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Yearly Normals for Castro Valley, CA

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 44 56 50 5.13 466 0 Feb 46 59 53 4.75 344 0 Mar 47 61 54 4.08 337 0 Apr 49 64 56 1.63 263 1 May 51 67 59 0.61 198 11 Jun 54 70 62 0.14 123 18 Jul 55 70 63 0.07 85 22 Aug 56 71 63 0.1 80 23 Sep 56 72 64 0.36 82 46 Oct 54 70 62 1.37 119 18 Nov 48 62 55 3.62 300 3 Dec 44 57 50 3.54 460 0 Year 50 65 58 25.4 2857 142 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather