Editing Sierra Madre, California (section)

==Geography and climate==
According to the [[United States Census Bureau]], the town has a total area of 3.0 square miles ({{convert|7.7|km2|sqmi|abbr=on}} (7.7&nbsp;km<sup>2</sup>) of it is land, and 0.15% is water.

Sierra Madre has warm, dry summers, and cool, wet winters (Mediterranean climate type). Annual precipitation is just about 24 inches, mostly falling between November and March. In fall months, a Southern California phenomenon called the Santa Ana winds can bring daytime temperatures into the 80s year round, and keep overnight lows above 60, even in winter. Winter, however, mostly consist of cool, rainy days followed by warm sunny ones. Frosts are not very common, with snow only being recorded 3 times. By May, Pacific storms no longer visit the region. In May and June, hot desert temperatures combined with cool ocean waters bring in low hanging clouds each morning called the Marine Layer. They dissipate by noon. These clouds make June the cloudiest month for Sierra Madre, even though it only receives an average 0.20" of rain in June. From July through October, hot temperatures grip the region, with September being the hottest month, unlike the rest of the nation. During this period, it rarely rains.
{{Weather box|location = Sierra Madre, California (1897-1958 averages)
|single line = Y
|Jan record high F =  93
|Feb record high F =  92
|Mar record high F =  98
|Apr record high F = 105
|May record high F = 104
|Jun record high F = 113
|Jul record high F = 118
|Aug record high F = 117
|Sep record high F = 111
|Oct record high F = 108
|Nov record high F = 101
|Dec record high F =  93
|year record high F = 118
|Jan high F = 63.8
|Feb high F = 65.2
|Mar high F = 67.5
|Apr high F = 71.1
|May high F = 74.1
|Jun high F = 80.4
|Jul high F = 88.2
|Aug high F = 88.5
|Sep high F = 86.0
|Oct high F = 78.7
|Nov high F = 73.2
|Dec high F = 66.4
|year high F = 
|Jan low F = 45.1
|Feb low F = 45.6
|Mar low F = 46.7
|Apr low F = 48.9
|May low F = 51.3
|Jun low F = 54.5
|Jul low F = 59.1
|Aug low F = 59.8
|Sep low F = 58.7
|Oct low F = 55.0
|Nov low F = 51.6
|Dec low F = 47.2
|year low F = 52.5
|Jan record low F = 21
|Feb record low F = 26
|Mar record low F = 29
|Apr record low F = 31
|May record low F = 32
|Jun record low F = 41
|Jul record low F = 45
|Aug record low F = 43
|Sep record low F = 41
|Oct record low F = 36
|Nov record low F = 26
|Dec record low F = 25
|year record low F = 21
|rain colour = green
|Jan rain inch = 4.93
|Feb rain inch = 4.68
|Mar rain inch = 4.17
|Apr rain inch = 2.11
|May rain inch = 0.85
|Jun rain inch = 0.20
|Jul rain inch = 0.03
|Aug rain inch = 0.06
|Sep rain inch = 0.38
|Oct rain inch = 1.06
|Nov rain inch = 1.77
|Dec rain inch = 3.79
|Jan snow inch = 0.4
|Feb snow inch = 0.0
|Mar snow inch = 0.0
|Apr snow inch = 0.0
|May snow inch = 0.0
|Jun snow inch = 0.0
|Jul snow inch = 0.0
|Aug snow inch = 0.0
|Sep snow inch = 0.0
|Oct snow inch = 0.0
|Nov snow inch = 0.0
|Dec snow inch = 0.0
|year snow inch = 0.4
|source 1 = <ref>{{cite web
|url=https://wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca8210 |title=Sierra Madre Henszey, California |access-date=March 21, 2022 |publisher=WRCC}}</ref>
}}

The [[1991 Sierra Madre earthquake]] was a [[Moment magnitude scale|M]] 5.8 tremor that hit at {{tooltip|07:43:55 local time|14:43:55 UTC}} on June 28, 1991. It caused regional damage, such as knocking over chimneys and fragmenting cinder block walls that run along major roads in the area.

Sierra Madre lies between Santa Anita Blvd. to the east and [[Michillinda Avenue|Michillinda Ave.]] to the west. To the south, it is bordered by [[Orange Grove Boulevard (Pasadena)|Orange Grove Blvd.]] Its principal road is [[Sierra Madre Boulevard|Sierra Madre Blvd.]]