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National Oceanic and Atmospheric Administration

Climate of 1999 - July
U.S. Regional and Statewide Analyses

Includes Year-To-Date Summary

National Climatic Data Center, 13 August 1999

Standard Regions for Temperature and Precipitation
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Through climate analysis, National Climatic Data Center scientists have identified nine climatically consistent regions within the contiguous United States which are useful for putting current climate anomalies into an historical perspective.

Additional information about current climate anomalies can be found at the respective Web Pages of the Southern Regional Climate Center, Western Regional Climate Center, Midwest Regional Climate Center, Southeast Regional Climate Center, High Plains Regional Climate Center, and the Northeast Regional Climate Center.

Additional information concerning drought conditions in portions of Georgia can be found at the University of Georgia's Cooperative Extension Service Web Page.

Additional drought information can be found at the Web Page for the National Drought Mitigation Center. The Center monitors current droughts both in the United States and worldwide.

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Table 1 shows precipitation and temperature ranks for each of the 9 regions and the nation for July 1999, the two-month period of June-July 1999, the six months of February-July 1999, and the past 12 months, August 1998-July 1999.

               PRECIPITATION AND TEMPERATURE RANKS, BASED
               ON THE PERIOD 1895-1999.  1 = DRIEST/COLDEST,
               105 = WETTEST/WARMEST FOR JULY 1999,
               105 = WETTEST/WARMEST FOR JUN-JUL 1999,
               105 = WETTEST/WARMEST FOR FEB-JUL 1999,
               104 = WETTEST/WARMEST FOR AUG 1998-JUL 1999.

                          JUL    JUN-JUL    FEB-JUL   AUG 1998-
      REGION              1999     1999       1999    JUL 1999
      ------              ----  ---------  ---------  ---------

                PRECIPITATION:

     NORTHEAST              9        3          5          6
     EAST NORTH CENTRAL   102       96        100         98
     CENTRAL                7       26         27         29

     SOUTHEAST              7       24          7         18
     WEST NORTH CENTRAL    41       42         76         94
     SOUTH                 14       40         46         87

     SOUTHWEST             82       83         85         72
     NORTHWEST             35       30         72         92
     WEST                  67       75         60         45

     NATIONAL              13       29         36         66

                TEMPERATURE:

     NORTHEAST             98      100        101        100
     EAST NORTH CENTRAL    95       91        100        103
     CENTRAL               94       89         91        102

     SOUTHEAST             83       56         61         98
     WEST NORTH CENTRAL    60       52         92        102
     SOUTH                 58       50         87        102

     SOUTHWEST             48       47         87        101
     NORTHWEST             23       29         34         79
     WEST                  39       56         43         57

     NATIONAL              84       64         93        103

It should be emphasized that all of the temperature and precipitation ranks in Tables 1 through 5 are based on preliminary data. The ranks will change when the final data are processed.

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Table 2 shows historical extremes for July, the 1961-1990 normal, and the July 1999 value for each of the 9 regions and the contiguous U.S. for precipitation and temperature.

                               PRECIPITATION (INCHES)
                             DRIEST     WETTEST   NORMAL  1999
         REGION            VALUE YEAR VALUE YEAR   PCPN   PCPN
         ------            ---------- ----------  ------ ------

        NORTHEAST           2.02 1968  6.57 1897   3.81   2.73
        EAST NORTH CENTRAL  0.85 1936  6.13 1993   3.61   5.31
        CENTRAL             1.47 1930  8.27 1958   4.25   2.54

        SOUTHEAST           2.94 1983 11.55 1916   5.56   4.03
        WEST NORTH CENTRAL  0.84 1917  5.56 1993   2.02   1.75
        SOUTH               1.34 1980  6.04 1950   3.03   2.13

        SOUTHWEST           1.00 1993  3.51 1911   1.83   2.32
        NORTHWEST           0.16 1953  2.05 1983   0.73   0.41
        WEST                0.00 1903  1.18 1984   0.34   0.33

