Helena, MT

The extremes of a 144-year record (1881–2025) — full calendar-year totals. The long-run average is 11.94" a year.

The seasonal rhythm — each month's normal precipitation, with this year's totals in blue. Where the blue bar clears the band, the month ran wetter than usual.

Normally wettest in Jun (~1.93") and driest in Feb (~0.4"). Wettest calendar month ever: May 1927, 6.67".

Every year's rainfall on each of the next 7 dates at Helena — toggle a day below. The tallest bar (ringed) is the wettest on record for that date.

Helena's cumulative rainfall so far this year against its own record — the normal accumulation, and the wettest & driest years to date. The bright line is the running total; where it rides the band tells the story at a glance.

Helena's entire daily record as one heatmap — each row a year, each cell a day, shaded by that day's rainfall. Dry spells read as dark blocks, wet seasons as brighter bands; the whole climate at a glance.

Every week of the U.S. Drought Monitor for Helena's county since 2000, coloured by intensity — dry spells and multi-year droughts read as warm bands.