September 2026: Weather Records and Temperatures Against Normal
September 2026 is provisional: these figures use the data received up to 12 November 2026. Station reports from outside the United States arrive days to weeks late, so the numbers for September 2026 can change until the month is settled on 14 November 2026, 45 days after it ended. This page compares September 2026 at weather stations worldwide with each station's own 1991 to 2020 September normal, ranks it against September of every year since 1951, and lists the weather records, events and storms of the month.
Data as of . Last revised (2026-11-12).
Key Facts
- September 2026 is provisional until 14 November 2026; its data run to 12 November 2026.
- Too few stations have reported for September 2026 to compute a world value: the cells with data hold 50% of the area weight, under the 50% the page needs.
- Among the continents in September 2026, North America was the warmest against normal, at +1.3 C (+2.4 F), and Oceania the coolest, at +1.2 C (+2.1 F).
- The station furthest above its September normal in September 2026 was Licking 4N (United States), at +7.1 C (+12.9 F); the furthest below was Evans Creek Oregon (United States), at -3.7 C (-6.7 F).
- Of the 3,277 stations with a full month of rain data in September 2026, 30% had less than half their normal September rain and 15% had at least twice their normal; the median station had 86% of its normal.
- 26,840 weather records were set or tied in September 2026, including 19,599 record highs and 2,369 record lows of maximum and minimum temperature, and 125 all-time records. 13,354 of them are still provisional and can change.
- In September 2026, 88% of the daily temperature records were record highs (7.6 to 1 highs to lows), against an average of 81% for September in 2016 to 2025.
- 78 extreme weather events detected by this site overlapped September 2026.
- 17 named storms had a best track position in September 2026; 10 peaked at 64 kt (119 km/h, 74 mph) or more and 8 at 96 kt (178 km/h, 110 mph) or more over their lifetime.
- The Oceanic Nino Index for ASO 2026, the three months centred on September 2026, was +2.46: El Nino conditions, part of an El Nino episode. NOAA's relative index (RONI) for the same season was +1.97.
- Monthly mean extent in September 2026: Arctic sea ice 4.81 million sq km (1.86 million sq mi), the 13th lowest of 48 years for September; Antarctic sea ice 17.32 million sq km (6.69 million sq mi), the 3rd lowest of 48 years for September.
- Carbon dioxide at Mauna Loa averaged 426.07 ppm in September 2026, 1.70 ppm more than in September 2025.
Temperature Against Normal
September 2026, against 1991 to 2020| Band | Stations on the map |
|---|---|
| More than 3 C (5.4 F) below normal | 0 |
| 1 to 3 C (1.8 to 5.4 F) below normal | 62 |
| Within 1 C (1.8 F) of normal | 515 |
| 1 to 3 C (1.8 to 5.4 F) above normal | 586 |
| More than 3 C (5.4 F) above normal | 241 |
| Area | Stations | Daily maximum vs normal | Daily minimum vs normal | Mean vs normal | Rank for September (1 is warmest) |
|---|---|---|---|---|---|
| World | 3,952 | n/a | n/a | n/a | n/a |
| Africa | 15 | n/a | n/a | n/a | n/a |
| Asia | 96 | n/a | n/a | n/a | n/a |
| Europe | 144 | n/a | n/a | n/a | n/a |
| North America | 3,312 | +0.9 C (+1.7 F) | +1.7 C (+3.1 F) | +1.3 C (+2.4 F) | 1st of 76 |
| Oceania | 385 | +1.0 C (+1.9 F) | +1.3 C (+2.4 F) | +1.2 C (+2.1 F) | 2nd of 76 |
| South America | 0 | n/a | n/a | n/a | n/a |
Stations are averaged in 5 degree grid cells and the cells are weighted by the cosine of their latitude. A value and a rank need cells holding at least 50% of the weight of every cell that has ever had data for September; n/a means fewer stations have reported so far. The world includes Antarctica and islands without a continent row.
