Espresso Potential (#)

  „Environmental Factors - The humidity and temperature will change throughout the day.  Since coffee is hydroscopic (absorbs moisture), the grind size must be changed throughout the day to achieve a brew time of 25-30 seconds.  The temperature will not affect the espresso like the humidity, but it is important to avoid exposing the coffee to any high temperatures until brewing.“

http://www.coffeeresearch.org/espresso/ potential.htm - Cached

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Some slightly related:

Coffee: Resources for home espresso

  „Coffee should be stored in glass airtight containers in a cool, dark place, andprotected from sharp swings in humidity and temperature. The fridge and freezerare out! Freezing gives one the satisfaction of having done something decisive, at thecoffee's expense.“

http://www.math.columbia.edu/~bayer/coffee.html - Cached

Pulling the Perfect Shot of Espresso (INeedCoffee.com)

  „Other factors that make the difference are heat, humidity, and where your coffee is stored. Now, I'm not trying to bore you, but these items can be important if you are trying to achieve consistently perfect shots of espresso. Pulling The Shot Once you know what machine you have and the coffee is ground, it is time to pull shots.“

http://www.ineedcoffee.com/99/05/perfectshot/ - Cached

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