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1995-07-26
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SUNSHINE GUIDE TO LISBON, PORTUGAL
SEASONS: Lisbon has a three-season year. Spring (mid-March through mid-May)
is a season of blossoming and burgeoning forth, as the rains slowly taper off.
Summer (mid-May through the first heavy rains of October) is dry and sunny.
Winter (from the first heavy rains in October through the middle of March) is
the season of rain and short days. Since most of the trees are evergreen
(including the oaks, citrus, and olives), there is no "fall".
____________________________________________________________________________________________________________
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
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HOURS OF DAYLIGHT 9:48 10:44 11:56 13:12 14:16 14:50 14:36 13:41 12:29 11:14 10:07 9:32
HOURS OF SUNSHINE 5:00 5:55 6:31 8:24 9:20 10:31 11:40 11:19 8:56 6:54 5:18 4:42
AREA OF BLUE SKY 41% 42% 42% 44% 49% 58% 77% 75% 61% 49% 41% 40%
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LOW FOR MONTH 37° 39° 42° 46° 49° 54° 58° 59° 57° 50° 43° 38°
SUNRISE TEMPERATURE 46° 47° 49° 52° 56° 60° 63° 64° 62° 57° 52° 47°
AFTERNOON TEMPERATURE 56° 58° 62° 65° 69° 76° 80° 81° 77° 70° 62° 57°
HIGH FOR MONTH 62° 65° 71° 76° 83° 91° 94° 94° 90° 81° 70° 64°
____________________________________________________________________________________________________________
FROSTY MORNINGS 1% 1% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
AFTERNOONS OVER 90° 0% 0% 0% 0% 2% 8% 21% 18% 13% 0% 0% 0%
AFTERNOON HUMIDITY 72% 65% 64% 57% 57% 54% 48% 48% 54% 59% 68% 72%
SEA TEMPERATURES 57° 56° 57° 58° 60° 62° 64° 65° 65° 64° 61° 59°
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REASONABLY DRY DAYS 76% 76% 77% 79% 85% 93% 99% 98% 90% 82% 76% 76%
TOTAL PRECIPITATION 3.6" 3.3" 3.3" 2.4" 1.7" 0.7" 0.2" 0.2" 1.3" 3.0" 4.1" 3.8"
SNOWY DAYS 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
THUNDER DAYS 2% 3% 3% 4% 3% 2% 1% 1% 3% 3% 3% 3%
FOGGY DAYS 11% 8% 4% 1% 1% 1% 1% 1% 2% 3% 8% 12%
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NICE DAY INDEX 72% 74% 75% 79% 83% 89% 94% 94% 88% 80% 74% 71%
____________________________________________________________________________________________________________
Copyright 1995 by Patrick J. Tyson, Box 492787, Redding CA 96049. All rights reserved.
____________________________________________________________________________________________________________
SUNSHINE GUIDE TO LISBON, PORTUGAL
SUNNIEST MONTHS: Except for December (and that just barely misses), every
month in the year gets half or more of the available sunshine. July and
August, however, will get the most. In general, 65% of the year's daylight
hours will be sunny--from a high of 83% in August, to a "low" of 49% in
December. July and August will also get the most clear weather--about two
days out of three.
WARMEST MONTHS: Mid-June through late September. Warm to hot days with mild
nights characterizes Lisbon's summer. Most of the time, the winds off the
North Atlantic Ocean keep Lisbon's temperatures from getting as hot as they
otherwise might. However, when the winds fail the temperature climbs, and
spells of 90° and hotter weather will set in. The hottest temperature of the
year will be around 98°, and will probably occur in either July or August.
From June through early October, most nights will be hot enough that you
will sleep better with some sort of room-cooling.
COOLEST MONTHS: The December through early March season is chilly and raw,
but not really very cold. This time, the winds off the ocean keep things from
getting as cold as places farther inland. Frosty mornings will occur, but
only about every third year or so. The coldest temperature of the year will
be around 33°, and will probably occur in January. Snow flurries are rare,
but not unknown.
Crops continue to grow during the winter months, especially grains and
some vegetables. The grain harvest is usually in the late spring or early
summer.
DRIEST MONTHS: Every month get rain on less than half of its days, but July
and August are the driest by far. Some 69% of the year's days will get no
measurable precipitation; that is, they will get less than a hundredth of an
inch. July and August will have 93% such days, whereas January will get only
53%. A "dry day" in the table, however, is one with less than a tenth of an
inch--a more useful measure. It takes at least that much to wet the ground
under the trees.
THINGS TO KNOW: Despite its location on the Atlantic Coast of Portugal,
Lisbon shows a typical "Mediterranean" climatic pattern, with its winter rain
and summer drought. In this, it is more "Mediterranean" than northern Italy,
which lies on that sea.
Lisbon will often have a distinct "urban heat island" effect. Under
windless and rainless conditions (or near), the city center will be many
degrees warmer than the outlying suburbs. This is especially noticeable at
night and in the winter. Precipitation of any kind diminishes this effect,
and a strong wind will eliminate it completely. The table data are for the
city center, not the suburbs--but the difference is not great in this case.
____________________________________________________________________________________________________________
Copyright 1995 by Patrick J. Tyson, Box 492787, Redding CA 96049. All rights reserved.
____________________________________________________________________________________________________________