Ensemble weather models from ECMWF and GFS, corroborated by Poland's IMGW forecasts, drive the strong 90.5% implied probability for Warsaw's highest temperature on March 16 at exactly 12°C, reflecting a mild but typical late-winter pattern with highs stabilizing around seasonal norms of 8-13°C amid weak Atlantic inflow. Historical data shows March 16 maxima averaging 9°C since 1951, with 12°C aligning with recent mild anomalies but below outlier warm days exceeding 18°C (top 5% historically). Trader consensus holds firm absent sudden southerly föhn winds or blocking highs, though a 2-3°C upside surprise from model biases or rapid front breakdown could elevate 13°C or 18°C+ odds before official measurements resolve via airport observations.