Simultaneous measurements of middle finger-tip temperatures and blood perfusion rates were made in hands exposed to 0°C air. Temperatures were measured by a thermocouple disk attached to the nail-bed of the finger. Blood perfusion was monitored by a laser-Doppler velocimeter probe attached to the palmar side of the finger-tip. Seven, 60-80 min long experiments were performed on 6 men. The subjects sat in a comfortable (20-22°C) environment while the test hand was inserted, at about heart level, into a small non-contacting environmental chamber. Results indicated a sharp drop in finger-tip temperature of 10.1 ± 2.0°C during the initial 2 min. The time-lag between the preceding changes in blood perfusion and the ensuing changes in temperatures was in the range of 2-7 (5.86 ± 1.73) min. Cold induced vasodilation was typically effected by triangular-like waves indicating 3 to 20-fold gradual opening-closing changes of the arterial supply of the finger-tip. Average finger-tip temperatures (11.8-15.5°C) showed much less variability among the subjects than did average blood perfusion rates (2.8-17.0 mL b mL - 1 t hr - 1 ). Results of this study were compared to an analytical model quantifying finger-tip temperature and good conformity was obtained.