An Investigation of Clouds and Precipitation for the Texas High Plains Page: 68
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68
at AmErillo. At Lubbock the long term mean is based on the period from 1911
until 1968. The results of this comparison are shown in Table 7, which also
shows the mean monthly precipitation based on 30 years of data for 28 selected
stations, and the total monthly precipitation for the wet and dry months based
on these same 28 stations. Columns 4, 5, 7 and 8 are based on the longer
periods of record at Amarillo and Lubbock.
Table 7. Precipitation During Wet and Dry Months
% Above % Above % Above % Above
Month Mean Dr AMA LBB Wet AMA LBB
April 1.57 0.28 90 86 3.43 8 7
May 3.32 1.09 86 82 5.39 13 11
June 2.60 0.66 89 83 4.39 20 20
July 2.48 1.23 78 68 6.65 7 2
August 2.15 0.91 83 72 2.01 67 44
September 2.04 0.13 96 96 2.63 34 36
October 2.05 0.00 100 100 5.35 5 9
As an example in interpreting the table, note that the total precip-
itation for the dry April (1956) was 0.28 inches while that for the wet April
(1957) was 3.43 inches. This compares to a 30-year mean precipitation of 1.57
inches. Comparing these values with the ogives based on the total period of
record it is shown that 90% of the months at Amarillo had greater amounts of
precipitation than the dry month considered in this research. At Lubbock, 86%
of the months were greater. As far as the wet month is concerned, only 8% of
the Aprils at Amarillo and 7% of the Aprils at Lubbock had more precipitation
than the wet month considered in this research.
In general, it can be seen that the months selected as being charac-
teristic of wet and dry periods were truly representative. The only exception
is the wet August. Note that 67% of the Augusts at Amarillo and 44% of Lubbock
had a greater amount of precipitation than August 1957. This indicates that
there were no Augusts during the period from 1952 until 1963 which had excessive
precipitation compared to the long-term mean. Note that in the case of October
1952 there was no measurable precipitation during the month. This month is the
driest month on record for the entire United States (Namias, 1960).
B. Clouds During Wet and Dry Months
Tables 8 and 9 are tabulations of cloud frequency and amount for wet
and dry months at Amarillo and Lubbock respectively. With the exception of
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Haragan, Donald R. An Investigation of Clouds and Precipitation for the Texas High Plains, report, March 1970; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth839452/m1/80/?q=%22~1~1%22~1&rotate=270: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.