Long readsThe season picks the direction
ฤดูกาลเป็นคนเลือกทิศ
The bar argument assumes every month is the same month.
What it is
Clockwise against counter-clockwise is usually argued as if the road were the only variable. It is not. Four things change with the month — the light, the smoke, the water and what is flowering — and each of them argues for a direction.
The long version
Light. The circuit is ridden in a day-sized bite and most riders leave late morning. Clockwise, the long westward run from Pangmapha into Mae Hong Son is an afternoon leg, and in the cool season the sun is low and ahead of you on a two-lane road with oncoming traffic. Counter-clockwise puts that same stretch in the morning with the sun behind. Inference — this is the single most underrated argument in the whole question, and it gets stronger the closer to the solstice you go.
Smoke, March and April. The measured record says the smoke is worst in the afternoon of a still day and that it is worse in the basins than on the ridges. Riding a leg early gets the clearer air. Counter-clockwise reaches Mae Hong Son and the Pai basin later in the trip and later in the morning; clockwise gets Pai over with on the afternoon of day one. Inference — in the smoke months, whichever direction you pick, ride early and stop at two, and the direction matters less than the clock.
Water, June to October. Route 1263 — the Khun Yuam to Mae Chaem cut — is the part of this network that the rains actually close off as a sensible option, and it is also the steepest. In the wet, drop it and stay on 108 and 1095. That removes one of the arguments for counter-clockwise, because the cut is easier taken as a descent toward Mae Chaem, which is the clockwise... no: the cut is ridden Khun Yuam to Mae Chaem going counter-clockwise only if you have already come down 108. Read the leg page.
Flowers, November. Doi Mae U-Kho above Khun Yuam turns yellow with Tithonia diversifolia for a few weeks in November, and Khun Yuam sits on the southern leg. Clockwise puts Khun Yuam on day three or four, counter-clockwise on day two. If the bloom is the reason for the trip, go the way that reaches Khun Yuam on a morning.
Mist, November to January. The sea of mist off Doi Kong Mu and at Pang Ung is a dawn phenomenon, so it requires sleeping in Mae Hong Son and getting up. Both directions can deliver that; what matters is that Mae Hong Son gets two nights, not one.
Runs with
- storyClockwise or counter-clockwise — The argument before the season is added to it.
- storyThe smoke — The four years of figures behind the March advice.
- eventThe Bua Tong bloom — The November reason to reach Khun Yuam early.
- eventThe rains — Why the 1263 comes off the plan from June.
- legThe 1263 cut — The leg the rains argue about.
- watWat Phra That Doi Kong Mu — The dawn that needs a second night in Mae Hong Son.
- hazardThe low sun — The hazard the light argument is about.
Named here by
- legSoppong to Mae Hong Son — The argument this leg supplies.
- watWat Phra That Doi Kong Mu — Why this needs two nights in town.
- hazardThe low sun — The argument this hazard feeds.
- eventThe Bua Tong bloom — Why the bloom argues for a direction.
- eventThe rains — What it does to the route order.
- storyThe smoke — What the smoke does to the choice of direction.
- storyClockwise or counter-clockwise — The same question, answered month by month.
Where each claim comes from
| Field | Tier | Source | Note |
|---|---|---|---|
| default | inference | the four arguments are this project reasoning from cited seasonal facts and from the measured shape of the road | |
| text.story | inference | ||
| text_th | inference | written in Thai by this project, not machine-translated |
Sources
- Open-Meteo Air Quality API (Copernicus CAMS) — Open-Meteo
- Tithonia diversifolia — Wikipedia (en)
- Monsoon — Wikipedia (en)
- Curve and distance measurements off the OSM polyline — This project
cited Cited — a named source, linked · harvested Harvested — fetched from an open dataset, with its licence · tradition Tradition — general knowledge of the tradition, hedged · inference Inference — this project's own reasoning from the above · field Field — someone stood there