| Year | Mean against the 1991 to 2020 normal |
|---|---|
| 1951 | -0.2 C (-0.3 F) |
| 1952 | -0.4 C (-0.8 F) |
| 1953 | -0.4 C (-0.7 F) |
| 1954 | -0.3 C (-0.6 F) |
| 1955 | -0.4 C (-0.8 F) |
| 1956 | -1.1 C (-2.0 F) |
| 1957 | -0.7 C (-1.2 F) |
| 1958 | -1.0 C (-1.7 F) |
| 1959 | -0.4 C (-0.8 F) |
| 1960 | -0.7 C (-1.2 F) |
| 1961 | -0.5 C (-0.9 F) |
| 1962 | -0.8 C (-1.4 F) |
| 1963 | -0.4 C (-0.7 F) |
| 1964 | -0.9 C (-1.6 F) |
| 1965 | -0.8 C (-1.4 F) |
| 1966 | -0.7 C (-1.3 F) |
| 1967 | -1.0 C (-1.8 F) |
| 1968 | -1.1 C (-2.0 F) |
| 1969 | -1.0 C (-1.8 F) |
| 1970 | -0.7 C (-1.2 F) |
| 1971 | -0.6 C (-1.0 F) |
| 1972 | -1.1 C (-2.0 F) |
| 1973 | -0.8 C (-1.5 F) |
| 1974 | -0.7 C (-1.3 F) |
| 1975 | -0.4 C (-0.7 F) |
| 1976 | -1.0 C (-1.8 F) |
| 1977 | -0.7 C (-1.3 F) |
| 1978 | -0.8 C (-1.5 F) |
| 1979 | -0.5 C (-1.0 F) |
| 1980 | -0.4 C (-0.7 F) |
| 1981 | -0.5 C (-0.9 F) |
| 1982 | -0.5 C (-1.0 F) |
| 1983 | -0.1 C (-0.3 F) |
| 1984 | -0.9 C (-1.6 F) |
| 1985 | -0.8 C (-1.5 F) |
| 1986 | -0.7 C (-1.3 F) |
| 1987 | -0.4 C (-0.8 F) |
| 1988 | -0.2 C (-0.4 F) |
| 1989 | -0.5 C (-0.8 F) |
| 1990 | -0.4 C (-0.8 F) |
| 1991 | -0.3 C (-0.5 F) |
| 1992 | -0.9 C (-1.7 F) |
| 1993 | -0.9 C (-1.6 F) |
| 1994 | -0.3 C (-0.6 F) |
| 1995 | -0.2 C (-0.3 F) |
| 1996 | -0.8 C (-1.5 F) |
| 1997 | -0.2 C (-0.4 F) |
| 1998 | +0.1 C (+0.2 F) |
| 1999 | -0.1 C (-0.2 F) |
| 2000 | -0.2 C (-0.4 F) |
| 2001 | -0.2 C (-0.4 F) |
| 2002 | 0.0 C (0.0 F) |
| 2003 | +0.0 C (+0.0 F) |
| 2004 | -0.1 C (-0.2 F) |
| 2005 | +0.5 C (+0.9 F) |
| 2006 | +0.2 C (+0.3 F) |
| 2007 | +0.2 C (+0.4 F) |
| 2008 | -0.1 C (-0.2 F) |
| 2009 | +0.3 C (+0.5 F) |
| 2010 | +0.2 C (+0.3 F) |
| 2011 | +0.1 C (+0.2 F) |
| 2012 | +0.2 C (+0.3 F) |
| 2013 | +0.1 C (+0.2 F) |
| 2014 | +0.2 C (+0.4 F) |
| 2015 | +0.5 C (+0.9 F) |
| 2016 | +0.7 C (+1.2 F) |
| 2017 | +0.4 C (+0.6 F) |
| 2018 | +0.6 C (+1.0 F) |
| 2019 | +0.5 C (+0.9 F) |
| 2020 | +0.6 C (+1.0 F) |
| 2021 | +0.3 C (+0.6 F) |
| 2022 | +0.5 C (+0.8 F) |
| 2023 | +1.2 C (+2.1 F) |
| 2024 | +1.0 C (+1.8 F) |
| 2025 | +0.7 C (+1.2 F) |
| 2026 | n/a |
Furthest Above Normal
| Station | Country | Mean maximum | Maximum vs normal | Mean minimum | Minimum vs normal | Mean vs normal | Years of normal |
|---|---|---|---|---|---|---|---|
| Licking 4N | United States | 35.3 C (95.5 F) | +8.7 C (+15.7 F) | 19.0 C (66.2 F) | +5.6 C (+10.0 F) | +7.1 C (+12.9 F) | 30 |
| Wichita Colonel James Jabara A | United States | 35.2 C (95.4 F) | +6.9 C (+12.5 F) | 22.2 C (71.9 F) | +6.9 C (+12.5 F) | +6.9 C (+12.5 F) | 25 |
