Official Vs. Actual Temperatures

saoodhashimOctober 14, 2013

I never knew the officially reported temperatures would be so different from the actual reading under direct sunlight. I bought an outdoor thermometer to measure the temps that my vegetable plants are facing. These days the highs as reported by the weather channels is 95F. Whereas my thermometer shows me 110F.

I came to know that the official temps are recorded under shade i.e. they are air temperatures....

Now this raises a question. When they say that the 85-86F is the temperatures beyond which a tomato will not fruit (or its productivity will be impaired), are we talking of the air temperature or the temperature that the plant is facing. With 6-8 hours under direct sunlight, the direct sunlight temperatures seem more relevant. Is it so. Or is it that when they speak of 86F for tomato they are actually speaking of the air temp. Can some expert clarify this?

Here is a link that might be useful: Why official temperatures are recorded in the shade?

Thank you for reporting this comment. Undo
ABlindHog(8a Tx Hill Country)

I am by no means an expert. I can not answer your question definitively but I did keep careful track of temperature and productivity this year. I kept my thermometer protected from the sun and wind, but I only used the one thermometer. I don't know what the corresponding âÂÂin direct sunlightâ temperatures were. I grew ten varieties seven of which are widely thought of as good heat setting types. The first variety to shut down quit setting fruit when the air temperature was regularly around 88 to 90 degrees, and all but one had shut down by the time the air temperature was regularly between 96 and 98 degrees. Juliet finally quit at about 99 degrees in the shade. Next year I plan to try Legend, a parthinocarpic variety that will set fruit without pollination to avoid heats' effect on pollen.


    Bookmark   October 14, 2013 at 2:18PM
Thank you for reporting this comment. Undo
dickiefickle(5B Dousman,Wi.)

All temperatures are given as air temps ..

    Bookmark   October 17, 2013 at 5:48AM
Sign Up to comment
More Discussions
Which tomato would you grow?
Out of the seeds I have, which would you grow two of?...
Anyone Growing Dwarf Tomatoes?
I recently acquired a copy of the excellent new book...
Ralph Whisnant
Is any one growing Delicious?
Is any one growing Delicious?
Better than a ziplock bag
Credit: Durgan from Brantford came up with the idea. Pop...
BriAnDaren Ottawa, On Zone 5
Brandy Boy Contest -2015
I propose a "Brandy Boy Contest" for 2015...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™