Yes, last night was serious challenge.
After several days of cooler disturbed weather that seemed to bring the hot season to a close, the heat came back yesterday, with daytime temps around 38, temperature in Jack and Dah's bedroom (where I am temporarily staying to hide from my girlfriend) still at 33 in the evening, slowly declining over the night to 30. Since the maximum sweat free sleeping temperature under the best of conditions (good overhead fan and nude sleeping) is 29 as shown above, it was a sweaty night without aircon, only barely comfortable even at dawn. Looks like more punishment may be on the way, with the solar intensity not peaking for another 11 days.
The dawn air temperature in Bangkok according to Weather Underground was 29 degrees this morning, a high for this year. Dew point was only a little less, 26 degrees. Even though the (apparent, measured by radiation thermometer) dawn sky temperature was 12.5 degrees allowing for a slight suppression of the surface roof temperature to about 26.5 degrees, a couple of degrees below air temperature. Little of this carried through to the underside of the roof. The wee hours of the morning are a time when a roof minimum R-value would actually be a benefit, allowing more of the radiative heat loss to carry through to the rooms beneath. As it is, the room temperature even in this light house stubbornly remains about 2 degrees above the air temperature throughout the night. This is a two degrees that could make a difference in comfort.
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