| Marshfield 4 WSW | United States | 34.6 C (94.2 F) | +8.0 C (+14.5 F) | 20.3 C (68.5 F) | +5.4 C (+9.7 F) | +6.7 C (+12.1 F) | 30 |
| Guthrie | United States | 37.5 C (99.5 F) | +6.3 C (+11.3 F) | 23.0 C (73.4 F) | +7.2 C (+12.9 F) | +6.7 C (+12.1 F) | 30 |
| Lake Kemp | United States | 38.6 C (101.5 F) | +7.1 C (+12.7 F) | 24.3 C (75.8 F) | +6.3 C (+11.3 F) | +6.7 C (+12.0 F) | 29 |
| McAlester Rgnl AP | United States | 37.3 C (99.1 F) | +7.4 C (+13.2 F) | 22.7 C (72.8 F) | +5.5 C (+9.9 F) | +6.4 C (+11.6 F) | 30 |
| Fayetteville Drake Fld | United States | 34.6 C (94.3 F) | +7.1 C (+12.7 F) | 19.8 C (67.6 F) | +5.8 C (+10.4 F) | +6.4 C (+11.5 F) | 30 |
| Stockton Dam | United States | 33.2 C (91.8 F) | +6.0 C (+10.7 F) | 21.9 C (71.5 F) | +6.8 C (+12.2 F) | +6.4 C (+11.5 F) | 30 |
| Cope Rch | United States | 37.9 C (100.2 F) | +7.0 C (+12.7 F) | 21.1 C (70.0 F) | +5.7 C (+10.2 F) | +6.4 C (+11.4 F) | 30 |
| Muskogee Davis Fld | United States | 36.6 C (98.0 F) | +7.0 C (+12.7 F) | 22.2 C (72.0 F) | +5.5 C (+9.9 F) | +6.3 C (+11.3 F) | 25 |
Furthest Below Normal
| Station | Country | Mean maximum | Maximum vs normal | Mean minimum | Minimum vs normal | Mean vs normal | Years of normal |
|---|---|---|---|---|---|---|---|
| Evans Creek Oregon | United States | 21.5 C (70.6 F) | -5.7 C (-10.3 F) | 10.3 C (50.6 F) | -1.7 C (-3.0 F) | -3.7 C (-6.7 F) | 29 |
| Markley Cove | United States | 30.5 C (86.9 F) | -1.8 C (-3.3 F) | 7.4 C (45.4 F) | -4.7 C (-8.5 F) | -3.3 C (-5.9 F) | 29 |
| Bald Knob Lookout Oregon | United States | 17.2 C (63.0 F) | -4.8 C (-8.6 F) | 9.0 C (48.2 F) | -1.6 C (-2.9 F) | -3.2 C (-5.7 F) | 30 |
| Sugarloaf Oregon | United States | 17.4 C (63.3 F) | -4.2 C (-7.6 F) | 7.5 C (45.4 F) | -2.1 C (-3.7 F) | -3.1 C (-5.7 F) | 28 |
| Sevenmile Marsh | United States | 16.2 C (61.2 F) | -3.9 C (-7.1 F) | 5.2 C (41.4 F) | -1.9 C (-3.5 F) | -2.9 C (-5.3 F) | 30 |
| Sims California | United States | 27.6 C (81.6 F) | -4.6 C (-8.3 F) | 11.9 C (53.4 F) | -1.2 C (-2.2 F) | -2.9 C (-5.3 F) | 28 |
| Stonyford California | United States | 30.3 C (86.5 F) | -2.2 C (-4.0 F) | 8.4 C (47.1 F) | -3.6 C (-6.5 F) | -2.9 C (-5.2 F) | 27 |
| Silver Butte Oregon | United States | 18.3 C (64.9 F) | -3.8 C (-6.9 F) | 8.3 C (46.9 F) | -2.0 C (-3.5 F) | -2.9 C (-5.2 F) | 30 |
| Fish Lk. | United States | 17.8 C (64.0 F) | -4.4 C (-8.0 F) | 4.8 C (40.6 F) | -1.2 C (-2.2 F) | -2.8 C (-5.1 F) | 30 |
| Jerome | United States | 24.2 C (75.6 F) | -3.7 C (-6.6 F) | 15.2 C (59.4 F) | -1.8 C (-3.3 F) | -2.7 C (-4.9 F) | 28 |
The lists use stations with at least 25 years behind their normal. One station does not stand for the area around it.
