Climatic Atlas of Texas
REFERENCE MATERIAL
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Climatic Atlas of Texas
LP-192 TEXAS DEPARTMENT OF WATER RESOURCES
DECEMBER 1983
CLIMATIC ALTAS OF TEXAS
By Thomas J. Larkin and George W. Bomar
Meteorologists
LP-192 Texas Department of Water Resourc;es
December 1983
TEXAS DEPARTMENT OF WATER RESOURCES
Charles E. Nemir, Executive DirectOlr
TEXAS WATER DEVELOPMENT BOARD
Louis A. Beecherl Jr., Chairman Glen E. Roney W. O. Bankston
George W. McCleskey, Vice Chairman Lonnie A. "Bcl" Pilgrim Louie Welch
TEXAS WATER COMMISSION
Felix McDonald, Chairman
Lee B. M. Biggart, Commissioner
Ralph Roming. Commissioner
Authorization for use or reproduction of any original material contained in this publication. i. e., not obtained from other sources, is freely granted fhe Department would appreciate acknowledgement.
Published and distributed by the
Texas Department of Water Resources Post Office Box 13087 Austin, Texas 78711
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PREFACE
Climatological data is published in the form of tables wlith columns of numbers that indicate average conditions for a designated place. These data arE~ used to define climate in terms of precipitation, temperature, evaporation and wind-the primary components of climatic description. However, the use of rows and columns of numbers is awkward when trying to visualize and interpret the relative changes of climatic components over CI large area. The purpose of this atlas is to illustrate the statewide distribution of these primary Giimatic components. This is accomplished by.contour analysis of data points on state maps that delineate county shapes and show county names. These maps depict long-term averages of monthly and annual climatic conditions. The maps were analyzed by Department meteorologists.
The authors of this atlas wish to thank the Chief of the Weather and Climate Section, Robert F. Riggio, for his guidance and William H. Hanshaw for plotting the data; Bobbie R. Critendon in Surface Water Data for his review of the evaporation analyses; Data Systems staff members Carl A. Johnson and Marion H. Porterfor developing the computHr-generated wind roses; and Graphic Arts staff members Carey E. Johnson and Ellen A. Wadsworth for drafting the contour maps.
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ABSTRACT
Climate is the history of weather and is defined by the long-term averages of atmospheric variables such as precipitation, temperature, evaporation and wind. This atlas identifies "average" conditions of these four major components of climate through a series of maps and wind roses.
The maps depict the statewide distribution of monthly and annual values of average precipitation. average temperature. and average gross lake surface evaporation rates. Wind roses show the frequency of occurrence of average wind direction and speed in selected cities across the State.
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TABLE OF CONTENTS
Page
PREFACE. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .
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ABSTRACT . ..............................................................t ? . ? ? ?
iv
INTRODUCTION . ...................... " ................ " . . . . . . . . . . . . . . . . . . . . . .
1
AVERAGE PRECIPITATION . ......................... " . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Definition of Terms. . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .
4
Source of Data ............................................................
4
Period of Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Average Monthly Precipitation Maps. . . . . . . . . . . . . . . . . .. . . . .. . . . .. . . . . . . . . . . . . .
5
January............................ ............................ ...........
6
February. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
March....................................................................
8
April......................................................................
9
May...................................................................... 10
June. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . .. . . . .. . .. . . . .. . .. . . . .. . .. . . 11
July............................................ ........................... 12
Aug ust ........................................ ". . . . . . . . . . . . . . . . . . . . . . . . . . . 13
September .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
October................................................................... 15
November. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
December .............................................. " ......... " . .. .. . 17
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TABLE OF CONTENTS-Continued
Page
Average Annual Precipitation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 18 AVERAGE TEMPERATURE.. . .. . .. .. . .. . . .. . .. . . . . .. .. .. .. . . . .. . .. .. . .. .. . .. .. . 19
Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 19 Source of Data .............................................................. 19 Period of Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Average Monthly Low Temperature Maps ...................... ".............. 21
January .................................................... ". .. . . . . . . . . . . . 22 February. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 March.................................................................... 24 April...................................................................... 25 May...................................................................... 26 June...................................................................... 27 July....................................................................... 28 August.................................................................... 29 September . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 October. .......... ............... ......................................... 31 November. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 December. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Average'Monthly High Temperature Maps.. . .. . . . .. . . . . . . . . . . . . . . .. . .. . . . . . . . . 35 January. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . 36 February. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 March............... .................... ................................. 38 April................. ............................ ........................ . 39
vi
TABLE OF CONTENTS-Continued
Page
May...................................................................... 40 June ...................................... " . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . 41 July....................................................................... 42 August.................................................................... 43 September ........................................................... I ? ? ? ? 44 October........................................ .. ........ ................. 45 November............ .................... ..... ...... ....................... 46 December. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . 47 Average Annual Low Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . 48 Average Annual High Temperature. .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . . . . . . . 49 Average Annual Temperature. . . . . . . . . . . . .. . . . . . .. . . . .. . . . .. . . . . . . . . . . . . . . . . .. 50 AVERAGE GROSS LAKE SURFACE EVAPORATION RATES. . . . . . . . . . . . . . . . . . . . 51 Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Source of Data .............................................................. 51 Period of Record. . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Average Monthly Gross Lake Surface Evaporation Rate Maps. . . .. . . . . . . . . . . . . . . 53 January......................................................... .......... 54 February. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 March..................................................................... 56 April...................................................................... 57 May...................................................................... 58 June...................................................................... 59 July....................................................................... 60
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