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Due to some unexpected system maintenance, some of our online systems are unavailable. We apologize for the inconvenience.
| Month | Niño 1+2 | Niño 3 | Niño 4 | Niño 3.4 | ||||
|---|---|---|---|---|---|---|---|---|
| Temp | Anom | Temp | Anom | Temp | Anom | Temp | Anom | |
| June 2009 | 23.73°C | 0.70°C | 27.12°C | 0.74°C | 29.20°C | 0.57°C | 28.11°C | 0.62°C |
| 74.71°F | 1.26°F | 80.82°F | 1.33°F | 84.56°F | 1.03°F | 82.60°F | 1.12°F | |
| July 2009 | 22.63°C | 0.81°C | 26.56°C | 0.99°C | 29.21°C | 0.63°C | 27.94°C | 0.86°C |
| 72.73°F | 1.46°F | 79.81°F | 1.78°F | 84.58°F | 1.13°F | 82.29°F | 1.55°F | |
| August 2009 | 21.64°C | 0.84°C | 25.94°C | 0.98°C | 29.21°C | 0.76°C | 27.53°C | 0.82°C |
| 70.95°F | 1.51°F | 78.69°F | 1.76°F | 84.58°F | 1.37°F | 81.55°F | 1.48°F | |
| September 2009 | 20.82°C | 0.33°C | 25.66°C | 0.82°C | 29.28°C | 0.79°C | 27.47°C | 0.83°C |
| 69.48°F | 0.59°F | 78.19°F | 1.48°F | 84.70°F | 1.42°F | 81.45°F | 1.49°F | |
| October 2009 | 20.88°C | -0.03°C | 25.68°C | 0.78°C | 29.62°C | 1.21°C | 27.58°C | 0.99°C |
| 69.58°F | -0.05°F | 78.22°F | 1.40°F | 85.32°F | 2.18°F | 81.64°F | 1.78°F | |
| Oct - Sep Difference |
0.06°C | -0.36°C | 0.02°C | -0.04°C | 0.34°C | 0.42°C | 0.11°C | 0.16°C |
| 0.11°F | -0.65°F | 0.04°F | -0.07°F | 0.61°F | 0.76°F | 0.20°F | 0.29°F | |
Warm and cold phases are defined as a minimum of five consecutive 3-month running mean of SST anomalies (ERSST.v3, 1971-2000 base period) in the Niño 3.4 region surpassing a threshold of +/- 0.5°C.
| AMJ | MJJ | JJA | JAS | ASO |
|---|---|---|---|---|
| 0.2°C 0.4°F | 0.6°C 1.1°F | 0.7°C 1.3°F | 0.8°C 1.4°F | 0.9°C 1.6°F |
Outgoing Longwave Radiation (OLR) as observed at the top of the atmosphere by the AVHRR instrument aboard the NOAA polar orbiting spacecraft centered across equatorial areas from 160° east to 160° west longitude and converted into a standardized anomaly index. Negative (Positive) OLR are indicative of enhanced (suppressed) convection and hence more (less) cloud coverage typical of El Niño (La Niña) episodes. More information on can be found at the Climate Prediction Center OLR page.
| Jun 2009 | Jul 2009 | Aug 2009 | Sep 2009 | Oct 2009 |
|---|---|---|---|---|
The Southern Oscillation Index is a standardized index based on the observed sea level pressure differences between Darwin and Tahiti. More information can be found at the Climate Prediction Center SOI page. Prolonged periods of negative (positive) SOI values coincide with abnormally warm (cold) ocean waters across the eastern tropical Pacific typical of El Niño (La Niña) episodes.
| Jun 2009 | Jul 2009 | Aug 2009 | Sep 2009 | Oct 2009 |
|---|---|---|---|---|
Please note: On 1 August 2008, the CPC changed their calculations of Niño region SST anomalies to a base period of 1971-2000 from the previous base period of 1961-1990. As a result, all historical anomalies were recalculated. SST anomalies and their comparisons to previous months presented as of 7 August, and in monthly summaries beginning with the July summary are based upon this new calculation.
For all climate questions, please contact the National Climatic Data Center's Climate Services and Monitoring Division:
Climate Services and Monitoring Division
http://lwf.ncdc.noaa.gov/oa/climate/research/enso/index.php