Kalshi's Houston market settles on the daily high at Hobby (KHOU), not Bush Intercontinental (IAH), as the climate report CLIHOU and The Weather Company publish it. Series KXHIGHTHOU, listed since Feb 11, 2026.
Updated Oct 30, 5:21 AM CDT: newest final official high is for Thu, Oct 29.
William P. Hobby Airport, Houston
Not Bush Intercontinental (IAH).
1:00 AM Oct 31 to 1:00 AM Nov 1 CDT
Midnight to midnight CST, local standard time: 1:00 AM to 1:00 AM on Houston's clock while daylight saving is on.
Today's six brackets, in whole degrees
Since Aug 14, 2026, 5 of 77 days (6%) settled on a tail bracket: 5 below the bottom bracket and 0 above the top one. In the last 30 days: 3 of 30.
| Day | Settled on | Winning bracket | Time of high (LST) | Settled at |
|---|---|---|---|---|
| Thu, Oct 29 | 83° | 82° to 83° | 2:03 PM | Oct 30, 7:10 AM CDT |
| Wed, Oct 28 | 82° | 81° to 82° | 3:18 PM | Oct 29, 7:10 AM CDT |
| Tue, Oct 27 | 75° | 79° or belowbottom tail | 4:54 PM | Oct 28, 7:09 AM CDT |
| Mon, Oct 26 | 82° | 81° to 82° | 12:55 PM | Oct 27, 7:10 AM CDT |
| Sun, Oct 25 | 81° | 81° to 82° | 12:32 PM | Oct 26, 7:10 AM CDT |
| Sat, Oct 24 | 84° | 83° to 84° | 2:21 PM | Oct 25, 7:10 AM CDT |
| Fri, Oct 23 | 86° | 85° to 86° | 3:17 PM | Oct 24, 7:10 AM CDT |
| Thu, Oct 22 | 84° | 84° to 85° | 4:24 PM | Oct 23, 7:10 AM CDT |
| Wed, Oct 21 | 84° | 83° to 84° | 3:56 PM | Oct 22, 7:10 AM CDT |
| Tue, Oct 20 | 83° | 82° to 83° | 3:33 PM | Oct 21, 7:10 AM CDT |
| Mon, Oct 19 | 80° | 80° to 81° | 1:10 PM | Oct 20, 7:11 AM CDT |
| Sun, Oct 18 | 75° | 74° to 75° | 3:51 PM | Oct 19, 7:14 AM CDT |
| Sat, Oct 17 | 72° | 71° to 72° | 3:54 PM | Oct 18, 7:10 AM CDT |
| Fri, Oct 16 | 79° | 79° to 80° | 2:31 PM | Oct 17, 7:10 AM CDT |
| Thu, Oct 15 | 90° | 89° to 90° | 1:47 PM | Oct 16, 7:10 AM CDT |
| Wed, Oct 14 | 91° | 91° to 92° | 1:43 PM | Oct 15, 7:10 AM CDT |
| Tue, Oct 13 | 92° | 91° to 92° | 2:28 PM | Oct 14, 7:09 AM CDT |
| Mon, Oct 12 | 90° | 90° to 91° | — | Oct 13, 7:09 AM CDT |
| Sun, Oct 11 | 90° | 89° to 90° | — | Oct 12, 7:10 AM CDT |
| Sat, Oct 10 | 86° | 87° or belowbottom tail | — | Oct 11, 7:10 AM CDT |
| Fri, Oct 9 | 92° | 91° to 92° | 3:16 PM | Oct 10, 7:10 AM CDT |
| Thu, Oct 8 | 92° | 92° to 93° | 2:23 PM | Oct 9, 7:10 AM CDT |
| Wed, Oct 7 | 91° | 91° to 92° | 4:09 PM | Oct 8, 7:10 AM CDT |
| Tue, Oct 6 | 91° | 90° to 91° | — | Oct 7, 7:11 AM CDT |
| Mon, Oct 5 | 88° | 87° to 88° | 2:23 PM | Oct 6, 7:12 AM CDT |
| Sun, Oct 4 | 79° | 80° or belowbottom tail | 10:26 AM | Oct 5, 7:12 AM CDT |
| Sat, Oct 3 | 89° | 88° to 89° | 3:41 PM | Oct 4, 7:12 AM CDT |
| Fri, Oct 2 | 92° | 91° to 92° | 1:04 PM | Oct 3, 7:12 AM CDT |
| Thu, Oct 1 | 91° | 90° to 91° | 2:26 PM | Oct 2, 7:12 AM CDT |
| Wed, Sep 30 | 93° | 93° to 94° | 2:21 PM | Oct 1, 7:11 AM CDT |
Source: Each market's result, settlement value and time: Kalshi's public market data; Time of the high: NWS climate reports for KHOU, via IEM
Over 348 days (Oct 30, 2025 to Oct 29, 2026), the median time of the official high was 2:59 PM local standard time, and half the highs came between 1:50 PM and 3:49 PM. Over the last 55 days the median was 2:31 PM.
