 Introduction
| Anomalous warmth (using a 1992-2001 base period as shown in the adjacent blended product of satellite and in-situ data) was dominant across much of Canada and the western U.S., much of northwest Russia and southeastern Australia. While strong upper level ridges of high pressure controlled the weather in these areas during September, upper level troughs of low pressure (depicted by negative 500 millibar height anomalies) were situated across central Europe and eastern Siberia. Temperature anomalies calculated from in-situ station data using a 1961-1990 base period also show the cooler than average temperatures in these regions as well as over the eastern U.S.
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Temperature
- September 2001 global land and ocean temperature ranked as eighth warmest in the 1880 to present record and was 0.33°C (0.59°F)
above the long-term average (0.23°C / 0.41°F above the 1961-1990 mean)
- Temperatures averaged across land areas were fifth warmest for September, or 0.46°C (0.83°F) above average
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- Northern Hemispheric temperatures remained above average (0.30°C / 0.54°F above the mean), although no records were in jeopardy this month
- Temperatures averaged across the Southern Hemisphere were fourth warmest for September, or 0.40°C / 0.72°F above average using an 1880-present base period (0.25°C / 0.45°F above average using a 1961-1990 base period)
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Precipitation
- Several landfalling tropical storms and typhoons in the western Pacific provided locally excessive rainfall from Japan south into the northern Philippines
- Monthly precipitation surpluses of 100-200 mm (3.94-7.87 inches) were common across parts of central Europe
- Monsoon rains were much lighter than average across most of India
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Microwave Sounding Unit Data
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- September temperatures averaged in the lowest 8km (5 miles) of the troposphere were slightly below average (-0.05°C / -0.09°F)
- Northern Hemisphere temperatures in the lower troposphere were a bit warmer than average (0.04°C / 0.07°F), while Southern Hemisphere temperatures were a bit cooler than the 1979-1998 average (-0.14°C / -0.25°F)
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- September temperatures in the lower stratosphere were 0.27°C (0.49°F) below average
- This was the 9th consecutive September with cooler than average temperatures in the lower stratosphere
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Lower tropospheric and lower stratospheric temperature data are collected by NOAA's TIROS-N polar-orbiting satellites and adjusted for time-dependent biases by NASA and the Global Hydrology and Climate Center at the University of Alabama in Huntsville.
For additional details on precipitation and temperatures in September see the Global Regional page .
References:
Peterson, T.C. and R.S. Vose, 1997: An Overview of the Global Historical Climatology Network Database. Bull. Amer. Meteorol. Soc., 78, 2837-2849.
For all climate questions other than questions concerning this report, please contact the National Climatic Data Center's Climate Services Division:
Climate Services Division
NOAA/National Climatic Data Center
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Asheville, NC 28801-5001
fax: 828-271-4876
phone: 828-271-4800
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For questions about this report, please contact:
David Easterling
NOAA/National Climatic Data Center
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fax: 828-271-4328
email: David.Easterling@noaa.gov
-or-
Jay Lawrimore
NOAA/National Climatic Data Center
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Asheville, NC 28801-5001
fax: 828-271-4328
email: Jay.Lawrimore@noaa.gov
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