NOAA's National Centers for Environmental Information
Divisional Rankings
Washington, Climate Division 1
December 2015 Palmer Z-Index Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Driest/Wettest Since | Record |
|---|---|---|---|---|---|---|
| December 2015 1-Month | 2.95 | -0.19 | 3.14 | 124th Driest | Driest since: | 1985 |
| 7th Wettest | Wettest since: | 1933 | ||||
| Nov– 2-Month | 1.90 | -0.03 | 1.93 | 123rd Driest | Driest since: | 1976 |
| 8th Wettest | Wettest since: | 1998 | ||||
| Ties: 1973 | ||||||
| Oct– 3-Month | 1.31 | -0.04 | 1.35 | 113th Driest | Driest since: | 2013 |
| 18th Wettest | Wettest since: | 1975 | ||||
| Ties: 1966 | ||||||
| Sep– 4-Month | 0.88 | -0.03 | 0.91 | 114th Driest | Driest since: | 1976 |
| 17th Wettest | Wettest since: | 1933 | ||||
| Aug– 5-Month | 0.70 | -0.05 | 0.75 | 111th Driest | Driest since: | 1929 |
| 20th Wettest | Wettest since: | 1975 | ||||
| Jul– 6-Month | 0.13 | -0.08 | 0.21 | 80th Driest | Driest since: | 1930 |
| 51st Wettest | Wettest since: | 1975 | ||||
| Ties: 1971 | ||||||
| Jun– 7-Month | -0.40 | -0.06 | -0.34 | 49th Driest | Driest since: | 1944 |
| 82nd Wettest | Wettest since: | 1997 | ||||
| May– 8-Month | -0.72 | -0.04 | -0.68 | 25th Driest | Driest since: | 2023 |
| 106th Wettest | Wettest since: | 1997 | ||||
| Apr– 9-Month | -0.81 | -0.04 | -0.77 | 17th Driest | Driest since: | 1935 |
| 114th Wettest | Wettest since: | 1997 | ||||
| Mar– 10-Month | -0.73 | -0.05 | -0.68 | 20th Driest | Driest since: | 1992 |
| 111th Wettest | Wettest since: | 1997 | ||||
| Ties: 1914 | ||||||
| Feb– 11-Month | -0.77 | -0.06 | -0.71 | 22nd Driest | Driest since: | 1992 |
| 109th Wettest | Wettest since: | 1997 | ||||
| Jan– 12-Month | -0.75 | -0.06 | -0.69 | 17th Driest | Driest since: | 2019 |
| 114th Wettest | Wettest since: | 1997 | ||||
| Ties: 1925 | ||||||
| Jul 2014– 18-Month | -0.62 | -0.06 | -0.56 | 15th Driest | Driest since: | 2023 |
| 115th Wettest | Wettest since: | 1997 | ||||
| Jan 2014– 24-Month | -0.28 | -0.05 | -0.23 | 43rd Driest | Driest since: | 1930 |
| 87th Wettest | Wettest since: | 1997 | ||||
| Ties: 1931 | ||||||
| Jan 2013– 36-Month | -0.31 | -0.05 | -0.26 | 39th Driest | Driest since: | 1930 |
| 90th Wettest | Wettest since: | 1997 | ||||
| Jan 2012– 48-Month | -0.07 | -0.05 | -0.02 | 60th Driest | Driest since: | 1925 |
| 68th Wettest | Wettest since: | 1999 | ||||
| Ties: 1991 | ||||||
| Jan 2011– 60-Month | -0.01 | -0.05 | 0.04 | 68th Driest | Driest since: | 1926 |
| 59th Wettest | Wettest since: | 1903 | ||||
| Ties: 1920 | ||||||
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 31, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/rankings
