Johnston Island, Johnston Atoll, United States Minor Outlying Islands Climate
Weather: 25.15°C/77.27°F, Wind SW at 8.61 km/h, 73% Humidity, 0% Chance of rain
(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.
Country | United States Minor Outlying Islands |
City | Johnston Atoll |
Longitude | -169.5336477 |
Latitude | 16.7295035 |
Attitude/Elevation | -14.34m (-47.05ft) |
Local time | Saturday 15:33 |
Annual high temperature | 27.63ºC (81.73ºF) |
Annual low temperature | 26.74ºC (80.13ºF) |
Average annual precip. | 75.54mm (2.97in) |
Warmest month | September (28.97ºC / 84.15ºF) |
Coldest Month | February (25.23ºC / 77.41ºF) |
Wettest Month | December (134.18mm / 5.28in) |
Driest Month | January (31.12mm / 1.23in) |
Number of days with rainfall (≥ 1.0 mm) | 151.57 days (41.53%) |
Days with no rain | 213.43 days (58.47%) |
Humidity | 80.66% |
Climate Johnston Island: Weather By Month
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Nov | Oct | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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) | 7.5 | 10.92 | 12.63 | 11.11 | 11.49 | 10.82 | 11.4 | 14.34 | 16.34 | 16.24 | 16.62 | 12.16 | 12.63 |
Average relative humidity (%) | 78.82 | 78.91 | 80.79 | 81.46 | 81.45 | 81.22 | 81.4 | 81.4 | 80.93 | 80.79 | 80.76 | 80.07 | 80.66 |
Mean monthly sunshine hours | 10.38 | 10.93 | 10.77 | 11.78 | 12.97 | 13.33 | 12.99 | 11.84 | 11.33 | 9.39 | 8.17 | 8.1 | 11.0 |
Climate Graph
The chart below shows the mean monthly temperature and precipitation of Johnston Island in recent years.
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
Temperature | Max | Average | Min | |
---|---|---|---|---|
Max Temperature | 28.2°C (82.76°F) | 27.3°C (81.14°F) | 25.07°C (77.13°F) | |
Avg Temperature | 28.2°C (82.76°F) | 27.05°C (80.69°F) | 25.07°C (77.13°F) | |
Min Temperature | 28.2°C (82.76°F) | 26.85°C (80.33°F) | 24.03°C (75.25°F) | |
Dew Point | Max | Average | Min | |
Dew Point | 25.07°C (77.13°F) | 23.12°C (73.62°F) | 19.85°C (67.73°F) | |
Precipitation | Max | Average | Min | Sum |
Precipitation | 21.41mm | 0.84in | 2.36mm | 0.09in | 0.0mm | 0in | 70.93mm | 2.79in |
Snowdepth | 0.0mm | 0in | 0.0mm | 0in | 0.0mm | 0in | 0.0mm | 0in |
Wind | Max | Average | Min | |
Wind | 44.92kmh | 27.91mph | 31.09kmh | 19.32mph | 8.36kmh | 5.19mph | |
Gust Wind | 59.54kmh | 37.0mph | 43.04kmh | 26.74mph | 11.49kmh | 7.14mph | |
Sea Level Pressure | Max | Average | Min | |
Sea Level Pressure | 21.41mb | 2.36mb | 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) |
2018-04-01 | 27.16 | 80.89 | 22.98 | 73.36 | 80 | 14.62 | 9.08 | 31.22 | 1057.14 | 2.51 | 0.1 |
2018-04-02 | 27.16 | 80.89 | 22.98 | 73.36 | 78 | 12.54 | 7.79 | 31.22 | 1057.14 | 0.0 | 0 |
2018-04-03 | 27.16 | 80.89 | 24.03 | 75.25 | 81 | 17.76 | 11.04 | 31.16 | 1055.05 | 2.51 | 0.1 |
2018-04-04 | 28.2 | 82.76 | 24.03 | 75.25 | 81 | 13.58 | 8.44 | 31.16 | 1055.05 | 1.36 | 0.05 |
2018-04-05 | 28.2 | 82.76 | 22.98 | 73.36 | 76 | 8.36 | 5.19 | 31.25 | 1058.18 | 1.15 | 0.05 |
