Kalshi's Boston market settles on the daily high at Logan (KBOS), as the climate report CLIBOS and The Weather Company publish it. Series KXHIGHTBOS, listed since Feb 5, 2026.
Updated Oct 31, 4:21 AM EDT: newest final official high is for Fri, Oct 30.
Boston Logan 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 Boston's clock while daylight saving is on.
Today's six brackets, in whole degrees
Since Aug 14, 2026, 15 of 76 days (20%) settled on a tail bracket: 12 below the bottom bracket and 3 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 | 69° | 69° to 70° | 2:25 PM | Oct 30, 7:10 AM EDT |
| Wed, Oct 28 | 52° | 53° or belowbottom tail | 2:53 PM | Oct 29, 7:19 AM EDT |
| Tue, Oct 27 | 57° | 57° to 58° | 12:10 AM | Oct 28, 7:10 AM EDT |
| Mon, Oct 26 | 73° | 72° or abovetop tail | 3:21 PM | Oct 27, 7:11 AM EDT |
| Sun, Oct 25 | 62° | 62° to 63° | 12:51 PM | Oct 26, 7:10 AM EDT |
| Fri, Oct 23 | 53° | 52° to 53° | 2:37 PM | Oct 24, 7:10 AM EDT |
| Thu, Oct 22 | 65° | 65° or abovetop tail | 2:48 PM | Oct 23, 7:10 AM EDT |
| Wed, Oct 21 | 56° | 56° to 57° | 12:35 PM | Oct 22, 7:19 AM EDT |
| Tue, Oct 20 | 62° | 61° to 62° | 1:49 PM | Oct 21, 7:10 AM EDT |
| Mon, Oct 19 | 56° | 55° to 56° | 1:53 PM | Oct 20, 7:10 AM EDT |
| Sun, Oct 18 | 53° | 53° to 54° | 3:37 PM | Oct 19, 7:10 AM EDT |
| Sat, Oct 17 | 62° | 61° to 62° | 12:04 AM | Oct 18, 7:19 AM EDT |
| Fri, Oct 16 | 69° | 68° to 69° | 4:51 PM | Oct 17, 1:10 PM EDT |
| Thu, Oct 15 | 62° | 61° to 62° | 1:03 PM | Oct 16, 7:10 AM EDT |
| Wed, Oct 14 | 77° | 77° to 78° | 12:31 PM | Oct 15, 7:10 AM EDT |
| Tue, Oct 13 | 62° | 62° to 63° | 9:59 PM | Oct 14, 7:10 AM EDT |
| Mon, Oct 12 | 71° | 70° to 71° | 4:33 PM | Oct 13, 7:10 AM EDT |
| Sun, Oct 11 | 60° | 60° to 61° | 1:49 PM | Oct 12, 7:10 AM EDT |
| Sat, Oct 10 | 63° | 63° to 64° | 3:12 PM | Oct 11, 7:10 AM EDT |
| Fri, Oct 9 | 69° | 68° to 69° | 1:30 PM | Oct 10, 7:19 AM EDT |
| Thu, Oct 8 | 73° | 72° to 73° | 3:02 PM | Oct 9, 7:19 AM EDT |
| Wed, Oct 7 | 66° | 65° to 66° | — | Oct 8, 7:20 AM EDT |
| Tue, Oct 6 | 63° | 62° to 63° | 2:48 PM | Oct 7, 7:11 AM EDT |
| Mon, Oct 5 | 71° | 70° to 71° | 2:00 PM | Oct 6, 7:12 AM EDT |
| Sun, Oct 4 | 63° | 63° to 64° | 1:12 PM | Oct 5, 7:11 AM EDT |
| Sat, Oct 3 | 67° | 67° to 68° | 12:22 AM | Oct 4, 7:12 AM EDT |
| Fri, Oct 2 | 87° | 85° or abovetop tail | 12:52 PM | Oct 3, 7:12 AM EDT |
| Thu, Oct 1 | 79° | 79° to 80° | 12:33 PM | Oct 2, 7:21 AM EDT |
| Wed, Sep 30 | 66° | 68° or belowbottom tail | 6:53 PM | Oct 1, 7:12 AM EDT |
| Tue, Sep 29 | 66° | 66° to 67° | — | Sep 30, 7:11 AM EDT |
Source: Each market's result, settlement value and time: Kalshi's public market data; Time of the high: NWS climate reports for KBOS, via IEM
Over 349 days (Oct 31, 2025 to Oct 30, 2026), the median time of the official high was 2:47 PM local standard time, and half the highs came between 12:50 PM and 4:17 PM. Over the last 57 days the median was 2:15 PM.
Logan's high came before 1 AM standard time (1 to 2 AM daylight time) on 13 of 349 days (4%): the climate day's warmest minutes were its first.
KBOS report times, standard time. 15 without a time (MM) left out.
Source: NWS climate reports for KBOS, via IEM; IEM table of NWS climate reports
On 179 days from May 1, 2026 to Oct 30, 2026, the NWS's afternoon preliminary report (usually "as of 5 PM" local time) had the same high as the final report on 164 of 179 days (92%). The final report came in higher on 14 and lower on 1.
12 of those 14 higher finals put the high after the 5 PM cutoff. A final lower than the afternoon report means a reading was corrected or removed in between (1 day).
Source: Every NWS climate report issued for KBOS (CLIBOS), via IEM's text archive
The normal high for Oct 31 is 57°F and the record high is 81°F. The normal falls to 47°F by Nov 30.
364 final highs at KBOS, Oct 31, 2025 to Oct 30, 2026, against the normal and record each report printed.
Source: NWS climate reports for KBOS, via IEM; NOAA NCEI U.S. Climate Normals
Other reporting stations within 25 km (METARs only, no climate report): Milton/Blue Hills Observatory (KMQE, 19 km), Norwood Mem (KOWD, 23 km), South Weymouth (KNZW, 24 km).
Straight-line distances from KBOS; snapshot Oct 21, 2026.
Source: IEM's list of NWS climate-report sites; aviationweather.gov station information
Boston Logan International Airport (KBOS), the station named by the climate-report code CLIBOS 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 76 settled days the result posted a median of 6.2 hours after close.
51° or below, 52° to 53°, 54° to 55°, 56° to 57°, 58° to 59°, 60° or above, compared with Logan's published whole-degree high. The two tails are strict.
On 15 of 76 settled days from Aug 14, 2026 to Oct 29, 2026 (20%): 12 on the bottom tail and 3 on the top tail.
Over 349 days to Oct 30, 2026, the median time of the official high at KBOS was 2:47 PM local standard time. On 13 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 164 of 179 days. The final was higher on 14 and lower on 1.
The rules every city shares · Reading CLIBOS · The Aug 14, 2026 change
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