Countries
| Country | Stations | Mean vs normal |
|---|---|---|
| Switzerland | 5 | +3.1 C (+5.6 F) |
| Kazakhstan | 25 | +2.8 C (+5.0 F) |
| Spain | 21 | +2.5 C (+4.6 F) |
| France | 5 | +2.4 C (+4.3 F) |
| Mongolia | 5 | +2.2 C (+3.9 F) |
| Kyrgyzstan | 5 | +2.1 C (+3.7 F) |
| Mexico | 7 | +1.7 C (+3.1 F) |
| Uzbekistan | 9 | +1.4 C (+2.5 F) |
| Russia | 21 | +1.4 C (+2.5 F) |
| United States | 3,296 | +1.3 C (+2.3 F) |
| Australia | 379 | +1.3 C (+2.3 F) |
| India | 14 | +1.2 C (+2.2 F) |
| Puerto Rico [United States] | 7 | +1.1 C (+2.0 F) |
| Belarus | 8 | +1.1 C (+1.9 F) |
| Turkmenistan | 10 | +1.0 C (+1.9 F) |
| Finland | 13 | +0.8 C (+1.4 F) |
| Ukraine | 18 | +0.7 C (+1.3 F) |
| Turkey | 6 | +0.6 C (+1.1 F) |
| Norway | 9 | +0.5 C (+0.8 F) |
| South Africa | 7 | +0.4 C (+0.8 F) |
| Thailand | 11 | +0.2 C (+0.3 F) |
Rain Against Normal
3,277 stations, September 2026| Band | Stations on the map |
|---|---|
| Under 50% of normal | 347 |
| 50 to 90% of normal | 223 |
| 90 to 110% of normal | 86 |
| 110 to 200% of normal | 229 |
| 200% or more of normal | 181 |
| Under 50% | |
|---|---|
| 50 to 90% | |
| 90 to 110% | |
| 110 to 200% | |
| 200% or more |
Of the 3,277 stations with a full month of rain data in September 2026, 30% had less than half their normal September rain and 15% had at least twice their normal; the median station had 86% of its normal. A station month needs 28 days of rain data, because a total from fewer days is too low, and a normal of at least 10 mm.
Wettest Against Normal
| Station | Country | Rain | Normal | Percent of normal | Years of normal |
|---|---|---|---|---|---|
| Nemuro | Japan | 1,286.8 mm (50.7 in) | 165.1 mm (6.5 in) | 780% | 25 |
| La Junta Muni AP | United States | 155.2 mm (6.1 in) | 20.7 mm (0.8 in) | 749% | 28 |
| Lisboa Geofisica | Portugal | 231.6 mm (9.1 in) | 36.4 mm (1.4 in) | 635% | 29 |
| Kalgoorlie-Boulder Airport | Australia | 80.2 mm (3.2 in) | 12.9 mm (0.5 in) | 622% | 25 |
| Ordway 4 W | United States | 101.4 mm (4.0 in) | 17.3 mm (0.7 in) | 586% | 29 |
| Tribune 1W | United States | 166.1 mm (6.5 in) | 28.8 mm (1.1 in) | 576% | 30 |
| Ruhnu | Latvia | 313.0 mm (12.3 in) | 55.3 mm (2.2 in) | 566% | 30 |
| Bulong | Australia | 79.6 mm (3.1 in) | 15.1 mm (0.6 in) | 526% | 30 |
| Dalhart FAA AP | United States | 171.8 mm (6.8 in) | 32.7 mm (1.3 in) | 525% | 30 |
| Bagdad | United States | 169.2 mm (6.7 in) | 32.7 mm (1.3 in) | 517% | 29 |
Driest Against Normal
| Station | Country | Rain | Normal | Percent of normal | Years of normal |
|---|---|---|---|---|---|
| Lexington | United States | 0.0 mm (0.00 in) | 101.8 mm (4.0 in) | 0% | 26 |
| Nashville Intl AP | United States | 0.0 mm (0.00 in) | 96.4 mm (3.8 in) | 0% | 30 |
| Aberdeen | United States | 0.0 mm (0.00 in) | 94.0 mm (3.7 in) | 0% | 26 |
| Fordyce | United States | 0.0 mm (0.00 in) | 91.5 mm (3.6 in) | 0% | 30 |
| Old Hickory Dam | United States | 0.0 mm (0.00 in) | 88.4 mm (3.5 in) | 0% | 29 |
| Beedeville 4 NE | United States | 0.0 mm (0.00 in) | 78.8 mm (3.1 in) | 0% | 29 |
| Pine Bluff Grider Fld | United States | 0.0 mm (0.00 in) | 78.5 mm (3.1 in) | 0% | 30 |
| Sabinal | United States | 0.0 mm (0.00 in) | 76.9 mm (3.0 in) | 0% | 29 |
| Merriwa (Roscommon) | Australia | 0.0 mm (0.00 in) | 40.4 mm (1.6 in) | 0% | 29 |
| Corral Canyon | United States | 0.0 mm (0.00 in) | 36.4 mm (1.4 in) | 0% | 30 |
Weather Records
26,840 set or tied in September 202626,840 weather records were set or tied in September 2026, including 19,599 record highs and 2,369 record lows of maximum and minimum temperature, and 125 all-time records. 13,354 of them are still provisional and can change. Every record of the month is in the records ledger for September 2026.
