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This climate climate zone covers from about 44°N to 50°N latitude mostly east of the 100th meridian in North America. However, it can be found as far north as 54°N, and further west in the Canadian Prairie Provinces and below 40°N in the high Appalachians. In Europe this subtype reaches its most northerly latitude at nearly 61° N. Areas featuring this subtype of the continental climate have an average temperature in the warmest month below 22°C (22°F). Summer high temperatures in this zone typically average between 21-28°C (70-82°F) during the daytime and the average temperatures in the coldest month are generally far below the -3 °C (27°F) mark.
The Köppen Climate Classification subtype for this climate is "Dfb". (Warm Summer Continental Climate).
The average temperature for the year in Helena is 45.4°F (7.4°C). The warmest month, on average, is July with an average temperature of 70.0°F (21.1°C). The coolest month on average is December, with an average temperature of 21.8°F (-5.7°C).
The highest recorded temperature in Helena is 105.0°F (40.6°C), which was recorded in July. The lowest recorded temperature in Helena is -42.0°F (-41.1°C), which was recorded in January.
The average amount of precipitation for the year in Helena is 11.2" (284.5 mm). The month with the most precipitation on average is June with 2.1" (53.3 mm) of precipitation. The month with the least precipitation on average is February with an average of 0.3" (7.6 mm). There are an average of 72.0 days of precipitation, with the most precipitation occurring in June with 10.0 days and the least precipitation occurring in February with 4.0 days.
In terms of liquid precipitation, there are an average of 96.0 days of rain, with the most rain occurring in May with 11.0 days of rain, and the least rain occurring in February with 6.0 days of rain.
In Helena, there's an average of 24.1" of snow (61.2 cm). The month with the most snow is December, with 5.6" of snow (14.2 cm).