Not the OP, but for a random datapoint on a slow machine that is capable
of weewx, I ran the query against a DB that starts roughly 2017-12-26,
on a 1G RPI3 with filesystem on uSD, and got no rows and:

Run Time: real 17.919584 user 1.634768 sys 1.655089


The same query for outTemp

sqlite> SELECT dateTime, outTemp FROM archive WHERE outTemp IS NOT NULL ORDER 
BY dateTime DESC LIMIT 1;
╭────────────┬─────────╮
│  dateTime  │ outTemp │
╞════════════╪═════════╡
│ 1785889200 │    72.4 │
╰────────────┴─────────╯
Run Time: real 0.000624 user 0.000455 sys 0.000182

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