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Weather & Climate in Castletown, Australia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Castletown enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 67°F in January while summers reach 56°F in July / relatively mild seasonal variation. The area gets 328 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 26.9 inches (drier than the 38-inch national average). The city sits at an elevation of 26 feet.
Temperature
67°F Jan (19°C)
56°F Jul (13°C)
| Annual Average | 61.8°F |
| 14% above US avg | |
| January Average | 67°F (19°C) |
| July Average | 56°F (13°C) |
| Sunny Days | 328 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 2,807/sq mi |
| Coordinates | -33.8324°N, 121.9156°W |
| Timezone | Australia/Perth |
Precipitation & Snow
Air Quality
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Oct 19, 2001 | 112 km W of Nulsen, Australia | M5.0 | 116 km | 10 km |
| Nov 5, 1991 | 110 km NNE of Castletown, Australia | M4.2 | 110 km | 33 km |
| Oct 19, 2001 | 118 km WNW of Nulsen, Australia | M3.8 | 121 km | 10 km |
| Oct 19, 2001 | 115 km WNW of Nulsen, Australia | M3.5 | 118 km | 10 km |
| Feb 18, 2005 | 135 km NW of Castletown, Australia | M3.3 | 136 km | 0 km |
| Aug 18, 2001 | 75 km NE of Castletown, Australia | M3.0 | 75 km | 10 km |
| Oct 19, 2001 | 107 km WNW of Nulsen, Australia | M2.7 | 110 km | 10 km |
| Oct 19, 2001 | 136 km WNW of Nulsen, Australia | M2.6 | 139 km | 10 km |
| Oct 19, 2001 | 115 km WNW of Nulsen, Australia | M2.5 | 118 km | 10 km |
| Oct 19, 2001 | 90 km W of Nulsen, Australia | M2.5 | 95 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 67°F (19°C) | 0.9 in | |
| February | 71°F (22°C) | 1.0 in | Warmest |
| March | 68°F (20°C) | 1.2 in | |
| April | 64°F (18°C) | 1.6 in | |
| May | 59°F (15°C) | 2.7 in | |
| June | 55°F (13°C) | 2.9 in | |
| July | 56°F (13°C) | 3.4 in | Wettest |
| August | 54°F (12°C) | 3.0 in | Coldest |
| September | 57°F (14°C) | 2.1 in | |
| October | 60°F (16°C) | 1.8 in | |
| November | 64°F (18°C) | 1.3 in | |
| December | 68°F (20°C) | 0.7 in | Driest |
Castletown has a seasonal temperature swing of 17°F / from 54°F in August to 71°F in February. Total annual precipitation is 22.4 inches, with July being the wettest month (3.4") and December the driest (0.7").