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0.93 <br />1.24 <br />1.86 <br />1.86 <br />0.93 <br />1.86 <br />0.62 <br />1.24 <br />2.17 <br />0.93 <br />1.55 <br />1.24 <br />1.24 <br />1.55 <br />1.24 <br />1.55 <br />1.86 <br />2.48 <br />1.40 <br />1.68 <br />2.24 <br />2.24 <br />1.68 <br />2.24 <br />1.40 <br />1.68 <br />2.80 <br />1.68 <br />2.24 <br />1.96 <br />1.96 <br />2.24 <br />2.24 <br />2.52 <br />2.80 <br />3.36 <br />2.48 <br />3.10 <br />3.72 <br />3.41 <br />2.79 <br />3.41 <br />2.48 <br />3.41 <br />4.03 <br />3.10 <br />3.10 <br />3.41 <br />3.10 <br />3.72 <br />3.72 <br />4.03 <br />4.65 <br />5.27 <br />3.30 <br />3.90 <br />4.80 <br />4.50 <br />4.20 <br />4.80 <br />3.90 <br />4.80 <br />5.10 <br />4.50 <br />4.50 <br />5.10 <br />4.80 <br />5.10 <br />5.70 <br />5.70 <br />6.00 <br />6.90 <br />4.03 <br />4.65 <br />5.27 <br />5.27 <br />5.58 <br />5.58 <br />5.27 <br />6.20 <br />5.89 <br />5.89 <br />5.89 <br />6.82 <br />6.51 <br />6.82 <br />7.44 <br />7.75 <br />8.06 <br />8.68 <br />4.50 <br />5.10 <br />5.70 <br />5.70 <br />6.30 <br />6.30 <br />6.30 <br />6.90 <br />6.60 <br />7.20 <br />7.20 <br />7.80 <br />7.80 <br />7.80 <br />8.10 <br />8.70 <br />9.00 <br />9.60 <br />4.65 <br />4.96 <br />5.58 <br />5.89 <br />6.51 <br />6.51 <br />7.44 <br />7.44 <br />7.44 <br />8.06 <br />8.06 <br />8.06 <br />8.99 <br />8.68 <br />8.68 <br />9.30 <br />9.92 <br />9.61 <br />4.03 <br />4.65 <br />5.27 <br />5.58 <br />5.89 <br />6.20 <br />6.51 <br />6.51 <br />6.82 <br />7.13 <br />7.44 <br />7.13 <br />7.75 <br />7.75 <br />7.75 <br />8.37 <br />8.68 <br />8.68 <br />3.30 <br />3.90 <br />4.20 <br />4.50 <br />4.50 <br />4.80 <br />4.80 <br />5.10 <br />5.70 <br />5.10 <br />5.70 <br />5.40 <br />5.70 <br />5.70 <br />5.70 <br />6.30 <br />6.60 <br />6.90 <br />2.48 <br />2.79 <br />3.41 <br />3.41 <br />3.10 <br />3.72 <br />2.79 <br />3.41 <br />4.03 <br />3.10 <br />3.72 <br />3.72 <br />3.72 <br />4.03 <br />4.03 <br />4.34 <br />4.34 <br />4.96 <br />1.20 <br />1.80 <br />2.40 <br />2.40 <br />1.50 <br />2.40 <br />1.20 <br />1.80 <br />2.70 <br />1.50 <br />2.10 <br />1.80 <br />1.80 <br />2.10 <br />2.10 <br />2.40 <br />2.70 <br />3.00 <br />0.62 <br />1.24 <br />1.86 <br />1.86 <br />0.93 <br />1.86 <br />0.62 <br />0.93 <br />1.86 <br />0.93 <br />1.55 <br />0.93 <br />0.93 <br />1.55 <br />1.24 <br />1.55 <br />1.86 <br />2.17 <br />32.9 <br />39.0 <br />46.3 <br />46.6 <br />43.9 <br />49.7 <br />43.3 <br />49.4 <br />55.1 <br />49.1 <br />53.1 <br />53.4 <br />54.3 <br />57.0 <br />57.9 <br />62.5 <br />66.5 <br />71.6 <br />Monthly Average Reference Evapotranspiration by ETo Zone (inches/month) <br />Variability between stations within single zones is as high as 0.02 inches per day for zone 1 and during winter months in zone 13. The <br />average standard deviation of the ETo between estimation sites wihtin a zone for all months is about 0.01 inches per day for the 200 sites <br />used to develop the map. <br /> Zone Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total <br />Reference EvapoTranspiration (ETo) Zones <br />COASTAL PLAINS HEAVY FOG BELT lowest ETo in <br />California, characterized by dense fog <br />COASTAL MIXED FOGAREA less fog and higher ETo <br />than zone 1 <br />COASTAL VALLEYS & PLAINS & NORTH COASTMOUNTAINS more sunlight than zone 2 <br />SOUTH COAST INLAND PLAINS & MOUNTAINS NORTHOF SAN FRANCISCO more sunlight and higher sum- <br />mer ETo than zone 3 <br />NORTHERN INLAND VALLEYS valleys north of San <br />Franciaco <br />UPLAND CENTRAL COAST & LOSANGELES BASIN <br />higher elevation coastal areas <br />NORTHEASTERN PLAINS <br />INLAND SAN FRANCISCO BAYAREA inland area near <br />6DQ)UDQFLVFRZLWKVRPHPDULQHLQÀXHQFH <br />SOUTH COAST MARINE TO DESERT TRANSITION <br />inland area between marine & desert climates <br />NORTH CENTRAL PLATEAU & CENTRAL COASTRANGE cool, high elevation areas with strong sum- <br />mer sunlight; zone has limited climate data & the <br />zones selection is somewhat subjective <br />CENTRAL SIERRANEVADA mountain valleys east of <br />6DFUDPHQWRZLWKVRPHLQÀXHQFHIURPGHOWDEUHH]HLQ <br />summer <br />EAST SIDE SACRAMENTO-SAN JOAQUIN VALLEY <br />low winter & high summer ETo with slightly lower ETo <br />than zone 14 <br />NORTHERN SIERRANEVADA northern Sierra Nevada <br />PRXQWDLQYDOOH\VZLWKOHVVPDULQHLQÀXHQFHWKDQ]RQH <br />11 <br />MID-CENTRAL VALLEY, SOUTHERN SIERRANEVADA,TEHACHAPI & HIGH DESERT MOUNTAINS high sum- <br />mer sunshine and wind in some locations <br />NORTHERN & SOUTHERN SAN JOAQUIN VALLEY <br />slightly lower winter ETo due to fog and slightly higher <br />summer ETo than zones 12 & 14 <br />WESTSIDE SAN JOAQUIN VALLEY & MOUNTAINSEAST & WEST OF IMPERIAL VALLEY <br />HIGH DESERT VALLEYS valleys in the high desert <br />near Nevada and Arizona <br />IMPERIAL VALLEY, DEATH VALLEY & PALO VERDE <br />low desert areas with high sunlight & considerable <br />heat advection <br />1 <br />2 <br />4 <br />3 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />_________________________ __________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________ <br />____________________________________________________________________________________