When temperatures rise for a few weeks, trees can start to bud. If that happens and then the cold returns, the young buds can die. If that happens, you can lose your crop. That happened to me a couple years ago. Apple yields were less than 10% of normal.
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global temperature caNNot be measured, only modeled.
'That' is the real world friends.
indeed, we'll leave your observations about glacier growth for another moment
what you meant about temperature is that any temperature measurement in fact reduces to a model
all temperature measurements can not directly measure the 'true' temperature of a system
the only difference is that with earth's system you have a much larger mass than most measurements
measurement of a swimming pool for example will have uncertainties
don't try squirming out of it with semantics.
the earth is large...too large to measure.
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