When Does Houston Reach 90 and 100 at IAH?

[Ptarmigan]

You have to wonder when does Houston reach 90 degrees? This is based on data data from IAH from 1970 to 2009.

Average Month To Reach 90
May

Median Month To Reach 90
May

Average Date To First Reach 90
May 5

Median Date To First Reach 90
May 9

Earliest Date To First Reach 90
February 20, 1986

Latest Date To First Reach 90
June 12, 1970


You wonder when does it first reach 100 in Houston. Interestingly, Houston does not see 100 degree days. In fact, there have been years were Houston never reached 100 degrees. This is based on data data from IAH from 1970 to 2009. Summers that did not reach 100 are:
1972-75
1979
1981-84
1989
1991-92
1996-97

Since 1998, Houston as always reached 100 degrees. There are no records that Houston has reached 100 degrees before June. Houston first reach 100 in July on average.

Average Month To Reach 100
July

Median Month To Reach 100
July

Average Date To First Reach 100
July 19

Median Date To First Reach 100
July 28

Earliest Date To First Reach 100
June 12, 1978

Latest Date To First Reach 100
September 1, 1985

[TexasMetBlake]

You may want to look at the first week of September 2000 or the last week of September 2005 (days after Rita). Both hit 100 degrees at IAH after Sept. 1st. In fact, both of those times WELL EXCEEDED 100 degrees if memory serves me right.

[Ptarmigan]

You may want to look at the first week of September 2000 or the last week of September 2005 (days after Rita). Both hit 100 degrees at IAH after Sept. 1st. In fact, both of those times WELL EXCEEDED 100 degrees if memory serves me right.

Yes, I know it hit 100 in September of 2000 and 2005. Both broke records and they were very hot.

However, I am looking when it first reach 100 in Houston. I am not looking at heat waves, just the first time in the year for KIAH to reach 100.

[TexasMetBlake]

You may want to look at the first week of September 2000 or the last week of September 2005 (days after Rita). Both hit 100 degrees at IAH after Sept. 1st. In fact, both of those times WELL EXCEEDED 100 degrees if memory serves me right.

Yes, I know it hit 100 in September of 2000 and 2005. Both broke records and they were very hot.

However, I am looking when it first reach 100 in Houston. I am not looking at heat waves, just the first time in the year for KIAH to reach 100.

I understand, but on your original post you have the latest 100 degree day as September 1st and that is not the case.

[Ptarmigan]

I understand, but on your original post you have the latest 100 degree day as September 1st and that is not the case.

What I meant to say is that it is the latest first time to reach 100 in Houston.

[TexasMetBlake]

Ahhhhh, I see what your saying now. Sorry, didn't mean to be so picky.

[Ptarmigan]

Ahhhhh, I see what your saying now. Sorry, didn't mean to be so picky.

Cool.

[wxman57]

I like all this talk about heat. I think my coat is becoming part of my body after wearing it constantly for 3 months...

[Ptarmigan]

I like all this talk about heat. I think my coat is becoming part of my body after wearing it constantly for 3 months...

I thought about you when I wrote it.

[Ptarmigan]

I think from now on, I will put standard deviation.

90
Standard Deviation
Month=0.845804
Day Of Year=24.242948

100
Month=0.874423
Day Of Year=22.623337

[wxman57]

At work, we have a number of yearly forecast contests. The current contest involves forecasting when IAH will reach 95 degrees for the first time this spring/summer. I picked a little later than average - June 14th at 4pm. We were discussing this at lunch and someone mentioned that he seems to remember summers in Houston when we did not reach 95. I find that hard to believe, but I don't have all the records in front of me. Your data show such a summer, Ptarmigan?

[Ptarmigan]

At work, we have a number of yearly forecast contests. The current contest involves forecasting when IAH will reach 95 degrees for the first time this spring/summer. I picked a little later than average - June 14th at 4pm. We were discussing this at lunch and someone mentioned that he seems to remember summers in Houston when we did not reach 95. I find that hard to believe, but I don't have all the records in front of me. Your data show such a summer, Ptarmigan?

I would be surprised if such a summer did not reach 95. Maybe in the 19th century following Tambora in 1815 and Krakatoa in 1883. Records of them are likely there, but are likely in bad condition due to aging.

From KIAH records, from 1970 to 2009, every year, we have reached 95. The latest date to first reach 95 was July 22, 1999. The earliest to reach 95 was May 19, 2003. However, we have had summers in Houston where it did not reach 100 as listed below:
1972-75
1979
1981-84
1989
1991-92
1996-97

[Ptarmigan]

Here is the line graph for when Intercontinental Airport first reaches 90 and 100.

[wxman57]

How about 95F? Our annual contest is for the first 95F at IAH.

[Ptarmigan]

How about 95F? Our annual contest is for the first 95F at IAH.

Here is the graph for first 95F day in Houston at KIAH from 1970-2009.

[wxman57]

Maybe you could adjust the axis of that spreadsheet to only cover about day 135-210? Would be easier to see what day the first 95 fell on if there were more divisions in the y-axis.

[Ptarmigan]

Maybe you could adjust the axis of that spreadsheet to only cover about day 135-210? Would be easier to see what day the first 95 fell on if there were more divisions in the y-axis.

Changed.

[Ptarmigan]

March 30, 1946 was quite warm at 96 degrees. Talk about a hot March day!

[Ptarmigan]

You have to wonder when does Houston reach 90 degrees? This is based on data data from Houston WB (1921 to 1969) IAH (1970-2009) from 1921 to 2009.

Average Month To Reach 90
Late April

Median Month To Reach 90
May

Average Date To First Reach 90
May 7

Median Date To First Reach 90
May 10

Earliest Date To First Reach 90
February 20, 1986

Latest Date To First Reach 90
June 12, 1970


First to reach 95.
Average Month To Reach 95
Late May

Median Month To Reach 95
June

Average Date To First Reach 95
June 14

Median Date To First Reach 95
June 15

Earliest Date To First Reach 95
March 30, 1946

Latest Date To First Reach 95
July 22, 1999


You wonder when does it first reach 100 in Houston. Interestingly, Houston does not see 100 degree days. In fact, there have been years were Houston never reached 100 degrees. This is based on data data from Houston WB (1921 to 1969) IAH (1970-2009) from 1921 to 2009. Summers that did not reach 100 are:
1922-23
1926
1928-29
1931
1933
1936
1938
1940-43
1946
1949-50
1952
1955-56
1959
1961
1965-68
1972-75
1979
1981-84
1989
1991-92
1996-97

Since 1998, Houston as always reached 100 degrees. There are no records that Houston has reached 100 degrees before June. Houston first reach 100 in July on average.

Average Month To Reach 100
July

Median Month To Reach 100
July

Average Date To First Reach 100
July 23

Median Date To First Reach 100
July 27

Earliest Date To First Reach 100
June 12, 1978

Latest Date To First Reach 100
September 1, 1985

[Ptarmigan]