        NATIONAL            1.78 1930  3.85 1950   2.74   2.33*

                            * PRELIMINARY VALUE, CONFIDENCE
                              INTERVAL + OR - 0.29 INCHES

                               TEMPERATURE (DEGREES F)
                             COLDEST    WARMEST   NORMAL  1999
         REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
         ------            ---------- ----------  ------ ------

        NORTHEAST           66.1 1962  73.8 1955   69.3   72.2
        EAST NORTH CENTRAL  64.0 1992  76.2 1936   70.2   72.8
        CENTRAL             71.9 1947  81.2 1901   75.3   78.4

        SOUTHEAST           76.3 1947  82.7 1993   78.6   80.1
        WEST NORTH CENTRAL  62.7 1915  77.4 1936   69.5   69.7
        SOUTH               78.0 1906  85.9 1980   81.3   81.7

        SOUTHWEST           70.1 1912  75.9 1901   73.6   73.2
        NORTHWEST           58.9 1993  70.6 1906   65.9   64.8
        WEST                69.0 1903  78.2 1931   73.8   73.6

        NATIONAL            71.4 1915  77.1 1936   73.9   74.7*

                            * PRELIMINARY VALUE, CONFIDENCE
                              INTERVAL + OR - 0.2 DEG. F.
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Table 3 shows statistics for selected river basins: Precipitation rankings are for the hydrologic year-to-date, October-July 1998-1999, where 1 = driest, and 104 = wettest, based on the period 1895 to 1999. Also shown is the areal percent of the basin experiencing severe or extreme long-term (Palmer) drought, and areal percent of the basin experiencing severe or extreme long-term (Palmer) wet conditions, as of July 1999.


                                  PRECIPITATION  % AREA  % AREA
    RIVER BASIN                       RANK        DRY     WET
    -----------                   -------------  ------  ------

    MISSOURI BASIN                    101          0.8%   34.7%
    PACIFIC NORTHWEST BASIN            93          0.0%   14.9%
    CALIFORNIA RIVER BASIN             44          8.8%    6.7%

    GREAT BASIN                        64          0.0%   20.5%
    UPPER COLORADO BASIN               74          0.0%    0.0%
    LOWER COLORADO BASIN               51          0.0%    7.8%
    RIO GRANDE BASIN                   68          0.0%    3.9%

    ARKANSAS-WHITE-RED BASIN          101          0.0%   59.2%
    TEXAS GULF COAST BASIN             74          0.0%    0.0%
    SOURIS-RED-RAINY BASIN            104          0.0%  100.0%
    UPPER MISSISSIPPI BASIN            99          0.0%   19.6%

    LOWER MISSISSIPPI BASIN            49          4.6%    0.0%
    GREAT LAKES BASIN                  61          0.0%    0.0%
    OHIO RIVER BASIN                   25         39.4%    0.0%
    TENNESSEE RIVER BASIN              62          0.0%    0.0%

    NEW ENGLAND BASIN                  28          9.0%    0.0%
    MID-ATLANTIC BASIN                  4         76.4%    0.0%
    SOUTH ATLANTIC-GULF BASIN          12          9.7%    0.0%

The river basin regions are defined by the U.S. Water Resources Council.

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Table 4 shows precipitation and temperature ranks for each of the 9 regions and the nation for the year-to-date, January-July 1999, based on the period 1895-1999. 1 = DRIEST/COLDEST, 105 = WETTEST/HOTTEST.


         REGION                PRECIPITATION  TEMPERATURE
         ------                -------------  -----------

        NORTHEAST                   34             98
        EAST NORTH CENTRAL         104            101
        CENTRAL                     50             88

        SOUTHEAST                   19             73
        WEST NORTH CENTRAL          74             92
        SOUTH                       59             95

        SOUTHWEST                   69             97
        NORTHWEST                   78             61
        WEST                        51             57

        NATIONAL                    57             98
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Table 5 shows historical extremes for January-July, the 1961-1990 normal, and the January-July 1999 value for each of the 9 regions and the contiguous U.S. for precipitation and temperature.

