Spring 2015 Report

2015SpringRainfallTotalMap

Spring 2015 has been very wet, especially in Texas and Oklahoma. It has been dry out West and in the Northeast. Not too long ago, Texas and Oklahoma were begging for water as they were being oppressed by a severe drought. Now, they have too much water. Spring 2015 has been very wet for sure for them. How wet was it for them?

201505_Divisional_TotalPrecipitation

2015_MAM_Divisional_TotalAnomaly

It has been very wet for sure. I will not be reporting much on temperature for the 2015 Spring report as rain has been the main highlight. Let’s start with America.

America
Temperature: 53.15°F
Rainfall: 9.33

1895-2015 Spring Statistics
Spring Temperature Mean: 51.08°F
Spring Temperature Median: 50.86°F
Standard Deviation: 1.37

Spring Rainfall Mean: 7.94
Spring Rainfall Median: 7.95
Standard Deviation: 0.98
Driest: 10.40 (1957/1991)
Wettest: 5.58 (1925)

America had a wet Spring, which is from March to May.

Top 10 Wettest Spring (March To May) For America
1.) 1957/1991 10.40
2.) 1983 10.37
3.) 1973 10.36
4.) 1995 9.92
5.) 2011 9.76
6.) 1922 9.65
7.) 1912 9.62
8.) 1905 9.48
9.) 1975 9.35
10.) 1944/2015 9.33

Spring 2015 is the tenth wettest on record. The wettest Spring in America is in 1957 and 1991. Most of the wet springs happened in El Nino, which was either developing or weakening. A couple occurred in La Nina, which is vice verse with El Nino.

El Nino
1905
1912
1957
1973
1991
1995
2015

La Nina
1922
1944
1975
2011

Let’s break it down by months in terms of rainfall total. They are from 1895 to 2015.

March
2015: 2.14
March Rainfall Mean: 2.50
March Rainfall Median: 2.47
Standard Deviation: 0.49
Driest: 1.02 (1910)
Wettest: 4.00 (1973)

April
2015: 2.83
April Rainfall Mean: 2.52
April Rainfall Median: 2.52
Standard Deviation: 0.44
Driest: 1.46 (1987)
Wettest: 3.65 (1957)

May
2015: 4.36
May Rainfall Mean: 2.92
May Rainfall Median: 2.91
Standard Deviation: 0.50
Driest: 1.81 (1934)
Wettest: 4.36 (2015)

March 2015 is below average, but within standard deviation. April 2015 is above average, but within standard deviation. May 2015 is a very wet month. It is an outlier as it is the wettest May on record. In fact, May 2015 is the wettest month in America since 1895.

Top 10 Wettest Month For America
1.) May 2015 4.36
2.) October 2009 4.29
3.) June 1928 4.28
4.) May 1957 4.24
5.) May 1908 4.13
6.) May 1995 4.10
7.) March 1973 4.00
8.) November 1983 3.92
9.) May 1915 3.89
10.) July 1950 3.86

May 2015 is indeed the wettest month recorded for America. The previous wettest month on record is October 2009. Interesting to note that the wettest months mostly happen in Spring or Fall. The exception are in 1928 and 1950, which occurred in Summer. Fall and Spring have a lot of heavy rain because they are a transitional season from Winter or Summer as there are cold fronts or low pressure systems that clash with the warm and moist air causing storms to form. Five out of ten wettest months on record happened in May!

Texas
Temperature: 64.80°F
Rainfall: 16.34

1895-2015 Spring Statistics
Spring Temperature Mean: 64.75°F
Spring Temperature Median: 64.73°F
Standard Deviation: 1.76

Spring Rainfall Mean: 7.33
Spring Rainfall Median: 7.05
Standard Deviation: 2.31
Driest: 2.53 (2011)
Wettest: 16.34 (2015)

Top 10 Wettest Spring (March To May) For Texas
1.) 2015 16.34
2.) 1957 14.75
3.) 1905 12.59
4.) 1941 12.43
5.) 1900 12.36
6.) 2007 12.16
7.) 1922 11.97
8.) 1914 11.90
9.) 1997 10.85
10.) 1929 10.79

Spring 2015 is the wettest spring recorded period for Texas. The next wettest is in 1957, which is a rather distant second. Again, most of the wettest spring happened in El Nino with a few exception of La Nina.

El Nino
1900
1905
1914
1941
1957
1997
2007
2015

La Nina
1922
1929

Let’s break it down by months in terms of rainfall total. They are from 1895 to 2015.

