N Summary from the United States Air Force
N Summary
N Summaries are means and percentage frequency tabulations for stations around the world. There are approximately 2674 worldwide stations with five or more years data for which the N Summary was prepared. The summaries were calculated using surface weather observations collated by the United States Air Force. The parameters in an N Summary are one or more of the following monthly, seasonal, and annual tabulations: 1. Percentage frequency of surface winds (kts) by day, hour and month, to 16 points of the compass, 2. Percentage frequency of surface winds (kts) (seasonal and annual) to 16 points of the compass, 3. Precipitation amounts (in.), 4. Mean frequency of daily maximum temperature (Deg. F), mean maximum, and extreme maximum temperature (Deg. F), 5. Mean frequency of daily minimum temperature (Deg. F), mean minimum and extreme minimum temperature (Deg. F), and mean daily temperature range (Deg. F), 6. Mean number of days favorable for indicated military operations, 7. Miscellaneous data; mean number of days of occurrence of various weather phenomena, 8. Mean number of days with indicated total and low cloud amounts (oktas), 9. Percentage frequency of observations with low clouds (amount in 8ths, height in feet) and visibility (miles) reported, 10. Relative humidity means, 11. Percentage frequency distribution of wind speed (kts) and temperature (Deg. F), 12. Percentage frequency of visibility (miles) and various atmospheric phenomena, 13. Mean number of days with specified phenomena, 14. Mean cloudiness (%), 15. Snow depth (in.), 16. Percentage frequency of surface winds (kts) to 8 points of the compass (monthly), 17. Percentage frequency of surface winds (kts) to 8 points of the compass/ seasonal, 18. Sea level pressure (mb), means, and standard deviations. Some of the tabulations are for all hours of the day while others may be for each 3-hourly, 6-hourly, or 12-hourly segment of the day, and in some cases, for only one observation a day.
Dataset Citation
- Cite this dataset when used as a source.
Dataset Identifiers
- NCEI Physical Archive Collection: NSUM
- gov.noaa.ncdc:C00130
ISO 19115-2 Metadata
gov.noaa.ncdc:C00130
Distribution Formats |
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Customer Engagement Branch NOAA National Centers for Environmental Information 1-828-271-4800 ncei.orders@noaa.gov |
Time Period | 1890-01-01 to 1978-12-31 |
Spatial Bounding Box Coordinates |
West: -180.0
East: 180.0
South: -90.0
North: 90.0
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Spatial Coverage Map |
General Documentation |
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Publication Dates |
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Data Presentation Form | Hardcopy image - image archived in analog format |
Dataset Progress Status | Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | Not planned |
Purpose | N Summaries were used to summarize the climates of various cities and countries around the world. These climatic summaries could be used in a wide variety of national and international decisions. |
Dataset Citation |
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Originators |
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Theme keywords |
Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords |
Global Change Master Directory (GCMD) Data Center Keywords
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Platform keywords |
Global Change Master Directory (GCMD) Platform Keywords
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Instrument keywords |
Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords |
Global Change Master Directory (GCMD) Location Keywords
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Stratum keywords |
Global Change Master Directory (GCMD) Location Keywords
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Lineage information for: dataset | |
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Lineage Statement | N Summaries were prepared by the U.S. Air Force Combat Climatology Center (AFCCC) and its predecessor, the Environmental Technical Application Center. |
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Lineage information for: repository | |
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Last Modified: 2023-09-07
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov