October in Helena: afternoons around 51°F, nights around 30°F. A box that waits outside overnight can freeze, so jams, sauces and fresh fruit do better at an office or a front desk than on a porch.
Freezing nights (January, February, March, April, October, November and December). The average low reaches 13°F in January. Jams, sauces and fresh fruit should not spend a night outside; offices, senior residences and hospitals all receive indoors.
Wettest months (June and May). Around 2.7 and 2.3 inches of rain on average. Boxes are sealed, not waterproof: a covered porch or a workplace address keeps the packaging presentable.
Normals: NOAA National Centers for Environmental Information, 1991 to 2020, Austin 1 W station, 8.4 miles from Helena. Heat: average high 85°F or more. Freezing: average low 32°F or less. Snow: 2 inches or more in the month. Wettest: the two months with the most rain.