Reduce historical time series by averaging over time intervals - mysql

Question

I have a weather observation table with frequent entries - for simplicity let's consider just the temperature observations. The observations can be somewhat sporadic, but sometimes up to half a dozen occur in each clock hour interval. My goal is to run a procedure at, say, hourly intervals to find those historical hours that contain multiple temperature observations and find the average temperature and time and then to replace all those observations with the single averaged observation.
I have managed to compose a mysql query which creates an averaged temperature value for the hour interval (shown below) but am needing assistance to know how to take this one step further by actually replacing each hours observation entries with the single new average entry.
SELECT stationcode, AVG(temperature) as t_avg, COUNT(temperature) as t_count, FROM_UNIXTIME
(AVG(UNIX_TIMESTAMP(obs_datetime))) as datetime_avg, MINUTE(obs_datetime) as minute, HOUR(obs_datetime) as hour, DAY(obs_datetime) as day, MONTH(obs_datetime) as month, YEAR(obs_datetime) as year
FROM obs_table
WHERE stationcode='AT301'
GROUP BY hour, day, month, year
HAVING count(*) > 1
ORDER BY datetime_avg DESC
I am imagining that the solution might involve a join or a temporary table. Can anyone provide any sample code or hints as to how I can go about this?
Adding following due to a request for the table structure:
--
-- Table structure for table `obs_table`
--
CREATE TABLE `obs_table` (
`rec_id` bigint(12) UNSIGNED NOT NULL,
`stationcode` varchar(8) NOT NULL,
`obs_datetime` datetime NOT NULL,
`temperature` float DEFAULT NULL,
`temp_dewpt` float DEFAULT NULL,
`rel_humidity` float DEFAULT NULL,
`wind_dir_degs` float DEFAULT NULL,
`wind_avg_kmh` float DEFAULT NULL,
`wind_gust_kmh` float DEFAULT NULL,
`pressure_hpa` float DEFAULT NULL,
`visibility_m` float DEFAULT NULL,
`description` varchar(255) DEFAULT NULL,
`icon` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
--
-- Indexes for table `obs_table`
--
ALTER TABLE `obs_table`
ADD PRIMARY KEY (`rec_id`),
ADD UNIQUE KEY `stationcode` (`stationcode`,`obs_datetime`);