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NOAA: Average US Temperature in September 1 °F Above 20th Century Average

The September 2009 average temperature for the contiguous United States was above the long-term average, according to NOAA’s monthly State of the Climate report. Based on records going back to 1895, the monthly National Climatic Data Center analysis is part of the suite of climate services NOAA provides.

September temperature rankings. Source: NOAA. Click to enlarge.

The average September temperature of 66.4 °F (19.1 °C) was 1.0 °F (0.56 °C) above the 20th Century average. Precipitation across the contiguous United States in September averaged 2.48 inches (63 mm), exactly the 1901-2000 average.

  • Below-normal temperatures across parts of the south and Northeast were offset by record high values in the West and above normal temperatures in the Northwest and northern tier states resulting in a higher average temperature for the contiguous United States.

  • Both California and Nevada experienced their warmest September of the 115-year record. Additionally California, Nevada, Montana and North Dakota posted their third warmest, Idaho its fourth warmest, Utah fifth warmest, Minnesota sixth warmest, and Oregon registered its eighth warmest.

  • On a regional level, the West experienced its warmest September on record. The Northwest and West North Central experienced their sixth and eleventh warmest such periods. Below-normal temperatures were recorded in the South and Northeast.

  • While precipitation equaled the long-term average for the contiguous US, regional amounts varied widely. The South experienced its sixth-wettest September, which was countered by the sixth-driest period around the Great Lakes and upper Midwest region.

  • Arkansas registered its second wettest September, Tennessee its fifth, with Mississippi and Alabama posting their sixth wettest on record. Despite notable and flood-producing rains in northern Georgia, drier conditions near the coast kept the state’s overall average out of the top ten.

  • Maine and Wisconsin each experienced their fourth driest September and both New Hampshire and Michigan had their seventh driest such periods.

  • By the end of September, moderate-to-exceptional drought covered 15% of the contiguous United States, based on the US Drought Monitor. Drought intensified in the Upper Midwest and eastern Carolinas, while remaining entrenched in much of the West. Drought conditions remain severe in south Texas, despite some improvement.

  • During September, 5,535 fires burned approximately 378,523 acres—both were below the 2000-2009 average for the month. The acreage burned by wildfires was roughly half of the 2000-2009 average. For the January-September period, 70,217 fires were reported, which is slightly above the 10-year average, while acreage burned is slightly less than average.



Is this some kind of a plot to discredit AGW?

1.0 °F for 1 month in the US? One GD month?

Was this some project for new hires to take one statistic and make something out of nothing?

Now all someone has to do is find a month that was 2.0 or, lord help us, 3.0°F colder than the average.

Ice age.

Henry Gibson

It is now important for Hillary Clinton to get some research done on how the irrigation of formerly dry land areas with water from underground supplies and even water diverted from rivers has significantly increased global warming by putting too much more of the greenhouse gas H2O into the air.

An additional aspect of the green house gas aspect is the evaporation of the greenhouse gas H2O from man made lakes and ponds and the diversion of the waters from rivers for irrigation and evaporative uses in cities. Man has increased the evaporation of water by increasing the surface area and especially growing additional plants. The plants may reduce the CO2 somewhat but not permanently, but they release many pounds of the greenhouse gas H20 for every gram of CO2 captured.

The ocean is not significantly larger if all river runoff is directly run into it, so evaporation is not increased much, but dams on such rivers and the waters diverted from it, substantially increase the evaporation of water from the river. The dams on the Colorado River clearly divert almost all of the water from the river and thus release many billions of tonnes of greenhouse gasses into the air. Dams can no longer be considered green house gas production free. The effect could even be far larger than CO2. The organic materials trapped in the shallows of dams are converted also into the potent greenhouse gas HHCHH and the well known gas CO2. This also makes hydroelectric energy not green house gas free.

There is a NOBEL prize that she now needs.

There will be no Federal funding available to find out if air CO2 levels were ever higher in the past millions of years than they are now. ..HG..


"Dams can no longer be considered green house gas production free." ..but

Dams are not scalable for sure limited no.s and while they may in fact release high CO2, the amount varies hugely in some instances down to 0 + Infrastructure (cement etc), The poor performers should be suitable for Carbon capture if we consider the cold and pressure concentrates a CO2 source.

richard schumacher

Anyone who thinks that impounded water causes global warming needs to consider this question: have you ever seen it raining CO2? (The answer is "no", and the reasons why are highly relevant.)


The percent of open water surfaces created by dams versus natural oceans, lakes, rivers is very small and much smaller than the new open water surfaces being created by melting polar ice, glaciers etc.

Things have to be put in perspective.

Warmer temperatures could do much more to increase open water surfaces in the next 100 years. More open water surface will create more evaporation, more humidy, more rain, more snow in many areas but not everywhere. Many areas may get even dryer yet while others will be flooded.

Try to establish what it will be like in all areas is a challenge.

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