Rankings · Weather

Lowest heat-wave days by state

Days in 3+ day 90°F heat waves.

This measure has no better end. The order describes the states, it does not rank them — see the other direction.

Days in the latest complete year that fell within a run of at least three consecutive county-average daily highs of 90°F or more. A five-day run counts as five days. This is a transparent hot-spell frequency measure, not a heat-health risk score, forecast, record-temperature count, overnight-heat, humidity, shade, air-conditioning, power reliability, or a measure of conditions at a particular address. County values use NOAA’s daily grid; the small set outside that grid use local NOAA climate-station observations. State figures are population-weighted county values.

  1. 1Alaska0 days
  2. 2Minnesota0 days
  3. 3Vermont0 days
  4. 4Wisconsin2 days
  5. 5Montana2 days
  6. 6Maine3 days
  7. 7North Dakota4 days
  8. 8Rhode Island4 days
  9. 9Hawaii4 days
  10. 10New York5 days
  11. 11Wyoming5 days
  12. 12Michigan5 days
  13. 13Washington6 days
  14. 14Pennsylvania6 days
  15. 15Iowa6 days
  16. 16Oregon7 days
  17. 17New Jersey7 days
  18. 18New Hampshire7 days
  19. 19South Dakota8 days
  20. 20Connecticut8 days
  21. 21Massachusetts9 days
  22. 22Illinois10 days
  23. 23Delaware10 days
  24. 24Ohio11 days
  25. 25Nebraska12 days
  26. 26West Virginia12 days
  27. 27Indiana12 days
  28. 28Maryland13 days
  29. 29Virginia16 days
  30. 30Utah18 days
  31. 31Colorado20 days
  32. 32Idaho27 days
  33. 33North Carolina27 days
  34. 34Kentucky29 days
  35. 35Missouri34 days
  36. 36Kansas37 days
  37. 37Tennessee39 days
  38. 38South Carolina40 days
  39. 39California41 days
  40. 40New Mexico45 days
  41. 41Georgia47 days
  42. 42Alabama49 days
  43. 43Oklahoma54 days
  44. 44Arkansas58 days
  45. 45Mississippi77 days
  46. 46Nevada85 days
  47. 47Louisiana87 days
  48. 48Florida103 days
  49. 49Texas114 days
  50. 50Arizona141 days

Not ranked, because this measure is not published for them: District of Columbia. Four county-equivalents had no qualifying NOAA daily record in 2025 and are left unavailable rather than estimated.

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Source: NOAA NCEI nClimGrid-Daily; NOAA RCC-ACIS. · How this is built