Best year time to visit Helena

General weather information about Helena

Average annual temperature is 7.2 °C

Absolute maximum temperature: 35.8 °C

Absolute minimum temperature: -28.4 °C

Number of sunny days: 205

Number of rainy days: 110

Number of snow days: 50

Average annual precipitation: 370 mm

Look at detailed online map of Helena

* Weather data for Helena United States is based on climate observations for 2023 year

Helena air temperature forecast for each month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Absolute maximum temperature (°C) 9.1 10.5 11 23.8 28.2 30.3 34.8 35.8 30.3 22.8 16 14.8
Average daytime temperature (°C) 1 3.2 3.2 11.1 21.7 21.9 29.9 28.8 22.4 13 8 4.6
Average temperature (°C) -4.4 -3.7 -3.6 3.5 14.2 15.4 21.6 20.3 14.5 6.1 1.6 -0.6
Average night temperature (°C) -8.9 -8.7 -8.2 -2.7 7.2 9.2 12.7 13.4 8 1.3 -3 -4.1
Absolute minimum temperature (°C) -28.4 -27.2 -14.4 -11.6 0.6 1.4 7.3 9.8 2.3 -15.2 -9 -11.1

Helena monthly weather indicators

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daylight maximum duration (h) 9.6 11 12.8 14.3 15.6 15.8 15.8 14.9 13.4 11.7 10.1 8.9
Daylight mean duration (h) 9.1 10.3 11.9 13.6 15 15.8 15.4 14.2 12.6 10.9 9.4 8.7
Daylight minimum duration (h) 8.7 9.7 11.1 12.8 14.4 15.6 14.9 13.4 11.8 10.1 8.9 8.6
Sunshine mean duration (h) 5.6 6.6 8.3 9.9 11.8 11.9 13.8 11.6 10.1 7.4 6.7 5.8
Precipitation (mm) 23 11 41 46 40 44 3 44 56 39 14 10
Sunny days 17 17 14 12 9 10 23 23 19 19 21 21
Rainy days 2 3 2 10 22 20 8 8 11 10 9 5
Snow days 12 8 15 8 2 5

Helena - weather forecast by months

January February March April May June July August September October November December

Best time to visit Helena:

The best time to visit Helena during the most sunny months:

  • May — 11.8(h)
  • June — 11.9(h)
  • July — 13.8(h)
  • August — 11.6(h)

Months with the longest average daylight duration in Helena:

  • June — 15.8(h)
  • July — 15.4(h)

The largest precipitation sum in Helena is at

  • March — 41(mm)
  • April — 46(mm)
  • May — 40(mm)
  • June — 44(mm)
  • August — 44(mm)
  • September — 56(mm)
  • October — 39(mm)

Weather forecast in the closest to Helena admin centers