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Weather & Climate in Johnston, Australia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Johnston has a warm climate with an average annual temperature of 81°F (27°C). Winters average 82°F in January while summers reach 78°F in July / relatively mild seasonal variation. The area gets 336 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 71.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 138 feet.
Temperature
82°F Jan (28°C)
78°F Jul (25°C)
| Annual Average | 81.3°F |
| 51% above US avg | |
| January Average | 82°F (28°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 336 days/yr |
Geography
| Elevation | 138 ft (42 m) |
| Area | 20.4 sq mi (52.9 km²) |
| Population Density | 100/sq mi |
| Coordinates | -12.4876°N, 131.0117°W |
| Timezone | Australia/Darwin |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Nov 12, 1999 | 36 km S of Bellamack, Australia | M3.9 | 40 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
7 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2026 | Fina | Category 3 | — | 59 km |
| 2018 | Marcus | Category 1 | 69 mph | 296 km |
| 2006 | Monica | Category 4 | 104 mph | 249 km |
| 2005 | Ingrid | Category 4 | 132 mph | 134 km |
| 2004 | Debbie | Category 1 | 69 mph | 292 km |
| 1999 | Thelma | Category 4 | 138 mph | 195 km |
| 1992 | Neville | Category 4 | 127 mph | 161 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 82°F (28°C) | 16.9 in | Wettest |
| February | 82°F (28°C) | 13.5 in | |
| March | 82°F (28°C) | 12.5 in | |
| April | 82°F (28°C) | 3.5 in | |
| May | 80°F (27°C) | 0.8 in | |
| June | 76°F (25°C) | 0.1 in | Coldest |
| July | 78°F (25°C) | 0.0 in | Driest |
| August | 78°F (25°C) | 0.2 in | |
| September | 82°F (28°C) | 0.6 in | |
| October | 84°F (29°C) | 2.8 in | |
| November | 85°F (29°C) | 5.3 in | Warmest |
| December | 84°F (29°C) | 10.3 in |
Johnston has a seasonal temperature swing of 9°F / from 76°F in June to 85°F in November. Total annual precipitation is 66.5 inches, with January being the wettest month (16.9") and July the driest (0.0").