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Old 12-30-2010, 10:22 PM
 
3,142 posts, read 5,673,471 times
Reputation: 1725
Have my thermometers totally flipped out? I've got the front yard one (its sitting up on the block fence) reading 27.0 degrees and the digital one in the back (on a table out in the open) reading 27.9 degrees. The non-digital one under the patio cover is at 32 degrees.

Does the patio cover make that big of a difference? I would have never guessed.
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Old 12-30-2010, 10:25 PM
 
Location: Sonoran Desert
15,860 posts, read 18,628,631 times
Reputation: 8214
I've got a balmy 39.8 right now (2024).
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Old 12-30-2010, 10:28 PM
 
Location: Tempe, AZ
372 posts, read 700,975 times
Reputation: 192
Thumbs up Urban heat island causes temperatures to be higher in the middle of the city

Quote:
Originally Posted by khuntrevor View Post
It's the low for the 24 hours. Friday's lows will come tomorrow morning. I think either it's being exagerated or it is much warmer Downtown.
It is warmer in downtown Phoenix, due to the urban heat island effect. The dense concentration of buildings and lots of concrete and asphalt replacing dirt and vegetation traps in more heat, resulting in warmer temperatures in the middle of the city than in low-density suburban and rural areas.
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Old 12-30-2010, 10:31 PM
 
3,142 posts, read 5,673,471 times
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Uhh...what's the explanation here? I'm refusing to believe that it's this cold out this early (10:30 PM) but I've got two digital thermometers saying the same thing. I thought maybe it was the wind chill since they are out in the open but it isn't windy at all outside.

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Old 12-30-2010, 10:48 PM
 
Location: Phoenix, AZ
3,010 posts, read 2,435,373 times
Reputation: 2836
Holy guacamole! I left the midwest to escape this crap!
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Old 12-30-2010, 10:55 PM
 
Location: Tempe, AZ
372 posts, read 700,975 times
Reputation: 192
Quote:
Originally Posted by HX_Guy View Post
Have my thermometers totally flipped out? I've got the front yard one (its sitting up on the block fence) reading 27.0 degrees and the digital one in the back (on a table out in the open) reading 27.9 degrees. The non-digital one under the patio cover is at 32 degrees.

Does the patio cover make that big of a difference? I would have never guessed.
It probably does, as more there is more heat trapped into this area due to the lower circulation of cooler air. The other thermometers are out in the open so there is a lot of cool air circulating around them. The thermometer under the patio cover is closer to the house so it is being affected by heat radiating from the house.

For accurate measurements, thermometers, barometers, and other meteorological instruments should be shielded in a Stevenson screen, a wooden, louvered, wooden box, painted white and situated about five feet above ground. This box keeps the instruments above ground at a height where they can be easily read by a standing observer, and the construction of the box protects the instruments from precipitation and direct sunlight while allowing air to circulate. The shelter should not be placed too close to buildings or trees to minimize their effects, and the door should be placed on the north side to prevent direct sunlight on the thermometers.

Here is a picture of a Stevenson screen. This Stevenson screen is more than six feet above ground, but due to the snowy climate in this Alpine environment a higher positioning of the box is necessary.
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Old 12-30-2010, 10:59 PM
 
Location: Phoenix
115 posts, read 130,064 times
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I'm in the 85008 area and it is currently 36.6 @ 2300hrs.
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Old 12-30-2010, 11:01 PM
 
537 posts, read 596,462 times
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11:00 PM 36.3 degrees 19th. Ave. and Osborn
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Old 12-30-2010, 11:49 PM
 
3,142 posts, read 5,673,471 times
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Showing 24.8 degrees now at 11:49 PM.
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Old 12-30-2010, 11:50 PM
 
2,879 posts, read 3,737,900 times
Reputation: 1082
32.3 here near VA Hospital at 23:50
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