Climate almanac

Perth

Ontario, CA · 44.90°, -76.25°

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What is the climate like in Perth?

Perth is warmest in July, when daily highs average 80°F (27°C), and coolest in January, when lows fall to about 12°F (-11°C). The wettest month is typically April and the driest is September; the year sees roughly 41 in of precipitation.

  • Warmest monthJuly — average high 80°F (27°C)
  • Coolest monthJanuary — average low 12°F (-11°C)
  • Wettest monthApril (4.2 in)
  • Driest monthSeptember (2.1 in)
  • Annual precipitation41 in