March
2015: 3.47
March Rainfall Mean: 1.72
March Rainfall Median: 1.67
Standard Deviation: 0.85
Driest: 0.27 (2011)
Wettest: 4.47 (2007)

April
2015: 3.94
April Rainfall Mean: 2.30
April Rainfall Median: 2.04
Standard Deviation: 1.16
Driest: 0.57 (1983)
Wettest: 6.19 (1957)

May
2015: 8.93
May Rainfall Mean: 3.32
May Rainfall Median: 3.13
Standard Deviation: 1.35
Driest: 0.70 (1998)
Wettest: 8.93 (2015)

March 2015 is way above average and it is the fourth wettest March on record. Only 2007, 1926, and 1905 are wetter. April 2015 is also above average. It is the fourteenth wettest April on record as it ties with 2004. May 2015 is the wettest May on record! The second wettest May is a distant second in 1914 with 6.62 inches of rain recorded that time! No surprise as there has been severe flooding throughout Texas. In fact, May 2015 is the wettest month in Texas since 1895.

Top 10 Wettest Month For Texas
1.) May 2015 8.93
2.) June 2004 6.66
3.) May 1914 6.62
4.) September 1936 6.55
5.) May 1929 6.45
6.) May 1935 6.38
7.) September 1974 6.32
8.) October 1919 6.26
9.) April 1957 6.19
10.) November 2004 6.18

May 2015 is the wettest month for Texas and puts June 2004 to a distant second! Interesting to note that some of the wettest months occurred following a severe drought like 1919, 1957, and 2015. Prior to those months, there was a severe multi-year drought. It shows that droughts in Texas end in floods. Again, most of the wettest months are in Spring or Fall. Some of the wettest have occurred in hurricane season, which is no surprise as tropical storms and hurricanes can dump widespread heavy rain that leads to flooding. Interesting to see that 2004 has two of the wettest months on record for Texas, June and November.

Upper Texas Coast
Temperature: 70.43°F
Rainfall: 24.45

1895-2015 Spring Statistics
Spring Temperature Mean: 68.52°F
Spring Temperature Median: 68.40°F
Standard Deviation: 1.68

Spring Rainfall Mean: 10.50
Spring Rainfall Median: 9.92
Standard Deviation: 4.45
Driest: 2.43 (2011)
Wettest: 24.45 (2015)

Top 10 Wettest Spring (March To May) For Upper Texas Coast
1.) 2015 24.45
2.) 1997 22.18
3.) 1900 19.54
4.) 1957 19.32
5.) 1929 19.06
6.) 1914 18.54
7.) 1944 18.33
8.) 1993 18.32
9.) 1905 17.60
10.) 1941 17.46

Spring 2015 has been very wet for Upper Texas Coast. It exceeds Spring of 1997, which had been the wettest spring. El Nino is a factor for a wet spring, either intensifying or weakening. Only two occurred in La Nina.

El Nino
1900
1905
1914
1941
1944
1957
1993
1997
2015

La Nina
1929
1944

Let’s break it down by months in terms of rainfall total. They are from 1895 to 2015.

March
2015: 7.27
March Rainfall Mean: 2.89
March Rainfall Median: 2.34
Standard Deviation: 1.90
Driest: 0.11 (1916)
Wettest: 8.24 (1957)

April
2015: 7.25
April Rainfall Mean: 3.27
April Rainfall Median: 2.84
Standard Deviation: 1.97
Driest: 0.18 (1987)
Wettest: 8.45 (1991)

May
2015: 9.93
May Rainfall Mean: 4.34
May Rainfall Median: 3.81
Standard Deviation: 2.64
Driest: 0.08 (1998)
Wettest: 11.91 (1929)

March 2015 is very wet for the Upper Texas Coast. In fact, it is the sixth wettest March on record. Only 1957, 1997, 1926, 1900, and 1922. April 2014 is also very wet as it is the seventh wettest April on record. Only 1991, 1973, 1905, 1957, 1997, and 1979 are wetter. May 2015 is wet, but is the fifth wettest May on record. 1929, 1907, 1936, and 1944 are wetter. How wet was May 2015 for Upper Texas Coast and how does it compare.

Top 10 Wettest Month For Upper Texas Coast
1.) October 1949 16.69
2.) July 1900 13.85
3.) September 1979/October 1994 13.15
4.) June 1919 12.99
5.) November 2004 12.77
6.) June 1968 12.60
7.) December 1923 12.50
8.) June 2004 12.47
9.) October 2002 12.43
10.) July 2007 12.29

For the Upper Texas Coast, October 1949 is the wettest month on record. The next wettest month is July 1900, which is a distant second. Two of the wettest months happened in July, 1900 and 2007. Following those wet July, a hurricane made landfall. 1900 had the Great Galveston Hurricane, which is the deadliest disaster in American history that claimed 12,000 lives. The deaths were from storm surge, which is the biggest killer in a hurricane and tropical cyclone. 2007 had Humberto hit east of Houston exactly one year before Ike ravaged Southeast Texas. Humberto made landfall on the exact date and time of Ike, September 13 at 2:10 AM. Not surprised to see October 1994 and 2002 on the list as they had severe flooding that time.

May 2015 is not in the top 10 or even 20. It is in the top 40 wettest month of all times in the Upper Texas Coast going back to 2015. Why is that so? The coastal areas got less rain in May than inland areas.

To sum it up, Spring 2015 was a wet one for many. For others, it was a dry one. It shows if one area is wet, than the other area will be dry.

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