Counties in Montana with more precipitation over the past year than average

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October 2, 2023
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Counties in Montana with more precipitation over the past year than average

During the past winter, parts of California experienced massive amounts of rain and snow. Though it momentarily eased the frequent drought periods that had been affecting the state, the surge in rainfall flooded roads, knocked out power, and broke levees. Fueled by multiple converging atmospheric rivers, the state's infrastructure was not able to capture all of the excess water, meaning water shortages could again return during future dry spells.

Climate change can both intensify rainfall and also extend droughts. Warmer temperatures increase rates of evaporation, pulling more water from the ocean and causing more precipitation overall. Data indicates single-day precipitation extremes are happening more frequently. Conversely, more evaporation also dries out surface water and soil, leaving less fresh water available. Even as the moist air from oceans and other sources returns to land as rain, sleet, or snow, inconsistent wind patterns and currents mean it isn't distributed evenly. That's why even as some counties experienced their wettest year on record, others experienced their driest.

Nationwide, 43% of counties reported precipitation over the past year greater than their long-term average. A 1,000-year event dumped 25 inches of rainfall over 24 hours in Fort Lauderdale on April 13. Nevada desert regions experienced thunderstorms and heavy rain in June. Severe weather through the mid-Atlantic in August brought tennis ball-sized hail to West Virginia and softball-sized hail and flash flooding in Maryland.

Using data from the National Centers for Environmental Information, Stacker identified counties in Montana that received the most precipitation from September 2022 to August 2023 compared to their average annual precipitation from 1901 to 2000. In the case of a tie, the amount of precipitation over the past year served as a tiebreaker.

Read on to see which counties reported more precipitation over the past year than usual.

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#39. Chouteau County

- Precipitation over the past year: 13.9 inches
- Comparison to 1901-2000 average: 0.1 inches above average (#59 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.2 inches below statewide average
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#38. Valley County

- Precipitation over the past year: 12.7 inches
- Comparison to 1901-2000 average: 0.1 inches above average (#67 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 6.5 inches below statewide average
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#37. Blaine County

- Precipitation over the past year: 13.8 inches
- Comparison to 1901-2000 average: 0.2 inches above average (#62 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.3 inches below statewide average
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#36. Beaverhead County

- Precipitation over the past year: 21.6 inches
- Comparison to 1901-2000 average: 0.3 inches above average (#62 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.4 inches above statewide average
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#35. Hill County

- Precipitation over the past year: 12.4 inches
- Comparison to 1901-2000 average: 0.4 inches above average (#52 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 6.8 inches below statewide average
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#34. Liberty County

- Precipitation over the past year: 12.2 inches
- Comparison to 1901-2000 average: 0.5 inches above average (#53 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 7.0 inches below statewide average
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#33. McCone County

- Precipitation over the past year: 13.4 inches
- Comparison to 1901-2000 average: 0.6 inches above average (#56 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.8 inches below statewide average
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#32. Phillips County

- Precipitation over the past year: 13.2 inches
- Comparison to 1901-2000 average: 0.6 inches above average (#53 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.9 inches below statewide average
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#31. Lewis and Clark County

- Precipitation over the past year: 23.8 inches
- Comparison to 1901-2000 average: 0.9 inches above average (#51 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 4.7 inches above statewide average
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#30. Powder River County

- Precipitation over the past year: 15.6 inches
- Comparison to 1901-2000 average: 1.0 inches above average (#49 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.6 inches below statewide average
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#29. Carter County

- Precipitation over the past year: 15.3 inches
- Comparison to 1901-2000 average: 1.0 inches above average (#52 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.8 inches below statewide average
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#28. Custer County

- Precipitation over the past year: 15.1 inches
- Comparison to 1901-2000 average: 1.5 inches above average (#43 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 4.0 inches below statewide average
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#27. Cascade County

- Precipitation over the past year: 19.0 inches
- Comparison to 1901-2000 average: 1.7 inches above average (#40 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.2 inches below statewide average
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#26. Carbon County

- Precipitation over the past year: 19.4 inches
- Comparison to 1901-2000 average: 1.9 inches above average (#33 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.3 inches above statewide average
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#25. Meagher County

- Precipitation over the past year: 24.1 inches
- Comparison to 1901-2000 average: 2.1 inches above average (#39 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 4.9 inches above statewide average
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#24. Deer Lodge County