                               PRECIPITATION (INCHES)
                             DRIEST     WETTEST   NORMAL  1999
         REGION            VALUE YEAR VALUE YEAR   PCPN   PCPN
         ------            ---------- ----------  ------ ------

        NORTHEAST          16.63 1965 31.53 1996  23.49  21.94
        EAST NORTH CENTRAL 10.51 1988 22.73 1993  17.37  22.05
        CENTRAL            17.59 1936 34.59 1950  25.70  26.10

        SOUTHEAST          20.79 1986 39.59 1991  31.18  26.27
        WEST NORTH CENTRAL  6.98 1934 16.40 1993  11.12  11.90
        SOUTH              14.72 1925 29.92 1905  21.06  21.76

        SOUTHWEST           4.61 1972 12.68 1905   7.24   8.18
        NORTHWEST           8.46 1924 20.17 1983  15.35  16.87
        WEST                4.64 1924 20.76 1998   9.83   9.92

        NATIONAL           13.66 1934 20.71 1998  17.39  17.78

                               TEMPERATURE (DEGREES F)
                             COLDEST    WARMEST   NORMAL  1999
         REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
         ------            ---------- ----------  ------ ------

        NORTHEAST           41.9 1907  48.4 1921   44.5   46.8
        EAST NORTH CENTRAL  37.9 1912  48.1 1987   42.3   45.2
        CENTRAL             48.8 1978  57.1 1921   52.3   54.5

        SOUTHEAST           59.5 1940  64.6 1949   61.7   63.1
        WEST NORTH CENTRAL  37.9 1950  47.4 1934   42.8   44.8
        SOUTH               59.1 1979  64.8 1911   61.6   63.7

        SOUTHWEST           47.5 1917  55.0 1934   51.3   53.0
        NORTHWEST           42.5 1955  51.0 1934   46.2   46.2
        WEST                51.4 1913  57.8 1934   54.3   54.2

        NATIONAL            49.4 1979  54.5 1934   51.7   53.4

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Top of Page July 1999 Temperature and Precipitation

Based upon preliminary data, July 1999 was the 11th warmest July on record for the East-North Central Region. This is the first July since 1989 to be significantly above the long-term mean. Warm Region - July
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Cool Region - July
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Preliminary data for the Northwest Region ranked July 1999 as the 23rd coolest July since 1895. This contrasts sharply with the third warmest July on record which occurred just last year.
July 1999 was the fourth wettest July on record for the East-North Central Region. In contrast, last year the region noted the 14th driest July on record. Wet Region - July
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Dry Region - July
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Preliminary data for the Central Region ranked July 1999 as the 7th driest July since records began in 1895.
Preliminary data indicate that precipitation averaged across the Primary Corn and Soybean agricultural belt ranked near the long-term mean for growing season to date. The last ten such periods have averaged at or above the long-term mean for precipitation. Primary Corn and Soybean - July
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Top of Page July 1999 Statewide Temperature and Precipitation

July Tmp Map
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Thirteen states ranked within the top ten warm portion of the distribution for July 1999, including:
  • New Jersey - 2nd warmest
  • Rhode Island - 4th warmest
  • Massachusetts - 6th warmest
  • New York - 6th warmest
  • Ohio - 6th warmest

    No state ranked within the top ten cool portion of the distribution.

  • Nine states ranked within the top ten dry portion of the historical distribution for July 1999, including:
  • New Jersey - Driest
  • Florida - 3rd driest
  • Kentucky - 4th driest
  • West Virginia - 5th driest

    July 1999 was the second wettest July since 1895 for Wisconsin, fourth wettest for Michigan, and eighth wettest for Arizona.

