Laserfiche WebLink
Section 3 2025 Urban Water Management Plan <br />Service Area Description City of Pleasanton <br /> Public Draft | May 2026 <br /> 3-3 EKI Environment & Water, Inc. <br />3.2 Climate <br /> <br />Pleasanton’s climate is characteristically Mediterranean, with hot, dry summers and cool, moist winters, <br />which is typical of the inland San Francisco Bay Area. This section discusses historical climate in City’s <br />water service area and potential effects of climate change. <br />Climate data was retrieved from the California Irrigation Management Information System’s (CIMIS) <br />Pleasanton Station (Station #191) for May 2004 through November 2025 (DWR, 2025). These data show <br />that most rainfall typically occurs between December and March (see Figure 3-2 and Table 3-1). On <br />average, Pleasanton receives 18 inches of rainfall annually and experiences 52 inches of annual reference <br />evapotranspiration (ETo). Maximum daily air temperature averages 86 degrees Fahrenheit (°F) in summer <br />months and 61°F in winter months. <br />Table 3-1 Climate Characteristics <br />Month Average Temperature Standard <br />Average ETo <br />(inches) <br />Average Rainfall <br />(inches) Min (°F) Max (°F) <br />January 38 60 1.5 3.0 <br />February 39 63 2.2 2.8 <br />March 42 66 3.6 3.0 <br />April 45 70 5.0 1.3 <br />May 49 75 6.3 0.6 <br />June 53 82 7.2 0.2 <br />July 56 88 7.7 0.1 <br />August 55 87 6.7 0.1 <br />September 53 85 5.0 0.2 <br />October 48 78 3.6 1.2 <br />November 41 67 2.0 1.6 <br />December 37 60 1.4 3.8 <br />Annual 46 73 52 18 <br />NOTES: <br />(a) ETo = reference evapotranspiration <br />(b) Climate data for May 2004-December 2025 from California Irrigation <br />Management Information System (CIMIS) Station #191. <br /> <br /> CWC §10631 <br />(a) Describe the service area of the supplier, … “climate…” <br /> CWC §10635 <br />(b)(4) Considerations of the historical drought hydrology, plausible changes on projected supplies and demands <br />under climate change conditions, anticipated regulatory changes, and other locally applicable criteria.