- Precipitation over the past year: 24.9 inches
- Comparison to 1901-2000 average: 2.1 inches above average (#41 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.8 inches above statewide average
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#23. Judith Basin County

- Precipitation over the past year: 21.9 inches
- Comparison to 1901-2000 average: 2.1 inches above average (#36 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.8 inches above statewide average
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#22. Petroleum County

- Precipitation over the past year: 15.3 inches
- Comparison to 1901-2000 average: 2.2 inches above average (#28 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.9 inches below statewide average
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#21. Broadwater County

- Precipitation over the past year: 18.3 inches
- Comparison to 1901-2000 average: 2.2 inches above average (#28 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.8 inches below statewide average
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#20. Silver Bow County

- Precipitation over the past year: 21.0 inches
- Comparison to 1901-2000 average: 2.3 inches above average (#32 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 1.8 inches above statewide average
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#19. Gallatin County

- Precipitation over the past year: 26.7 inches
- Comparison to 1901-2000 average: 2.4 inches above average (#33 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 7.6 inches above statewide average
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#18. Dawson County

- Precipitation over the past year: 15.8 inches
- Comparison to 1901-2000 average: 2.6 inches above average (#33 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.3 inches below statewide average
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#17. Park County

- Precipitation over the past year: 29.1 inches
- Comparison to 1901-2000 average: 2.9 inches above average (#28 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 10.0 inches above statewide average
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#16. Jefferson County

- Precipitation over the past year: 21.5 inches
- Comparison to 1901-2000 average: 3.0 inches above average (#27 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.3 inches above statewide average
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#15. Garfield County

- Precipitation over the past year: 15.7 inches
- Comparison to 1901-2000 average: 3.0 inches above average (#28 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.4 inches below statewide average
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#14. Fallon County

- Precipitation over the past year: 17.1 inches
- Comparison to 1901-2000 average: 3.0 inches above average (#25 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.0 inches below statewide average
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#13. Big Horn County

- Precipitation over the past year: 18.7 inches
- Comparison to 1901-2000 average: 3.2 inches above average (#22 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.4 inches below statewide average
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#12. Rosebud County

- Precipitation over the past year: 16.9 inches
- Comparison to 1901-2000 average: 3.3 inches above average (#21 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.2 inches below statewide average
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#11. Fergus County

- Precipitation over the past year: 19.7 inches
- Comparison to 1901-2000 average: 3.4 inches above average (#19 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.5 inches above statewide average
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#10. Prairie County

- Precipitation over the past year: 16.1 inches
- Comparison to 1901-2000 average: 3.4 inches above average (#22 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 3.0 inches below statewide average
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#9. Treasure County

- Precipitation over the past year: 17.1 inches
- Comparison to 1901-2000 average: 3.6 inches above average (#18 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.0 inches below statewide average
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#8. Wibaux County

- Precipitation over the past year: 18.1 inches
- Comparison to 1901-2000 average: 3.8 inches above average (#18 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 1.0 inches below statewide average
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#7. Stillwater County

- Precipitation over the past year: 21.7 inches
- Comparison to 1901-2000 average: 3.8 inches above average (#15 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.6 inches above statewide average
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#6. Madison County

- Precipitation over the past year: 27.0 inches
- Comparison to 1901-2000 average: 4.0 inches above average (#18 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 7.9 inches above statewide average
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#5. Musselshell County

- Precipitation over the past year: 17.5 inches
- Comparison to 1901-2000 average: 4.0 inches above average (#17 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 1.6 inches below statewide average
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#4. Yellowstone County

- Precipitation over the past year: 17.7 inches
- Comparison to 1901-2000 average: 4.2 inches above average (#13 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 1.5 inches below statewide average
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#3. Golden Valley County

- Precipitation over the past year: 19.6 inches
- Comparison to 1901-2000 average: 5.6 inches above average (#6 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 0.5 inches above statewide average
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#2. Wheatland County

- Precipitation over the past year: 21.7 inches
- Comparison to 1901-2000 average: 5.7 inches above average (#4 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 2.5 inches above statewide average
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#1. Sweet Grass County

- Precipitation over the past year: 24.5 inches
- Comparison to 1901-2000 average: 5.8 inches above average (#5 rainiest September-August period since 1895)
- Comparison to state's precipitation over past year: 5.4 inches above statewide average

This story features data reporting and writing by Emma Rubin, and is part of a series utilizing data automation across 44 states.

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