04-1627.16 | 80.8922.98 | 73.367828.2 | 17.5231.28 | 1059.223.45 | 0.14
2018-04-1727.16 | 80.8924.03 | 75.258237.61 | 23.3731.25 | 1058.1810.03 | 0.39
2018-04-1826.11 | 79.024.03 | 75.258336.56 | 22.7231.22 | 1057.141.15 | 0.05
2018-04-1927.16 | 80.8922.98 | 73.368033.43 | 20.7731.25 | 1058.180.0 | 0
2018-04-2027.16 | 80.8922.98 | 73.367835.52 | 22.0731.28 | 1059.220.0 | 0
2018-04-2127.16 | 80.8922.98 | 73.367938.65 | 24.0231.31 | 1060.270.31 | 0.01
2018-04-2227.16 | 80.8922.98 | 73.367940.74 | 25.3131.31 | 1060.270.0 | 0
2018-04-2327.16 | 80.8922.98 | 73.367841.78 | 25.9631.28 | 1059.220.0 | 0
2018-04-2427.16 | 80.8922.98 | 73.367740.74 | 25.3131.28 | 1059.220.0 | 0
2018-04-2527.16 | 80.8922.98 | 73.367839.69 | 24.6631.31 | 1060.270.0 | 0
2018-04-2627.16 | 80.8922.98 | 73.368038.65 | 24.0231.28 | 1059.220.0 | 0
2018-04-2727.16 | 80.8922.98 | 73.367937.61 | 23.3731.28 | 1059.220.31 | 0.01
2018-04-2825.07 | 77.1321.94 | 71.497944.92 | 27.9131.28 | 1059.220.52 | 0.02
2018-04-2925.07 | 77.1319.85 | 67.737433.43 | 20.7731.31 | 1060.270.0 | 0
2018-04-3025.07 | 77.1320.89 | 69.67528.2 | 17.5231.28 | 1059.220.0 | 0

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