| Record high minimum temperature | |
|---|---|
| Record high maximum temperature | |
| Record daily precipitation | |
| Record low maximum temperature | |
| Record low minimum temperature | |
| Record snow depth | |
| Record daily snowfall |
| Daily | |
|---|---|
| Monthly | |
| All-time |
September Against the Ten Years Before
| Year | Record highs, percent of highs and lows |
|---|---|
| 2016 | 87.1% |
| 2017 | 70.3% |
| 2018 | 77.4% |
| 2019 | 77.5% |
| 2020 | 62.8% |
| 2021 | 83.3% |
| 2022 | 86.8% |
| 2023 | 92.6% |
| 2024 | 87.8% |
| 2025 | 82.3% |
| 2026 | 88.3% |
In September 2026, 88% of the daily temperature records were record highs (7.6 to 1 highs to lows), against an average of 81% for September in 2016 to 2025.
The Top 10 Records of September 2026
| Date | Station | Country | Record | Value | Significance |
|---|---|---|---|---|---|
| 2026-09-27 | Wattening | Australia | Monthly precipitation | 55.4 mm (2.2 in) | 90 of 100 (Exceptional) |
| 2026-09-04 | Otaru | Japan | All-time precipitation | 255.5 mm (10.1 in) | 86 of 100 (Exceptional) |
| 2026-09-07 | Toyama | Japan | All-time precipitation | 377.0 mm (14.8 in) | 85 of 100 (Exceptional) |
| 2026-09-08 | Koloa Mauka 994 | United States | Monthly precipitation | 190.5 mm (7.5 in) | 83 of 100 (Exceptional) |
| 2026-09-15 | Takayama | Japan | All-time precipitation | 361.5 mm (14.2 in) | 83 of 100 (Exceptional) |
| 2026-09-29 | Courtenay 1 NW | United States | All-time precipitation | 171.5 mm (6.8 in) | 83 of 100 (Exceptional) |
| 2026-09-03 | Kobe | Japan | All-time precipitation | 410.0 mm (16.1 in) | 82 of 100 (Exceptional) |
| 2026-09-09 | Guadalajara | Mexico | All-time precipitation | 208.3 mm (8.2 in) | 81 of 100 (Exceptional) |
| 2026-09-30 | Eagle Nest | United States | Monthly precipitation | 55.1 mm (2.2 in) | 81 of 100 (Exceptional) |
| 2026-09-01 | Zoseni | Latvia | Monthly precipitation | 98.2 mm (3.9 in) | 80 of 100 (Exceptional) |
Countries With the Most Records
| Country | Records | Highs | Lows |
|---|---|---|---|
| United States | 18,392 | 13,666 | 1,787 |
| Australia | 1,550 | 1,089 | 143 |
| Germany | 1,218 | 1,147 | 15 |
| Japan | 1,055 | 263 | 47 |
| Spain | 586 | 563 | 5 |
| Mexico | 509 | 315 | 91 |
| India | 374 | 346 | 28 |
| Sweden | 291 | 147 | 28 |
| France | 278 | 274 | 0 |
| Mongolia | 257 | 237 | 18 |
| China | 230 | 115 | 43 |
| United Kingdom | 195 | 175 | 2 |
| Kazakhstan | 185 | 172 | 11 |
| Finland | 150 | 34 | 22 |
| Netherlands | 133 | 128 | 1 |
Events and Storms
17 named storms had a best track position in September 2026; 10 peaked at 64 kt (119 km/h, 74 mph) or more and 8 at 96 kt (178 km/h, 110 mph) or more over their lifetime.