Hobby's high came before 1 AM standard time (1 to 2 AM daylight time) on 7 of 348 days (2%): the climate day's warmest minutes were its first.
KHOU report times, standard time. 16 without a time (MM) left out.
Source: NWS climate reports for KHOU, via IEM; IEM table of NWS climate reports
Kalshi's Houston market settles on Hobby (KHOU) and nothing else. Bush Intercontinental Airport (KIAH) publishes its own climate report, with its own daily high, which doesn't count.
Bush Intercontinental Airport (KIAH) against Hobby, 39 km apart
Over 364 days (Oct 21, 2025 to Oct 20, 2026), the two official highs were the same whole degree on 75 of 364 days (21%). Bush Intercontinental was warmer on 184 and cooler on 105, +0.3°F on average, and 2°F or more apart (a bracket's width) on 161.
Widest gaps: Feb 7, 2026, KIAH 77° and KHOU 72°; Jan 10, 2026, KIAH 66° and KHOU 73°.
Source: NWS climate reports for KIAH (CLIIAH), via IEM; NWS climate reports for KHOU, via IEM
Polymarket's Houston market settles on the same station, William P. Hobby Airport (KHOU), but reads it its own way: the highest of the day's hourly readings in whole °F, over the local calendar day, in 2°F ranges.
Kalshi vs Polymarket in Houston: the stations and the last 30 days side by side
On 180 days from May 1, 2026 to Oct 30, 2026, the NWS's afternoon preliminary report (usually "as of 4 PM" local time) had the same high as the final report on 152 of 180 days (84%). The final report came in higher on 28 and never lower.
27 of those 28 higher finals put the high after the 4 PM cutoff.
Source: Every NWS climate report issued for KHOU (CLIHOU), via IEM's text archive
The normal high for Oct 31 is 77°F and the record high is 90°F. The normal falls to 69°F by Nov 30.
364 final highs at KHOU, Oct 30, 2025 to Oct 29, 2026, against the normal and record each report printed.
Source: NWS climate reports for KHOU, via IEM; NOAA NCEI U.S. Climate Normals
Other reporting stations within 25 km (METARs only, no climate report): Houston/Ellington Arpt (KEFD, 12 km), Houston/Pearland Rgnl (KLVJ, 14 km), Houston/Rice Mem Hospital (KMCJ, 14 km), La Porte Muni (KT41, 21 km), Houston/SW Arpt (KAXH, 24 km).
Straight-line distances from KHOU; snapshot Oct 21, 2026.
Source: IEM's list of NWS climate-report sites; aviationweather.gov station information
William P. Hobby Airport, Houston (KHOU), the station named by the climate-report code CLIHOU in the market's rules. Not Bush Intercontinental (IAH).
Midnight to midnight CST, local standard time. During daylight saving that is 1:00 AM Oct 31 to 1:00 AM Nov 1 CDT.
Trading closes at 1:00 AM CDT after the day ends. Over the last 77 settled days the result posted a median of 6.2 hours after close.
78° or below, 79° to 80°, 81° to 82°, 83° to 84°, 85° to 86°, 87° or above, compared with Hobby's published whole-degree high. The two tails are strict.
On 5 of 77 settled days from Aug 14, 2026 to Oct 29, 2026 (6%): 5 on the bottom tail and 0 on the top tail.
Over 348 days to Oct 29, 2026, the median time of the official high at KHOU was 2:59 PM local standard time. On 7 of those days it came before 1 AM standard time.
From May 1, 2026 to Oct 30, 2026, the afternoon preliminary report's high matched the final report's on 152 of 180 days. The final was higher on 28 and lower on 0.
No. Only Hobby (KHOU) does. Over 364 days to Oct 20, 2026, KIAH's official high was the same whole degree as KHOU's on 75 days and 2°F or more apart on 161.
The rules every city shares · Reading CLIHOU · The Aug 14, 2026 change
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