Marking London Session Boundaries on a Monday Open
Monday opens carry extra noise. Sunday's close bleeds into the first Asian hours, and if you draw your London session box too early, you will absorb price action that belongs to a different context.
Here is the sequence we teach on the first page of the session range workbook when Monday arrives:
- Wait until 07:00 GMT before marking any London boundary. Prior highs and lows before that time belong to the Asian continuation, not the London session proper.
- Mark the highest high and lowest low between 07:00 and 12:00 GMT as provisional session extremes. Use a light pencil line — you may adjust once New York activity begins.
- At 12:00 GMT, review whether the morning range held. If price spent more than forty minutes outside the box without a clear sweep, widen the range by including that excursion.
- Record the final London high and low in the workbook margin with the date and instrument name. Consistency matters more than catching every wick.
On the chart example we use in class — EURUSD from a Monday in November 2025 — the provisional low at 08:45 GMT was swept by twelve pips at 10:20 before price returned inside the range. Participants who marked the sweep note separately from the boundary line found it easier to compare against Thursday's behaviour later in the week.
If you trade indices, apply the same clock but check your broker's session definitions. The rule structure stays the same; the timestamps may shift by thirty minutes depending on your data feed.