| Storm | Basin | Lifetime peak wind | Category at peak |
|---|---|---|---|
| Choi-Wan | Western North Pacific | 134 kt (248 km/h, 154 mph) | Category 4 |
| Hanna | North Atlantic | 40 kt (74 km/h, 46 mph) | Tropical storm |
| Rachel | Eastern North Pacific | 105 kt (194 km/h, 121 mph) | Category 3 |
| Surigae | Western North Pacific | 128 kt (237 km/h, 147 mph) | Category 4 |
| Gonzalo | North Atlantic | 45 kt (83 km/h, 52 mph) | Tropical storm |
| Fay | North Atlantic | 60 kt (111 km/h, 69 mph) | Tropical storm |
| Polo | Eastern North Pacific | 155 kt (287 km/h, 178 mph) | Category 5 |
| Odalys | Eastern North Pacific | 115 kt (213 km/h, 132 mph) | Category 4 |
| Dujuan | Western North Pacific | 70 kt (130 km/h, 81 mph) | Category 1 |
| Nolo | Eastern North Pacific | 135 kt (250 km/h, 155 mph) | Category 4 |
| Norbert | Eastern North Pacific | 55 kt (102 km/h, 63 mph) | Tropical storm |
| Krovanh | Western North Pacific | 45 kt (83 km/h, 52 mph) | Tropical storm |
| Saudel | Western North Pacific | 39 kt (72 km/h, 45 mph) | Tropical storm |
| Marie | Eastern North Pacific | 85 kt (157 km/h, 98 mph) | Category 2 |
| Edouard | North Atlantic | 50 kt (93 km/h, 58 mph) | Tropical storm |
| Lowell | Eastern North Pacific | 140 kt (259 km/h, 161 mph) | Category 5 |
| Karina | Eastern North Pacific | 125 kt (232 km/h, 144 mph) | Category 4 |
September 2026 in Context
These values come from other sources and the site's own analysis pages. They are context for September 2026; this page does not say that any of them caused the temperatures or records above.
How These Numbers Are Made
Each station's mean daily maximum and minimum temperature for September 2026 is compared with its own mean for September in 1991 to 2020, from months with at least 20 days of both. A station needs 20 such years for a normal. The mean is the average of the two differences. A station month more than 15 C (27 F) from its normal in either element is treated as a data error and left out.
For the world and each continent, stations are averaged within 5 degree grid cells and the cells are averaged weighted by the cosine of their latitude, so dense networks do not outweigh sparse ones. A continent uses the stations of its own countries. A year gets a value and a rank only when its cells hold at least 50% of the weight of all the cells that have ever had data for September, the rule of the climate pages. This is a station based view: places without stations are not covered, and it is not a gridded temperature analysis.
Records are the site's public ledger: one record per observation, set or tied, at its broadest timescale. The ten year comparison uses daily temperature records only, ties excluded. The numbers and sentences on this page are generated by code from the station data; none of them is typed in by hand.
Download the Data
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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)) Source: International Best Track Archive for Climate Stewardship (IBTrACS) v04r01, NOAA National Centers for Environmental Information, doi:10.25921/82ty-9e16. Some agency values come from third parties such as JMA, IMD and BoM. (NOAA NCEI terms (citation requested)) Source: NOAA Climate Prediction Center, Oceanic Nino Index (ONI) and Relative Oceanic Nino Index (RONI). Episodes and strength classes are computed by World Extreme Weather Monitor and are not NOAA products. (US Government work, public domain (NWS disclaimer)) Source: Fetterer, F., Knowles, K., Meier, W. N., Savoie, M., Windnagel, A. K. and Stafford, T. (2025). Sea Ice Index, Version 4 (G02135). Boulder, Colorado USA. National Snow and Ice Data Center. doi:10.7265/a98x-0f50. Yearly extremes, ranks, trends and the climatology are computed by World Extreme Weather Monitor from the daily extent files and are not NSIDC products. (NSIDC data use and citation policy (public domain government funded data, citation required)) Source: NOAA Global Monitoring Laboratory, Earth System Research Laboratories (gml.noaa.gov/ccgg/trends). Mauna Loa CO2 data are from NOAA and Scripps (before 1974 the monthly values come from the Scripps Institution of Oceanography). The global means of CO2, methane and nitrous oxide are from the NOAA GML cooperative air sampling network (methane and nitrous oxide: Lan, Thoning and Dlugokencky, doi:10.15138/P8XG-AA10). (US Government open data (NOAA GML, citation requested)) Data as of 2026-11-12. Temperatures against normal, ranks and records are computed by this site from station data and are not official.