right now the weather has been hella hot around my area. im growin hashberry's. the temps in my room are from 92-102f, but the HBs seems to be doing good with no stress
Wow that's hot my friend! Are you sure you are measuring properly? Although some strains will adapt to the heat better. But anyways...
Essentially there are two aspects to the thermal environment that you need to be aware of:
1. The AIR temperature
2. The RADIANT temperature
Although obviously related, these are 2 distinctly separate phenomena and your plants have different tolerances for each.
1. Air temperature
Your standard mercury/alcohol-bulb or digital thermometer is designed to measure the temperature of the air (But not radiant heat). This is what is being referred to in the usual growers 'rules of thumb' such as maintaining your grow above 16degC and below 30degC.
Most thermometers are only designed to measure air temperature – growers often mistakenly place their thermometer in direct light; radiant energy will warm your thermometer and give a higher than actual reading.
*Assuming your air is well mixed up by oscillating fans, it doesn’t really matter where you locate your thermometer. The best spot is probably about half the way up a wall, with a piece of cardboard over it (To shade it from radiant heat), exposed to the mixed air in the grow room.
2. Radiant temperature
Radiant temperature is the result of heat transfer bewteen objects at different temperatures without whats inbetween i.e. the air, being effected. In our case the plants are naturally at a lower temperature that the light and reflector so heat is transferred to the plants foliage from the light/refecltor through radiation. This causes the leaves to heat up. The plants can withstand much higher radiant temperatures (around 40-50degC) than they can air temperatures but if this is too high the plants can 'burn'.