September 2023 brought heat waves, heavy rainfall, and the first named storm of the season, Storm Agnes. Even though the EU's Copernicus has revealed that globally September was the warmest on record, it did not prove to be that in Mayo. It was the same in Newport as in 2021, but there are no data for 2022. It was considerably higher than the long-term average, which I am sure contributed to a boost in sugar content towards the end of the ripening, allowing us to harvest before the storms hit.
I wrote the following for the OCC website:
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2023 is on track to become a record-breaking year with the global mean temperature to date at 0.52 degrees Celsius higher than average, says the European Union's Copernicus Climate Change Service.
Last month was the warmest September on record globally, reaching 0.93°C above the average temperature for the same month in the period 1991-2020. The month as a whole was around 1.75°C warmer than the September average for 1850-1900, the preindustrial reference period. The global mean temperature in September was the most atypical warm month of any year in the ERA5 dataset, which dates back to 1940.
Copernicus calculated the average temperature for September was 16.38°C which broke the record set in September 2020 by a whopping half-degree Celsius. This is the warmest margin above average for a month in 83 years of records kept by the Copernicus Climate Change Service.
The hot temperatures were chiefly driven by persistent and unusual warmth in the world's oceans, which didn't cool off as much in September as normal and have been breaking records since spring. The average sea surface temperature for September over 60°S–60°N reached 20.92C, which is the highest on record for September and the second highest across all months, behind August 2023.
Antarctic sea ice extent remained at a record low level for the time of year. Both the daily and monthly extents reached their lowest annual maxima in the satellite record in September, with the monthly extent 9% below average. The daily Arctic sea ice extent reached its 6th lowest annual minimum while the monthly sea ice extent ranked 5th lowest, at 18% below average.
According to Samantha Burgess, Deputy Director of the Copernicus Climate Change Service (C3S): "The unprecedented temperatures for the time of year observed in September - following a record summer - have broken records by an extraordinary amount. This extreme month has pushed 2023 into the dubious honour of first place - on track to be the warmest year and around 1.4°C above preindustrial average temperatures. Two months out from COP28 – the sense of urgency for ambitious climate action has never been more critical.”
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Monthly values for NEWPORT up to 05-oct-2023
Total rainfall in millimetres for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 183.2 | 91.6 | 188.4 | 121.1 | 48.5 | 77.9 | 206.8 | 139.8 | 142.4 | 26.1 | 1225.8 | ||
| 2022 | 98.8 | 260.4 | 67.8 | 84.0 | 107.0 | 148.0 | 59.2 | 104.1 | 97.3 | 233.9 | 187.5 | 154.6 | 1602.6 |
| 2021 | 225.6 | 147.6 | 141.1 | 45.6 | 113.5 | 64.1 | 59.7 | 155.6 | 137.0 | 265.7 | 183.3 | 186.6 | 1725.4 |
| 2020 | 139.5 | 342.8 | 178.2 | 25.5 | 54.7 | 164.5 | 187.9 | 137.9 | 153.4 | 228.0 | 206.6 | 232.7 | 2051.7 |
| LTA | 166.7 | 126.5 | 141.2 | 96.8 | 94.7 | 89.7 | 100.9 | 132.5 | 131.5 | 176.0 | 170.4 | 180.2 | 1607.1 |
