Houston Rainf Frequency-Weather Research Center, January 7, 1998

Weather Research Center

HOUSTON RAINFALL FREQUENCY [Inches]
Recurrence Intervals for the Duration Periods Indicated
1 Year 2 Year 5 Year 10 Year 25 Year 50 Year 100 Year

30 Minute 1.6 1.9 2.4 2.7 3.1 3.4 3.8
1 Hour 2.0 2.4 3.0 3.4 3.8 4.2 4.6
2 Hour 2.4 2.9 3.8 4.3 5.0 5.5 6.0
3 Hour 2.6 3.3 4.1 4.8 5.5 6.3 7.0
6 Hour 3.0 3.8 5.0 6.0 7.0 7.8 8.8
12 Hour 3.5 4.5 6.0 7.2 8.5 9.8 11.0
24 Hour 4.0 5.3 7.0 8.6 10.0 11.4 13.0
For example: Houston has a 1/10th chance of receiving 3.4 inches of rain in 1 hour in any year.
Weather Research Center
5104 Caroline St. Houston, Texas 77004
(713) 529-3076

	1 Year	2 Year	5 Year	10 Year	25 Year	50 Year	100 Year
30 Minute	1.6	1.9	2.4	2.7	3.1	3.4	3.8
1 Hour	2.0	2.4	3.0	3.4	3.8	4.2	4.6
2 Hour	2.4	2.9	3.8	4.3	5.0	5.5	6.0
3 Hour	2.6	3.3	4.1	4.8	5.5	6.3	7.0
6 Hour	3.0	3.8	5.0	6.0	7.0	7.8	8.8
12 Hour	3.5	4.5	6.0	7.2	8.5	9.8	11.0
24 Hour	4.0	5.3	7.0	8.6	10.0	11.4	13.0