[permaculture] upland Mediterranean climate

Dieter Brand diebrand at yahoo.com
Tue Dec 8 14:23:41 EST 2009

We are at the bottom of a small valley at 250 meters above sea level; the top of our property is at 400 meters.  I don’t have the average temps, but from my own measurements: we get about 2 weeks with max. temps of around 100 F. With a clear sky (which is almost always during the summer) the temps drop to 60 to 70 F at night.  The max. temps didn’t increase this year, but we already reached 85 F in March and still sometimes had 85 F in October.  During the winter, we get about 2 weeks with light night frost with 25 to 30 F when the sky is clear between mid Nov. and mid Feb. With cloudy sky, the temps usually don’t drop below 50 F at night.  Daytime temps in the winter are between 60 to 70 F.  We are about 10 miles inland from the Ocean.  People closer to the Ocean or who don’t live in a valley normally don’t get any frost at all.  In our valley, we had one year without frost in the last 10 years.  This year is warmer than usual and it
 still doesn’t look like night frost.  We lost some of our citrus trees during a particularly cold year when the temps dropped to about 12 F for one or two nights.
I suspected that *waterline* wasn´t the correct English word, but didn’t have the time for checking, and still don’t (sorry).  It is the lowest line at the bottom of a valley where water may run for several days after strong rains.  It is the place with the most humidity where underground water may flow even if no more water is visible at the surface.  We have one main valley and three little side valleys.

--- On Mon, 12/7/09, Rain Tenaqiya <raincascadia at yahoo.com> wrote:

From: Rain Tenaqiya <raincascadia at yahoo.com>
Subject: [permaculture] upland Mediterranean climate
To: permaculture at lists.ibiblio.org
Date: Monday, December 7, 2009, 6:34 PM

What is your elevation and temperature regime?  We are at 1160 ft (350 meters).  It usually gets down to around 22 F (-5 C) during the Winter, though it has probably gone down to 12 F (-11 C).  We get these Spring frosts that are unusually cold which are also unusually colder than the main valley below us for some reason that often destroy our stone fruit crops and things like potatoes.  In the Summer, we usually have around 14 days of temperatures over 100 F (38 C), typically getting to around 110 F (44 C).  Our average high is supposed to be 92 F (34 C), but I think it's been hotter since we moved here five years ago.  The Summer nights usually get into the 50s (10s in C), as we are 30 miles from the ocean which is epicenter of upwelling and the coldest ocean temperatures on the US West Coast.  This makes it hard for many fruits to ripen properly.  Kind of a weird climate, eh?
By the way, what is a waterline?  At our place, only the hardiest trees can survive the strategy you use.  I don't think I could get any fruit from unirrigated trees, except maybe for olives in the shade.  I still need to experiment with pushing the limits on drought tolerance, but for the price of most trees, it makes much more sense to give them all the love and care that they need to thrive.

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