Koster, South Africa

Full City Profile

23,361 Population
5,315 ft Elevation 1,620 meters
61°F Avg Temperature 16°C
Koster enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 70°F in January while summers reach 49°F in July. Annual precipitation totals 26.4 inches. The area receives 0.0 inches of snow annually.

Temperature

70°F Jan (21°C) 49°F Jul (9°C)
Annual Average61.4°F
14% above US avg
January Average70°F (21°C)
July Average49°F (9°C)

Geography

Elevation5,315 ft (1,620 m)
Coordinates25.8630°S, 26.8976°E
TimezoneAfrica/Johannesburg

Precipitation & Snow

Annual Rainfall 26.4"
31% below US avg
Snowfall 0.0"
Wettest Month (Jan) 5.00"
Driest Month (Jul) 0.20"

Air Quality

Earthquake History

963 earthquakes (M2.5+) within 150 km since 1990. Strongest: M5.4. Most recent: M4.8 on Jul 10, 2025.

Aug 5, 2014 3 km ESE of Orkney, South Africa M5.4 127 km
Apr 3, 2017 7 km SSE of Stilfontein, South Africa M5.2 117 km
Feb 10, 1997 5 km SSE of Orkney, South Africa M5.2 130 km
Nov 3, 1991 5 km SE of Klerksdorp, South Africa M5.1 116 km
Dec 1, 1991 2 km S of Klerksdorp, South Africa M5.0 115 km
Mar 16, 2009 8 km ENE of Orkney, South Africa M5.0 122 km
May 27, 2002 4 km ENE of Orkney, South Africa M5.0 124 km
Jul 21, 1997 4 km W of Klerksdorp, South Africa M5.0 114 km
Mar 9, 2005 7 km SSE of Stilfontein, South Africa M5.0 117 km
Jun 14, 2010 8 km NNW of Fochville, South Africa M5.0 84 km
Dec 11, 1997 7 km SSW of Klerksdorp, South Africa M4.9 119 km
Dec 5, 1998 9 km NNE of Fochville, South Africa M4.9 87 km
Aug 6, 2000 8 km SSW of Westonaria, South Africa M4.9 91 km
Jun 11, 2023 Gauteng, South Africa M4.9 136 km
Sep 6, 2004 17 km WNW of Klerksdorp, South Africa M4.9 109 km
Nov 25, 1995 South Africa M4.9 119 km
Jul 31, 2001 8 km SW of Klerksdorp, South Africa M4.9 120 km
Feb 17, 2005 13 km WSW of Klerksdorp, South Africa M4.9 122 km
Mar 7, 1992 14 km W of Fochville, South Africa M4.9 85 km
Jun 15, 2014 8 km E of Orkney, South Africa M4.9 126 km
Source: USGS (M2.5+, 1990-2025)

Monthly Weather

Month Avg Temperature Precipitation Summary
January 70°F (21°C) 5.0 in Warmest, Wettest
February 69°F (20°C) 3.9 in
March 66°F (19°C) 3.6 in
April 61°F (16°C) 1.9 in
May 55°F (13°C) 0.6 in
June 50°F (10°C) 0.2 in
July 49°F (9°C) 0.2 in Coldest, Driest
August 54°F (12°C) 0.3 in
September 61°F (16°C) 0.9 in
October 66°F (19°C) 2.2 in
November 68°F (20°C) 3.3 in
December 69°F (21°C) 4.4 in

Koster has a seasonal temperature swing of 21°F / from 49°F in July to 70°F in January. Total annual precipitation is 26.4 inches, with January being the wettest month (5.0") and July the driest (0.2").

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