July Climate Information
|
Location |
Normal Monthly Temp.
|
Normal High
|
Normal Low
| All time High
| All time Low
|
Normal Rainfall
| All Time
Driest
| All Time
Wettest
|
|
Austin/Mabry |
84.2 |
95.0 |
73.4 |
109 |
57 |
1.97 |
0 |
12.80 |
|
Austin/Bergstrom |
84.6 |
95.2 |
74.0 |
106 |
62 |
1.61 |
0 |
9.77 |
|
Del Rio |
85.3 |
96.2 |
74.3 |
111 |
63 |
2.02 |
T |
13.18 |
|
San Antonio |
84.3 |
94.6 |
74.0 |
106 |
60 |
2.03 |
0 |
16.92 |
Climatologically July is well known for when the Subtropical High
has strong influence on weather trends for Central
and South Central Texas.
July is on average one of the drier months of the year at Austin;
in the middle of one of the drier or wetter months of the year at San Antonio;
and slightly one of the wetter months on average at Del Rio.
The 30 Year 1971 to 2000 Normals and 1856 to 2004 July Averages
show July as the 2nd driest month of the year at Austin Mabry.
At Austin Bergstrom July is the 2nd driest month from the 30 Year Normals,
and the Driest Month from the 1943 to 2004 averages.
The 30 Year 1971-2000 Normals show July as the 5th driest at
San Antonio. The 1871 to 2004 average for San Antonio shows July in the middle,
as 6th driest or 6th wettest of all 12 months. At Del Rio, the
30 Year 1971 to 2000 Normals show July the 4th wettest
of all 12 months, while the 1906 to 2004 average for July at Del Rio
shows July as the 5th wettest month.
July Rainfall extremes illustrate vast contrast between no rain and extreme flood.
July is in the top 10 for wettest and driest months for Austin and San
Antonio. The driest months for Austin end up with no rain in July of 1871, 1884,
1895 and 1962 to the 7th wettest overall month, July 1919, and 10th wettest month, July
of 1903. For San Antonio one of the driest months
of record with no rain was in
July 1871 to the 2nd wettest month of record in July 2002, with 16.92
inches of rain.
In July 1976 a 3 week period of rains
brought floods to the west part of South Central Texas and
Del Rio from around July 3rd to 20th. July 1976 was the wettest July of Record for Del Rio
with 13.18 inches.
Twenty Six Years later in July 2002 another July flood came to Central and South Central Texas.
During this event, the heaviest rains fell to the north
through northwest of San Antonio.
July 2003 was another July with above average rainfall from the
affects of the remnants of Hurricane Claudette, as it moved inland
over South Central Texas and continued west to parts of West Texas.
July 2003 was the 4th wettest July at San Antonio with 8.12 inches
and the 7th wettest July at Del Rio with 5.34 inches.
Looking further into climate records shows other summer floods. For Austin July of 1919, with 12.80
inches, was the wettest July of record. Rainfall variability was very
extreme in the 1950s, when from 1951-1956 drought years came. Although these were drought years, it was briefly interrupted by floods in
1952 and in the summer of 1954.
The 1954 flood was the result of the remnants of Hurricane Alice that moved near and
north of Del Rio in late June of 1954. In the midst of a long drought, a flood occurred from north of
Del Rio, down stream on the Rio Grande River to Eagle Pass to Laredo and south
of Laredo. Over 30 inches of rain fell north of Del Rio. in late June of 1954.
In July 1954, from July 27 to 30,
Tropical Storm Barbara affected parts of
Southeast Texas. In 1979, 25 years later, Tropical Storm Claudette moved to Southeast
Texas and caused floods.
The drought of 1970/1971 began to end at the end of July 1971 as
very wet conditions followed in early August of 1971 with floods west of San
Antonio. A Texas Hill Country and South Central Texas flood originated from the
remnants of Tropical Storm Amelia, that formed July
31, 1978 east of Brownsville, and moved to the Texas Hill Country in early August of 1978. This
caused 48 inches of rain in 52 hours near Medina, Texas. In the following
summer, the summer of 1979, Austin Bergstrom had 9.77 inches of rain in July, the
wettest July of record at Austin Bergstrom.
The dry periods around July are also worth mentioning. In the summer of
1993, the month of July was very dry, in wake of floods in the Spring of 1993
and also in June of 1993. There was 65 consecutive days of no measurable rain in Austin from June 27th to August
30, 1993. For San Antonio, in the summer of 1993 there was 63 consecutive days of
no measurable rain from June 27th to August 28th, 1993. Of the 20 driest
months for San Antonio since 1871, 4 occurred in July, with no rain in July of
1871 and 1944 to a Trace of rain in July of 1984 and 1993. For Austin
among the 20 driest months since 1856, 4 have also occurred in July with no rain
measured in July of 1871, 1884, 1895, and 1962.
The driest Julys at Austin Bergstrom was no rain in July of 1947 and a trace of
rain in July of 1993.
For Del Rio, the driest Julys of record
was a trace of rain in 1951, 1953, 1956,
1957 and 1998.
Although July and August are on average the hottest months,
the extremes in heat vary. Some of the hottest Julys of record for average
temperature came in July of 1980 and July of 1998. July 1980 and July 1998
tied as the warmest month and warmest July of Record for San Antonio.
July 1998 was by far the warmest month and warmest July of Record for Del Rio.
July 1980 at Del Rio was the 2nd warmest July of Record.
At Austin Mabry July 1998 was the 3rd warmest and July 1980 the 4th warmest
July of Record. The warmest July and month of Record for Austin was July 1860.
At Austin Bergstrom July 1980 was the 4th warmest of Record and July 1998
the 6th warmest of Record. The warmest July of Record at Austin
Bergstrom was July 1954.
During July flood events in the past, a few days had daytime
highs only in the 70s to near 80, like in July of 1976 and July of 2002.
July 1976 was the coolest of Record for Del Rio and
Austin Bergstrom.
For San Antonio, July of 1976 ties with July 1903 for the
coolest July of Record.
At Austin Mabry July 1976 was the 4th
coolest of Record. July 1907 was the coolest of Record for
Austin Mabry.
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