Natrona Lock 4 Threshold Days by Year
15 fixed thresholds counted per year at Natrona Lock 4 (USC00366151): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Natrona Lock 4 Thresholds
- Natrona Lock 4: days with 10 mm (0.39 in) or more of precipitation in 98 years, most in 2018 with 53.
- Natrona Lock 4: days with 25 mm (0.98 in) or more of precipitation in 98 years, most in 2018 with 15.
- Natrona Lock 4: days with 50 mm (1.97 in) or more of precipitation in 45 years, most in 2004 with 4.
- Natrona Lock 4: days with 10 cm (3.9 in) or more of snowfall in 40 years, most in 1960 with 6.
- 15 fixed thresholds have at least one qualifying day at Natrona Lock 4.
Days at or above 30 C (86 F)
15 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 2011 | 34 | 33.5 |
| 2013 | 29 | 33.5 |
| 2014 | 18 | 33.5 |
| 2015 | 32 | 33.5 |
| 2016 | 57 | 33.5 |
| 2017 | 28 | 33.5 |
| 2018 | 33 | 33.5 |
| 2019 | 37 | 33.5 |
| 2020 | 51 | 39 |
| 2021 | 49 | 39 |
| 2022 | 32 | 39 |
| 2023 | 37 | 39 |
| 2024 | 50 | 39 |
| 2025 | 34 | 39 |
| 2026 | 20 | 39 |
| Year | First date | Last date |
|---|---|---|
| 2011 | 2011-05-30 | 2011-09-04 |
| 2013 | 2013-05-22 | 2013-10-07 |
| 2014 | 2014-05-14 | 2014-09-06 |
| 2015 | 2015-05-09 | 2015-09-20 |
| 2016 | 2016-05-26 | 2016-09-24 |
| 2017 | 2017-05-18 | 2017-09-28 |
| 2018 | 2018-05-26 | 2018-10-10 |
| 2019 | 2019-05-20 | 2019-10-03 |
| 2020 | 2020-05-26 | 2020-09-10 |
| 2021 | 2021-05-21 | 2021-09-19 |
| 2022 | 2022-05-22 | 2022-08-30 |
| 2023 | 2023-04-06 | 2023-09-07 |
| 2024 | 2024-05-04 | 2024-09-15 |
| 2025 | 2025-06-05 | 2025-09-23 |
| 2026 | 2026-05-19 | 2026-09-04 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 15 | 57 | 2016 | 20 |
| 35 C (95 F): Days | 11 | 6 | 2020 | 3 |
| 90 F (32.2 C): Days | 15 | 28 | 2024 | 10 |
| 0 C (32 F): Ice days (max | 15 | 36 | 2014 | 26 |
| 0 C (32 F): Frost days (min | 15 | 133 | 2014 | 61 |
| -10 C (14 F): Days with min | 15 | 36 | 2014 | 24 |
| -20 C (-4 F): Days with min | 6 | 7 | 2015 | 10 |
| 20 C (68 F): Tropical nights (min | 15 | 32 | 2021 | 20 |
| 25 C (77 F): Days with min | 1 | 1 | 2019 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 98 | 53 | 2018 | 40 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 98 | 15 | 2018 | 16 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 45 | 4 | 2004 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 5 | 1 | 1954 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 40 | 6 | 1960 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 11 | 1 | 1950 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2011.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-14).