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National Oceanic and Atmospheric Administration

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

Includes Year-To-Date Summary

National Climatic Data Center, 14 July 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 June 1999, the two-month period of May-June 1999, the six months of January-June 1999, and the past 12 months, July 1998-June 1999.

                         JUNE   MAY-JUN    JAN-JUN   JUL 1998-
     REGION              1999     1999       1999    JUN 1999
     ------              ----  ---------  ---------  ---------

               PRECIPITATION:

    NORTHEAST              8        3         41          7
    EAST NORTH CENTRAL    60       83         94         76
    CENTRAL               68       41         68         49

    SOUTHEAST             65       40         26         20
    WEST NORTH CENTRAL    54       64         75         99
    SOUTH                 69       52         66         86

    SOUTHWEST             69       51         49         70
    NORTHWEST             36       39         84         93
    WEST                  68       33         50         46

    NATIONAL              56       37         61         74

               TEMPERATURE:

    NORTHEAST             90       97         97         99
    EAST NORTH CENTRAL    67       87         99        102
    CENTRAL               67       70         86        100

    SOUTHEAST             25       23         71        101
    WEST NORTH CENTRAL    51       48         93        102
    SOUTH                 41       52         98        104

    SOUTHWEST             51       47         99        101
    NORTHWEST             49       28         70         94
    WEST                  59       54         61         63

    NATIONAL              55       59         97        103

It should be emphasized that all of the temperature and precipitation ranks in Tables 1 through 4 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 June, the 1961-1990 normal, and the June 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           1.60 1988  8.53 1972   3.84   2.23
       EAST NORTH CENTRAL  1.41 1910  6.68 1967   3.89   4.20
       CENTRAL             1.03 1988  9.10 1928   3.95   4.53

       SOUTHEAST           2.20 1931  8.37 1900   4.86   5.30
       WEST NORTH CENTRAL  1.25 1933  5.27 1947   2.73   2.80
       SOUTH               0.98 1933  6.85 1989   3.66   4.04

       SOUTHWEST           0.16 1916  1.93 1927   0.93   0.98
       NORTHWEST           0.32 1919  3.02 1947   1.48   1.17
       WEST                0.01 1935  1.14 1963   0.46   0.51

       NATIONAL            1.43 1933  4.19 1928   2.84   2.94*

                           * PRELIMINARY VALUE, CONFIDENCE
                             INTERVAL + OR - 0.25 INCHES

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

       NORTHEAST           60.3 1958  68.6 1943   64.4   66.9
       EAST NORTH CENTRAL  59.5 1969  72.4 1933   65.3   66.2
       CENTRAL             66.2 1903  77.6 1952   71.3   72.4

       SOUTHEAST           73.0 1955  80.8 1952   75.8   75.5
       WEST NORTH CENTRAL  56.7 1951  71.6 1988   63.2   62.2
       SOUTH               72.1 1903  83.8 1953   77.6   77.4

       SOUTHWEST           63.4 1907  72.8 1994   68.1   67.6
       NORTHWEST           54.9 1953  64.8 1918   59.9   58.8
       WEST                62.2 1944  74.0 1918   67.7   67.5

       NATIONAL            66.2 1907  72.0 1933   69.0   69.0*

                           * 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-June 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.

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

   MISSOURI BASIN                    101          0.8%   46.5%
   PACIFIC NORTHWEST BASIN            97          0.0%   19.8%
   CALIFORNIA RIVER BASIN             44         28.8%    6.7%

   GREAT BASIN                        59          0.0%   20.5%
   UPPER COLORADO BASIN               70          0.0%    0.0%
   LOWER COLORADO BASIN               27         38.8%    0.0%
   RIO GRANDE BASIN                   70          0.0%    3.9%

   ARKANSAS-WHITE-RED BASIN          102          0.0%   59.7%
   TEXAS GULF COAST BASIN             69          0.0%    0.0%
   SOURIS-RED-RAINY BASIN            103          0.0%   65.7%
   UPPER MISSISSIPPI BASIN            95          0.0%   18.3%

   LOWER MISSISSIPPI BASIN            53          4.6%    0.0%
   GREAT LAKES BASIN                  41          7.8%    0.0%
   OHIO RIVER BASIN                   38          9.2%    0.0%
   TENNESSEE RIVER BASIN              64          0.0%    0.0%

   NEW ENGLAND BASIN                  28          1.2%    0.0%
   MID-ATLANTIC BASIN                  6         39.4%    0.0%
   SOUTH ATLANTIC-GULF BASIN          21          9.7%    0.0%          

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

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Table 4 shows historical extremes for January-June, the 1961-1990 normal, and the January-June 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          13.83 1941 26.76 1998  19.68  18.83
       EAST NORTH CENTRAL  8.07 1988 18.00 1908  13.76  16.58
       CENTRAL            14.17 1988 29.56 1950  21.45  23.41

       SOUTHEAST          15.72 1898 32.59 1929  25.62  21.83
       WEST NORTH CENTRAL  5.82 1934 12.17 1944   9.10   9.90
       SOUTH              11.62 1925 26.73 1957  18.03  19.02