  • July Pcp Map
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    Top of Page April-July 1999 Statewide Temperature and Precipitation

    Apr-July Temp Map
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    Twelve states were within the top ten warm portion of the distribution for temperature for April-July 1999, including:
  • Rhode Island - Warmest
  • Maine - 4th warmest
  • New Hampshire - 4th warmest
  • Vermont - 4th warmest
  • Massachusetts - 4th warmest
  • Connecticut - 5th warmest
  • Ohio - 5th warmest

    The same April-July period was the tenth coolest such period for Oregon and the ninth coolest for Washington.

  • Twelve states ranked within the top ten dry portion of the distribution for April-July 1999, including:
  • Delaware - Driest
  • Maryland - Driest
  • New Jersey - Driest
  • Rhode Island - Driest
  • Connecticut - 2nd driest
  • Massachusetts - 2nd driest
  • New York - 2nd driest
  • West Virginia - 2nd driest

    Six states ranked within the top ten wet portion of the distribution for the same period including:

  • Wisconsin - 3rd wettest
  • Colorado - 4th wettest
  • Utah - 5th wettest
  • Apr-July Pcp Map
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    Top of Page August 1998-July 1999 Statewide Temperature and Precipitation

    Aug-July Temp Map
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    Forty states were within the top ten warm portion of the distribution for temperature for the running twelve month period. Some August 1998-July 1999 ranks included:
  • Michigan - 2nd warmest
  • Minnesota - 2nd warmest
  • Rhode Island - 2nd warmest
  • Wisconsin - 2nd warmest

    Only California ranked within the cool third portion of the historical distribution.

  • Six states were within the top 10 dry portion of the distribution for the August 1998-July 1999 period including:
  • Maryland - Driest
  • New York - 2nd driest
  • Virginia - 2nd driest
  • West Virginia - 2nd driest

    Five states ranked with the top ten wet portion of the distribution for the same period. They included the second wettest such period for North Dakota, the fourth wettest for Minnesota, and the sixth wettest such twelve-month period since 1895 for Kansas and South Dakota.

  • Aug-July Pcp Map
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    It should be emphasized that all of the temperature and precipitation ranks on these maps are based on preliminary data. The ranks will change when the final data are processed.

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    For more information, refer to ...
    References:

    Thomas R. Karl and Albert J. Koscielny, 1982: "Drought in the United States: 1895-1981." Journal of Climatology, vol. 2, pp. 313-329.

    Thomas R. Karl and Walter James Koss, 1984: "Regional and National Monthly, Seasonal, and Annual Temperature Weighted by Area, 1895-1983." Historical Climatology Series 4-3, National Climatic Data Center, Asheville, NC, 38 pp.

    NOAA's National Climatic Data Center is the world's largest active archive of weather data. The preliminary temperature and precipitation rankings are available from the center by calling: 828-271-4800.

    Historical precipitation and temperature ranking maps are also available on the Internet at: http://nic.fb4.noaa.gov/products/analysis_monitoring/regional_monitoring/usa.html.

    NOAA works closely with the academic and science communities on climate-related research projects to increase the understanding of El Niño and improve forecasting techniques. NOAA's Climate Prediction Center monitors, analyzes and predicts climate events ranging from weeks to seasons for the nation. NOAA also operates the network of data buoys and satellites that provide vital information about the ocean waters, and initiates research projects to improve future climate forecasts. The long lead climate outlooks are available on the Internet at: http://nic.fb4.noaa.gov.

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    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
    151 Patton Avenue
    Asheville, NC 28801-5001
    fax: 828-271-4876
    phone: 828-271-4800
    email: ncdc.orders@noaa.gov
    For further information on the historical climate perspective presented in this report, contact:

    William Brown
    NOAA/National Climatic Data Center
    151 Patton Avenue
    Asheville, NC 28801-5001
    fax: 828-271-4328
    email: william.brown@noaa.gov
    -or-
    Mike Changery
    NOAA/National Climatic Data Center
    151 Patton Avenue
    Asheville, NC 28801-5001
    fax: 828-271-4328
    email: mchangry@ncdc.noaa.gov

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