Editing Palo Alto, California (section)

===Climate===
Typical of the South Peninsula region of the San Francisco Bay Area, Palo Alto has a [[Mediterranean climate]] with mild, moderately wet winters and warm, dry summers. Typically, in the warmer months, as the sun goes down, the fog bank flows over the foothills to the west and covers the night sky, thus creating a blanket that helps trap the summer warmth absorbed during the day.{{citation needed|date=March 2024}} Even so, it is rare for the overnight low temperature to exceed {{convert|60|°F|°C|abbr=on}}.{{citation needed|date=March 2024}}

In January, average daily temperatures range from a low of {{convert|39.0|°F|°C|abbr=on}} to a high of {{convert|57.8|°F|°C|abbr=on}}. In July, average temperatures range from {{convert|55.7|to|79.4|°F|°C|abbr=on}}. The record high temperature was {{convert|108|°F|°C|abbr=on}} on September 6, 2022, and the record low temperature was {{convert|20|°F|°C|abbr=on}} on January 11, 1949, and December 24, 1990. Temperatures reach {{convert|90|°F|0|abbr=on}} or higher on an average of 12.0 days. Temperatures drop to {{convert|32|°F|0|abbr=on}} or lower on an average of 14.0 days.

Due to the [[Santa Cruz Mountains]] to the west, there is a "[[rain shadow]]" in Palo Alto, resulting in an average annual rainfall of only {{convert|15.12|in|mm}}. Measurable rainfall occurs on an average of 55.8 days annually. The wettest year on record was 1983 with {{convert|32.51|in|mm}} and the driest year was 2013 with {{convert|3.81|in|mm}}. The most rainfall in one month was {{convert|12.43|in|mm}} in February 1998 and the most rainfall in one day was {{convert|3.75|in|mm}} on February 3, 1998. Measurable snowfall is very rare in the populated areas of Palo Alto, but {{convert|1.5|in|cm}} fell on January 21, 1962.<ref>{{cite web|url=http://www.wrcc.dri.edu/summary/Climsmcca.html|title=Central California|website=Dri.edu}}</ref> A dusting of snow occasionally occurs in the highest (unpopulated) section of Palo Alto near Skyline Ridge, where the elevation reaches up to {{convert|2,812|ft|m}}.<ref name="snow">{{cite news |title=Snow-capped Palo Alto |url=https://www.paloaltoonline.com/news/2008/12/16/snow-capped-palo-alto |access-date=June 19, 2018 |work=Palo Alto Online |date=December 15, 2008 |language=en}}</ref>

According to the [[Köppen Climate Classification]] system, Palo Alto has a warm-summer Mediterranean climate (Csb).<ref>{{cite web|url=http://www.weatherbase.com/weather/weather-summary.php3?s=646640&cityname=Palo+Alto,+California,+United+States+of+America&units=|title=Palo Alto, California Köppen Climate Classification (Weatherbase)|website=Weatherbase.com}}</ref>

{{Weather box
|location = Palo Alto, California, 1991–2020 normals, extremes 1922–present
|single line = Yes

|Jan record high F = 75
|Feb record high F = 84
|Mar record high F = 85
|Apr record high F = 98
|May record high F = 100
|Jun record high F = 107
|Jul record high F = 105
|Aug record high F = 101
|Sep record high F = 108
|Oct record high F = 100
|Nov record high F = 89
|Dec record high F = 75

|Jan avg record high F = 66.2
|Feb avg record high F = 70.9
|Mar avg record high F = 75.9
|Apr avg record high F = 84.2
|May avg record high F = 88.6
|Jun avg record high F = 93.6
|Jul avg record high F = 93.3
|Aug avg record high F = 92.4
|Sep avg record high F = 91.5
|Oct avg record high F = 86.9
|Nov avg record high F = 74.4
|Dec avg record high F = 65.8
|year avg record high F = 97.9

|Jan high F = 57.8
|Feb high F = 60.7
|Mar high F = 65.5
|Apr high F = 69.6
|May high F = 73.3
|Jun high F = 78.5
|Jul high F = 79.4
|Aug high F = 78.7
|Sep high F = 79.6
|Oct high F = 74.0
|Nov high F = 63.7
|Dec high F = 57.6
|year high F =

|Jan mean F = 48.4
|Feb mean F = 51.0
|Mar mean F = 54.6
|Apr mean F = 57.4
|May mean F = 61.4
|Jun mean F = 65.6
|Jul mean F = 67.6
|Aug mean F = 67.0
|Sep mean F = 66.3
|Oct mean F = 61.2
|Nov mean F = 53.1
|Dec mean F = 48.1
|year mean F =

|Jan low F = 39.0
|Feb low F = 41.3
|Mar low F = 43.6
|Apr low F = 45.3
|May low F = 49.5
|Jun low F = 52.7
|Jul low F = 55.7
|Aug low F = 55.3
|Sep low F = 53.0
|Oct low F = 48.4
|Nov low F = 42.5
|Dec low F = 38.6
|year low F =

|Jan avg record low F = 30.6
|Feb avg record low F = 32.5
|Mar avg record low F = 35.1
|Apr avg record low F = 38.0
|May avg record low F = 41.6
|Jun avg record low F = 46.1
|Jul avg record low F = 48.6
|Aug avg record low F = 49.7
|Sep avg record low F = 46.1
|Oct avg record low F = 40.4
|Nov avg record low F = 33.5
|Dec avg record low F = 29.7
|year avg record low F = 28.1

|Jan record low F = 20
|Feb record low F = 20
|Mar record low F = 22
|Apr record low F = 31
|May record low F = 33
|Jun record low F = 40
|Jul record low F = 40
|Aug record low F = 44
|Sep record low F = 37
|Oct record low F = 32
|Nov record low F = 26
|Dec record low F = 20

|precipitation colour = green
|Jan precipitation inch = 2.95
|Feb precipitation inch = 3.18
|Mar precipitation inch = 2.19
|Apr precipitation inch = 0.97
|May precipitation inch = 0.44
|Jun precipitation inch = 0.10
|Jul precipitation inch = 0.00
|Aug precipitation inch = 0.03
|Sep precipitation inch = 0.07
|Oct precipitation inch = 0.64
|Nov precipitation inch = 1.60
|Dec precipitation inch = 2.95
|year precipitation inch =

|unit precipitation days = 0.01 in
|Jan precipitation days = 10.0
|Feb precipitation days = 10.1
|Mar precipitation days = 8.2
|Apr precipitation days = 5.2
|May precipitation days = 2.5
|Jun precipitation days = 0.7
|Jul precipitation days = 0.0
|Aug precipitation days = 0.2
|Sep precipitation days = 0.5
|Oct precipitation days = 2.5
|Nov precipitation days = 6.2
|Dec precipitation days = 9.7

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|unit snow days = 0.1 in
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|source 1 = NOAA<ref name = NOAA>
{{cite web
|url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USC00046646&format=pdf&dataTypes=MLY-TMAX-NORMAL,MLY-TMIN-NORMAL,MLY-TAVG-NORMAL,MLY-PRCP-NORMAL,MLY-SNOW-NORMAL
|publisher = National Oceanic and Atmospheric Administration
|title = U.S. Climate Normals Quick Access – Station: Palo Alto, CA
|access-date = February 18, 2023
}}
</ref>
|source 2 = XMACIS2 (mean maxima/minima 1981–2010)<ref name = XMACIS2>
{{cite web
|url = https://xmacis.rcc-acis.org/
|publisher = National Oceanic and Atmospheric Administration
|title = xmACIS2
|access-date = February 18, 2023
}}
</ref>
}}