Global Surface Summary of the Day - GSOD

Global Summary of the Day

browse graphicGlobal Surface Summary of the Day GIS map
Global Surface Summary of the Day is derived from The Integrated Surface Hourly (ISH) dataset. The ISH dataset includes global data obtained from the USAF Climatology Center, located in the Federal Climate Complex with NCDC. The latest daily summary data are normally available 1-2 days after the date-time of the observations used in the daily summaries. The online data files begin with 1929 and are at the time of this writing at the Version 8 software level. Over 9000 stations' data are typically available. The daily elements included in the dataset (as available from each station) are: Mean temperature (.1 Fahrenheit) Mean dew point (.1 Fahrenheit) Mean sea level pressure (.1 mb) Mean station pressure (.1 mb) Mean visibility (.1 miles) Mean wind speed (.1 knots) Maximum sustained wind speed (.1 knots) Maximum wind gust (.1 knots) Maximum temperature (.1 Fahrenheit) Minimum temperature (.1 Fahrenheit) Precipitation amount (.01 inches) Snow depth (.1 inches) Indicator for occurrence of: Fog, Rain or Drizzle, Snow or Ice Pellets, Hail, Thunder, Tornado/Funnel Cloud Global summary of day data for 18 surface meteorological elements are derived from the synoptic/hourly observations contained in USAF DATSAV3 Surface data and Federal Climate Complex Integrated Surface Hourly (ISH). Historical data are generally available for 1929 to the present, with data from 1973 to the present being the most complete. For some periods, one or more countries' data may not be available due to data restrictions or communications problems. In deriving the summary of day data, a minimum of 4 observations for the day must be present (allows for stations which report 4 synoptic observations/day). Since the data are converted to constant units (e.g, knots), slight rounding error from the originally reported values may occur (e.g, 9.9 instead of 10.0). The mean daily values described below are based on the hours of operation for the station. For some stations/countries, the visibility will sometimes 'cluster' around a value (such as 10 miles) due to the practice of not reporting visibilities greater than certain distances. The daily extremes and totals--maximum wind gust, precipitation amount, and snow depth--will only appear if the station reports the data sufficiently to provide a valid value. Therefore, these three elements will appear less frequently than other values. Also, these elements are derived from the stations' reports during the day, and may comprise a 24-hour period which includes a portion of the previous day. The data are reported and summarized based on Greenwich Mean Time (GMT, 0000Z - 2359Z) since the original synoptic/hourly data are reported and based on GMT.

Cite this dataset when used as a source.

  • NCEI DSI 3505 (subset)
  • gov.noaa.ncdc:C00516
Online Access
Distribution Formats
  • CSV
  • fixed-length ASCII text
  • ArcGIS
  • KMZ
DistributorDOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Dataset  Point of Contact User Engagment and Services Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
828-271-4800
ncdc.orders@noaa.gov
General Documentation
  • Global Summary of the Day Landing Page
    Global summary of the day is comprised of a dozen daily averages computed from global hourly station data. Daily weather elements include mean values of: temperature, dew point temperature, sea level pressure, station pressure, visibility, and wind speed plus maximum and minimum temperature, maximum sustained wind speed and maximum gust, precipitation amount, snow depth, and weather indicators. With the exception of U.S. stations, 24-hour periods are based upon UTC times. Values are usually delayed 24-48 hours from the time of observation.
Publisher
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Originator
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Date(s)
  • publication: unknown
Data Presentation Form: Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete
Data Update Frequency: As needed
Purpose:Global summary of the day is comprised of a dozen daily averages computed from global hourly station data. Daily weather elements include mean values of: temperature, dew point temperature, sea level pressure, station pressure, visibility, and wind speed plus maximum and minimum temperature, maximum sustained wind speed and maximum gust, precipitation amount, snow depth, and weather indicators. With the exception of U.S. stations, 24-hour periods are based upon UTC times. Values are usually delayed 24-48 hours from the time of observation.
Time Period:1929-01-01  to  Present
Spatial Bounding Box Coordinates:
N: 90.0
S: -90.0
E: 180.0
W: -180.0
Spatial Coverage Map:
Theme keywords
  • Earth Science > Atmosphere > Air Quality > Visibility
  • Earth Science > Atmosphere > Atmospheric Electricity > Lightning
  • Earth Science > Atmosphere > Atmospheric Phenomena > Cyclones
  • Earth Science > Atmosphere > Atmospheric Phenomena > Fog
  • Earth Science > Atmosphere > Atmospheric Phenomena > Lightning
  • Earth Science > Atmosphere > Atmospheric Phenomena > Storms
  • Earth Science > Atmosphere > Atmospheric Phenomena > Tornadoes
  • Earth Science > Atmosphere > Atmospheric Pressure > Atmospheric Pressure Measurements
  • Earth Science > Atmosphere > Atmospheric Pressure > Sea Level Pressure
  • Earth Science > Atmosphere > Atmospheric Pressure > Surface Pressure
  • Earth Science > Atmosphere > Atmospheric Temperature > Air Temperature
  • Earth Science > Atmosphere > Atmospheric Temperature > Maximum/Minimum Temperature
  • Earth Science > Atmosphere > Atmospheric Temperature > Dew Point Temperature
  • Earth Science > Atmosphere > Atmospheric Winds > Surface Winds
  • Earth Science > Atmosphere > Precipitation > Freezing Rain
  • Earth Science > Atmosphere > Precipitation > Hail
  • Earth Science > Atmosphere > Precipitation > Precipitation Amount
  • Earth Science > Atmosphere > Precipitation > Rain
  • Earth Science > Atmosphere > Precipitation > Sleet
  • Earth Science > Atmosphere > Precipitation > Snow
  • Earth Science > Cryosphere > Snow/Ice > Snow Depth
  • Earth Science > Terrestrial Hydrosphere > Snow/Ice > Snow Depth
Data Center keywords
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Place keywords
  • Geographic Region > Global Land
Stratum keywords
  • Vertical Location > Land Surface
Use Constraints
  • Cite this dataset when used as a source.
  • NCEI cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NCEI makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Fees
  • Electronic downloads of the data are free, however fees may apply for data certifications and data distribution on physical media.
Lineage StatementThe Global Summary of the Day is a subset from the Integrated Surface Hourly dataset (DSI-3505) that allow for "on-the-fly" calculations for users.
Processing Steps
  • NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Source Datasets

Last Modified: 2016-01-15

For questions about the information on this page, please email: ncdc.metadata@noaa.gov