Kalshi's Atlanta market settles on the daily high at Hartsfield-Jackson (KATL), as the climate report CLIATL and The Weather Company publish it. Series KXHIGHTATL, listed since Feb 4, 2026.
Updated Oct 31, 4:21 AM EDT: newest final official high is for Fri, Oct 30.
Hartsfield-Jackson Atlanta International Airport
1:00 AM Oct 31 to 1:00 AM Nov 1 EDT
Midnight to midnight EST, local standard time: 1:00 AM to 1:00 AM on Atlanta's clock while daylight saving is on.
Today's six brackets, in whole degrees
Since Aug 14, 2026, 8 of 77 days (10%) settled on a tail bracket: 8 below the bottom bracket and 0 above the top one. In the last 30 days: 5 of 30.
| Day | Settled on | Winning bracket | Time of high (LST) | Settled at |
|---|---|---|---|---|
| Thu, Oct 29 | 76° | 76° to 77° | 3:20 PM | Oct 30, 7:10 AM EDT |
| Wed, Oct 28 | 75° | 74° to 75° | 2:01 PM | Oct 29, 7:10 AM EDT |
| Tue, Oct 27 | 74° | 74° to 75° | 3:55 PM | Oct 28, 7:10 AM EDT |
| Mon, Oct 26 | 71° | 71° to 72° | 3:37 PM | Oct 27, 7:11 AM EDT |
| Sun, Oct 25 | 70° | 69° to 70° | 4:13 PM | Oct 26, 7:10 AM EDT |
| Sat, Oct 24 | 70° | 69° to 70° | 3:04 PM | Oct 25, 7:10 AM EDT |
| Fri, Oct 23 | 73° | 72° to 73° | 3:29 PM | Oct 24, 7:10 AM EDT |
| Thu, Oct 22 | 76° | 76° to 77° | 3:43 PM | Oct 23, 7:11 AM EDT |
| Wed, Oct 21 | 75° | 74° to 75° | 3:41 PM | Oct 22, 7:10 AM EDT |
| Tue, Oct 20 | 76° | 76° to 77° | 3:30 PM | Oct 21, 7:10 AM EDT |
| Mon, Oct 19 | 70° | 70° to 71° | 4:02 PM | Oct 20, 7:10 AM EDT |
| Sun, Oct 18 | 67° | 66° to 67° | 3:51 PM | Oct 19, 7:10 AM EDT |
| Sat, Oct 17 | 67° | 67° to 68° | 3:31 PM | Oct 18, 7:10 AM EDT |
| Fri, Oct 16 | 84° | 83° to 84° | 2:44 PM | Oct 17, 7:10 AM EDT |
| Thu, Oct 15 | 88° | 87° to 88° | 2:23 PM | Oct 16, 7:10 AM EDT |
| Wed, Oct 14 | 87° | 87° to 88° | 3:04 PM | Oct 15, 7:10 AM EDT |
| Tue, Oct 13 | 87° | 86° to 87° | 3:17 PM | Oct 14, 7:10 AM EDT |
| Mon, Oct 12 | 84° | 83° to 84° | 2:40 PM | Oct 13, 7:10 AM EDT |
| Sun, Oct 11 | 70° | 70° or belowbottom tail | 2:23 PM | Oct 12, 7:10 AM EDT |
| Sat, Oct 10 | 68° | 68° or belowbottom tail | 4:06 PM | Oct 11, 7:10 AM EDT |
| Fri, Oct 9 | 73° | 75° or belowbottom tail | 2:02 PM | Oct 10, 7:09 AM EDT |
| Thu, Oct 8 | 85° | 84° to 85° | 2:24 PM | Oct 9, 7:10 AM EDT |
| Wed, Oct 7 | 80° | 79° to 80° | 4:44 PM | Oct 8, 7:11 AM EDT |
| Tue, Oct 6 | 78° | 78° to 79° | 3:49 PM | Oct 7, 7:11 AM EDT |
| Mon, Oct 5 | 76° | 76° or belowbottom tail | 5:00 PM | Oct 6, 7:12 AM EDT |
| Sun, Oct 4 | 78° | 78° to 79° | 12:44 PM | Oct 5, 7:12 AM EDT |
| Sat, Oct 3 | 86° | 86° to 87° | 3:26 PM | Oct 4, 7:12 AM EDT |
| Fri, Oct 2 | 84° | 85° or belowbottom tail | 3:36 PM | Oct 3, 7:12 AM EDT |
| Thu, Oct 1 | 86° | 85° to 86° | 4:27 PM | Oct 2, 7:12 AM EDT |
| Wed, Sep 30 | 87° | 87° to 88° | 3:33 PM | Oct 1, 7:12 AM EDT |
Source: Each market's result, settlement value and time: Kalshi's public market data; Time of the high: NWS climate reports for KATL, via IEM
Over 362 days (Oct 31, 2025 to Oct 30, 2026), the median time of the official high was 3:51 PM local standard time, and half the highs came between 2:50 PM and 4:36 PM. Over the last 60 days the median was 3:43 PM.
Hartsfield-Jackson's high came before 1 AM standard time (1 to 2 AM daylight time) on 10 of 362 days (3%): the climate day's warmest minutes were its first.
KATL report times, standard time. 2 without a time (MM) left out.
Source: NWS climate reports for KATL, via IEM; IEM table of NWS climate reports
Polymarket's Atlanta market settles on the same station, Hartsfield-Jackson International Airport (KATL), 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 Atlanta: the stations and the last 30 days side by side
On 183 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 128 of 183 days (70%). The final report came in higher on 55 and never lower.
54 of those 55 higher finals put the high after the 4 PM cutoff.
Source: Every NWS climate report issued for KATL (CLIATL), via IEM's text archive
The normal high for Oct 31 is 69°F and the record high is 86°F. The normal falls to 60°F by Nov 30.
364 final highs at KATL, Oct 31, 2025 to Oct 30, 2026, against the normal and record each report printed.
Source: NWS climate reports for KATL, via IEM; NOAA NCEI U.S. Climate Normals
Climate-report stations near Hartsfield-Jackson, and how their official highs ran against it. None settles the Atlanta market.
Straight-line distances from KATL; snapshot Oct 21, 2026.
Source: IEM's list of NWS climate-report sites; aviationweather.gov station information
Hartsfield-Jackson Atlanta International Airport (KATL), the station named by the climate-report code CLIATL in the market's rules.
Midnight to midnight EST, local standard time. During daylight saving that is 1:00 AM Oct 31 to 1:00 AM Nov 1 EDT.
Trading closes at 1:00 AM EDT after the day ends. Over the last 77 settled days the result posted a median of 6.2 hours after close.
70° or below, 71° to 72°, 73° to 74°, 75° to 76°, 77° to 78°, 79° or above, compared with Hartsfield-Jackson's published whole-degree high. The two tails are strict.
On 8 of 77 settled days from Aug 14, 2026 to Oct 29, 2026 (10%): 8 on the bottom tail and 0 on the top tail.
Over 362 days to Oct 30, 2026, the median time of the official high at KATL was 3:51 PM local standard time. On 10 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 128 of 183 days. The final was higher on 55 and lower on 0.
The rules every city shares · Reading CLIATL · The Aug 14, 2026 change
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