2018-04-06 | 28.2 | 82.76 | 25.07 | 77.13 | 82 | 17.76 | 11.04 | 31.31 | 1060.27 | 0.0 | 0 |
2018-04-07 | 28.2 | 82.76 | 24.03 | 75.25 | 80 | 16.71 | 10.38 | 31.31 | 1060.27 | 3.87 | 0.15 |
2018-04-08 | 27.16 | 80.89 | 24.03 | 75.25 | 82 | 27.16 | 16.88 | 31.31 | 1060.27 | 2.82 | 0.11 |
2018-04-09 | 27.16 | 80.89 | 22.98 | 73.36 | 82 | 39.69 | 24.66 | 31.28 | 1059.22 | 1.46 | 0.06 |
2018-04-10 | 27.16 | 80.89 | 22.98 | 73.36 | 81 | 38.65 | 24.02 | 31.31 | 1060.27 | 4.39 | 0.17 |
2018-04-11 | 27.16 | 80.89 | 24.03 | 75.25 | 81 | 37.61 | 23.37 | 31.34 | 1061.31 | 21.41 | 0.84 |
2018-04-12 | 27.16 | 80.89 | 24.03 | 75.25 | 81 | 26.11 | 16.22 | 31.31 | 1060.27 | 5.95 | 0.23 |
2018-04-13 | 27.16 | 80.89 | 22.98 | 73.36 | 80 | 36.56 | 22.72 | 31.28 | 1059.22 | 2.4 | 0.09 |
2018-04-14 | 27.16 | 80.89 | 22.98 | 73.36 | 79 | 36.56 | 22.72 | 31.25 | 1058.18 | 1.46 | 0.06 |
2018-04-15 | 27.16 | 80.89 | 22.98 | 73.36 | 79 | 33.43 | 20.77 | 31.31 | 1060.27 | 3.87 | 0.15 |
2018-04-16 | 27.16 | 80.89 | 22.98 | 73.36 | 78 | 28.2 | 17.52 | 31.28 | 1059.22 | 3.45 | 0.14 |
2018-04-17 | 27.16 | 80.89 | 24.03 | 75.25 | 82 | 37.61 | 23.37 | 31.25 | 1058.18 | 10.03 | 0.39 |
2018-04-18 | 26.11 | 79.0 | 24.03 | 75.25 | 83 | 36.56 | 22.72 | 31.22 | 1057.14 | 1.15 | 0.05 |
2018-04-19 | 27.16 | 80.89 | 22.98 | 73.36 | 80 | 33.43 | 20.77 | 31.25 | 1058.18 | 0.0 | 0 |
2018-04-20 | 27.16 | 80.89 | 22.98 | 73.36 | 78 | 35.52 | 22.07 | 31.28 | 1059.22 | 0.0 | 0 |
2018-04-21 | 27.16 | 80.89 | 22.98 | 73.36 | 79 | 38.65 | 24.02 | 31.31 | 1060.27 | 0.31 | 0.01 |
2018-04-22 | 27.16 | 80.89 | 22.98 | 73.36 | 79 | 40.74 | 25.31 | 31.31 | 1060.27 | 0.0 | 0 |
2018-04-23 | 27.16 | 80.89 | 22.98 | 73.36 | 78 | 41.78 | 25.96 | 31.28 | 1059.22 | 0.0 | 0 |
2018-04-24 | 27.16 | 80.89 | 22.98 | 73.36 | 77 | 40.74 | 25.31 | 31.28 | 1059.22 | 0.0 | 0 |
2018-04-25 | 27.16 | 80.89 | 22.98 | 73.36 | 78 | 39.69 | 24.66 | 31.31 | 1060.27 | 0.0 | 0 |
2018-04-26 | 27.16 | 80.89 | 22.98 | 73.36 | 80 | 38.65 | 24.02 | 31.28 | 1059.22 | 0.0 | 0 |
2018-04-27 | 27.16 | 80.89 | 22.98 | 73.36 | 79 | 37.61 | 23.37 | 31.28 | 1059.22 | 0.31 | 0.01 |
2018-04-28 | 25.07 | 77.13 | 21.94 | 71.49 | 79 | 44.92 | 27.91 | 31.28 | 1059.22 | 0.52 | 0.02 |
2018-04-29 | 25.07 | 77.13 | 19.85 | 67.73 | 74 | 33.43 | 20.77 | 31.31 | 1060.27 | 0.0 | 0 |
2018-04-30 | 25.07 | 77.13 | 20.89 | 69.6 | 75 | 28.2 | 17.52 | 31.28 | 1059.22 | 0.0 | 0 |
Johnston Island 11 Year Historical Weather Data
- Johnston Island, Johnston Atoll weather in April 2010
- Johnston Island, Johnston Atoll weather in April 2011
- Johnston Island, Johnston Atoll weather in April 2012
- Johnston Island, Johnston Atoll weather in April 2013
- Johnston Island, Johnston Atoll weather in April 2014
- Johnston Island, Johnston Atoll weather in April 2015
- Johnston Island, Johnston Atoll weather in April 2016
- Johnston Island, Johnston Atoll weather in April 2017
- Johnston Island, Johnston Atoll weather in April 2019
- Johnston Island, Johnston Atoll weather in April 2020
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