Why does my room feel cooler on sunny days but warmer on rainy days?

2

1

4

Blinds half closed, morning sun, fan turned to 3 gears, one window slightly open, door closed

Blinds half closed, door open, hardly any wind at corridor

2. Inconsistent wind blow hardly cool the space. Comparing 1-1 or 2-2, with door closed and open respectively, we could see that opening the door does not necessarily lower the temperature of the interior, especially when the corridor is

3. As wind speed increases, relative humidity tends to decrease.

Blinds half closed, afternoon sun, fan turned to 3 gears, one window slightly open, door closed Blinds half closed, afternoon sun covered by clouds occasionally, fan turned to 3 gears, door open

My room feels cooler than the corridor on sunny days could also because of the higher humidity level inside the room.

60.5 neutral Blinds half closed, door open, gentle breeze at corridor (0.8m/s)

460.2 neutral Blinds half closed, no direct sunshine, air is quite still, fan turned to 3 gears, one window slightly open, door closed 1

515.7 can feel a bit of the cross ventilation Blinds half closed, door open

It also suggests that when it is not windy, cross-ventilation is unlikely to occur.

1494 neutral Blinds half closed, door closed 2 neutral Blinds half closed, door closed neutral Blinds half closed, door open 3 gentle breeze Blinds half closed, door open, gentle breeze at corridor (1.3m/s) 1 cool Blinds half closed, fan turned to 3 gears, one window slightly open, door closed

Similarly, on rainy days when the humidity level is very high, it feels colder than the actual temperature. Although the temperature is still above 27°C, it feels like 24°C. Since my room is less humid than the exterior, it feels warmer.

However, on overcast days when the exterior, meaning the corridor or outside the window is much cooler (about 2°C) than the interior, 1 and 2 which are in the middle of the room are warmer than 3 and 4.

100.5 cool Blinds half closed, door open 2

Since my room is not deep inside the corridor, cross-ventilation can be felt on rainy and windy days when the corridor has a relatively strong wind blowing from one consistent direction.

Is my room brighter and warmer than the corridor?

Annual average luminance of accessible corridor at eye level (1200 mm): 1048 lux

Annual average luminance of my room at work surface level (750 mm): 1165 lux

My room with blind fully open

My room is generally bright with blinds fully open (on sunny days), but the sun glare is largely imperceptible. Yet, I have the habit of leaving my blind half open to achieve a comfortable brightness level for working and resting (around 300 lux).

How come recently my room is significantly hotter in the afternoon?

In the afternoon, due to the orientation of the building and the lower sun angle, sunlight is converged to a point between the desk and the bed that is super hot.