       SOUTHWEST           3.20 1972 10.94 1905   5.41   5.39
       NORTHWEST           8.06 1924 19.94 1953  14.62  16.47
       WEST                4.55 1924 20.40 1998   9.49   9.59

       NATIONAL           11.12 1988 17.87 1998  14.65  15.14

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

       NORTHEAST           37.4 1907  44.8 1998   40.4   42.5
       EAST NORTH CENTRAL  32.7 1912  44.0 1987   37.6   40.7
       CENTRAL             44.3 1978  53.4 1921   48.5   50.5

       SOUTHEAST           56.4 1978  62.1 1949   58.8   60.3
       WEST NORTH CENTRAL  32.9 1917  43.3 1987   38.3   40.7
       SOUTH               55.5 1979  62.2 1911   58.3   60.7

       SOUTHWEST           43.2 1917  51.5 1934   47.6   49.7
       NORTHWEST           39.1 1955  48.5 1934   43.0   43.1
       WEST                47.4 1933  55.1 1934   51.1   51.0

       NATIONAL            45.3 1917  51.0 1986   48.0   49.9
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Top of Page June 1999 Temperature and Precipitation

Based upon preliminary data, June 1999 was the 16th warmest June on record for the Northeast Region. Four of the last six such months have been much above the long-term mean. Warm Region - June
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Dry Region - June
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Preliminary data for the Northeast Region ranked June 1999 as the 8th driest June since records began in 1895. This contrasts sharply with the third wettest June on record which occurred just last year.
June 1999 was the 25th coolest June on record for the Southeast Region. In contrast, last year the region had the sixth warmest June on record. Cool Region - June
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Top of PageJanuary-June 1999 Temperature and Precipitation

Based upon preliminary data, January - June 1999 was the seventh warmest period on record for the East-North Central Region. In thirteen of the last twenty years, the temperature for the East-North Central Region over the period has averaged above the long-term mean. Warm Region - YTD
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Wet Region - YTD
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Preliminary data for the East-North Central Region ranked January - June 1999 as the 12th wettest period since records began in 1895. By comparison, the 1998 period was the second wettest on record.
January - June 1999 was the 26th driest period on record for the Southeast Region. This was the first time since 1990 that the period observed below normal precipitation. Dry Region - YTD
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Preliminary data indicate that precipitation averaged across the Primary Corn and Soybean agricultural belt ranked as the 29th wettest such growing season to date. The last four such periods have averaged above the long term mean for precipitation. Primary Corn and Soybean - June
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Top of Page June 1999 Statewide Temperature and Precipitation

June Tmp Map
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Six states ranked within the top ten warm portion of the distribution for June 1999.
  • Vermont - 3rd warmest
  • New Hampshire - 5th warmest
  • Maine - 6th warmest
  • Rhode Island 6th warmest
  • New York - 9th warmest
  • Massachusetts - 10th 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 June 1999 including:
  • Rhode Island - 2nd driest
  • Connecticut - 3rd driest
  • West Virginia - 3rd driest
  • Virginia - 4th driest

    June 1999 was the seventh wettest June on record for Alabama, the only state within the top ten wet portion of the distribution.

  • June Pcp Map
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    Top of Page January-June 1999 Statewide Temperature and Precipitation

    Jan-June Temp Map
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    Fifteen states were within the top ten warm portion of the distribution for temperature for the year-to-date. Some January-June 1999 ranks included the fifth warmest such six-month period on record for Colorado, Maine, New Hampshire, Rhode Island, Texas, and Wisconsin.

    No state ranked within the cool-third portion of the historical distribution for June.

    January-June 1999 was the ninth wettest such month since 1895 for Kansas. No state ranked within the top ten dry portion of the distribution.
    Jan-June 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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    Top of Page DROUGHT WATCH:

    Northeastern U.S. Precipitation Deficit

    The Northeast region (which includes the states from Delaware, Maryland, and Pennsylvania northeastward to Maine) has suffered from unusually dry conditions during the last three months. April-June 1999 ranked as the second driest such period this century, behind the record drought of the mid-1960's (1965 has the driest April-June). Nine of the last 12 months have been drier than normal. Unusually wet weather in January and March 1999 has helped keep the current year's drought from being more severe.
    NE Pcp Norm/Def
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    SE POR Pcp
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    Mid-Atlantic Precipitation Deficit

    The mid-Atlantic region (Chesapeake Bay area) continued to experience dry conditions in June, which exacerbated the long-term drought. This region has been suffering from drought since last summer. Nine of the last 12 months have been drier than normal, with seven months having precipitation departures of more than an inch below normal. The 12-month period, July 1998-June 1999, ranks as the second driest July-June on record. The second wettest July-June in this region, which occurred last year (1997-98), has helped prevent the current year's drought from having even greater impacts.
    Ches. Area Pcp Norm/Def
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    Ches. Area POR Pcp
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    Based on preliminary data, the three states in the Chesapeake Bay area (Maryland, Virginia, and Delaware) had the second driest May-June on record in 1999. Only May-June 1964 was drier, with 1986 a very close third. Primary Corn and Soybean - June
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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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