Mean temperature in degrees Celsius for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 6.6 | 8.0 | 7.6 | 9.9 | 13.3 | 17.4 | 14.9 | 15.8 | 15.2 | 14.4 | 12.1 | ||
| 2022 | 7.2 | 7.1 | 8.0 | 9.9 | 12.6 | 13.8 | 15.9 | 16.2 | n/a | 12.2 | 9.4 | 5.2 | 10.7 |
| 2021 | 5.0 | 6.7 | 7.9 | 9.0 | 10.4 | 13.3 | 17.5 | 16.4 | 15.2 | 11.9 | 9.3 | 7.6 | 10.9 |
| 2020 | 7.2 | 6.0 | 6.6 | 11.0 | 12.8 | 13.8 | 14.4 | 16.0 | 13.8 | 10.5 | 9.1 | 6.1 | 10.6 |
| LTA | 6.1 | 6.1 | 7.3 | 9.0 | 11.5 | 13.8 | 15.4 | 15.4 | 13.5 | 10.8 | 8.3 | 6.5 | 10.3 |
Mean 10cm soil temperature for NEWPORT at 0900 UTC
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 5.2 | 6.8 | 6.6 | 9.1 | 13.7 | 18.6 | 16.3 | 16.3 | 14.7 | n/a | 12.0 | ||
| 2022 | 6.2 | 6.2 | 6.3 | 9.3 | 13.2 | 14.8 | 16.8 | 16.6 | n/a | 11.5 | 8.4 | 4.4 | 10.4 |
| 2021 | 3.6 | 5.0 | 6.8 | 8.2 | 10.9 | 14.3 | 17.9 | 16.3 | 15.2 | 11.3 | 8.6 | 6.6 | 10.4 |
| 2020 | 5.7 | 4.7 | 5.4 | 9.7 | 13.0 | 14.8 | 14.9 | 16.3 | 13.7 | 9.5 | 8.0 | 5.1 | 10.1 |
| LTA | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
Global Solar Radiation in Joules/cm2 for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 6245 | 10639 | 21429 | 37277 | 55732 | 58473 | 41797 | 36857 | 29338 | 3819 | 301606 | ||
| 2022 | 6311 | 10756 | 33399 | 40555 | 51569 | 47246 | 48439 | 51169 | n/a | 15988 | 7869 | 6167 | 319468 |
| 2021 | 6620 | 13347 | 20370 | 45694 | 55690 | 45488 | 49455 | 40490 | 22413 | 16358 | 7235 | 3780 | 326940 |
| 2020 | 6263 | 10808 | 24545 | 46192 | 58476 | 43537 | 40215 | 40555 | 25558 | 18487 | 6319 | 5209 | 326164 |
| LTA | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
Potential Evapotranspiration (mm) for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 14.3 | 20.9 | 33.0 | 56.4 | 83.3 | 100.6 | 70.1 | 64.4 | 50.1 | 5.9 | 499.0 | ||
| 2022 | 13.7 | 23.0 | 47.2 | 60.6 | 77.7 | 76.0 | 80.4 | 82.0 | n/a | 27.2 | 17.2 | 9.2 | 514.2 |
| 2021 | 7.6 | 22.9 | 30.7 | 62.9 | 76.3 | 70.7 | 87.8 | 67.5 | 38.3 | 25.1 | 14.1 | 14.6 | 518.5 |
| 2020 | 17.6 | 21.9 | 35.0 | 70.2 | 91.6 | 72.9 | 66.2 | 66.4 | 42.7 | 28.1 | 13.6 | 10.4 | 536.6 |
| LTA | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
Evaporation (mm) for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 18.8 | 28.2 | 47.6 | 81.6 | 118.2 | 137.1 | 99.5 | 89.1 | 67.8 | 8.4 | 696.3 | ||
| 2022 | 17.9 | 32.4 | 66.5 | 86.8 | 114.5 | 109.2 | 111.1 | 113.2 | n/a | 37.0 | 22.0 | 11.4 | 722.0 |
| 2021 | 10.9 | 32.1 | 45.4 | 89.9 | 111.2 | 102.0 | 117.2 | 93.5 | 52.1 | 34.7 | 18.6 | 19.1 | 726.7 |
| 2020 | 22.4 | 31.9 | 51.8 | 98.9 | 130.8 | 104.8 | 94.3 | 92.7 | 59.1 | 38.8 | 18.1 | 13.6 | 757.2 |
| LTA | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
Degree Days Below 15.5 Degree Celsius for NEWPORT
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 275 | 210 | 246 | 171 | 85 | 18 | 39 | 26 | 53 | N/A | N/A | N/A | N/A |
| 2022 | 256 | 234 | 235 | 171 | 97 | 63 | 30 | 28 | N/A | 103 | 185 | 320 | N/A |
| 2021 | 325 | 247 | 236 | 200 | 167 | 79 | 20 | 23 | 40 | 114 | 187 | 245 | 1883 |
| 2020 | 257 | 276 | 275 | 143 | 111 | 73 | 55 | 31 | 71 | 156 | 193 | 291 | 1935 |
Notes on the Data
Evaporation and PE data are calculated using Penman/Monteith formulae.
The ‘LTA’ (referred to within a table) is average for the climatological long-term-average (LTA) reference period 1981-2010.
Data updated daily at Mid-day.
September Weather Statement from Met Eireann
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