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0.931.24 <br />1.861.86 <br />0.931.860.62 <br />1.242.17 <br />0.931.551.24 <br />1.241.55 <br />1.241.551.86 <br />2.48 <br />1.401.68 <br />2.242.241.68 <br />2.241.40 <br />1.682.801.68 <br />2.241.96 <br />1.962.242.24 <br />2.522.80 <br />3.36 <br />2.483.103.72 <br />3.412.79 <br />3.412.483.41 <br />4.033.10 <br />3.103.413.10 <br />3.723.72 <br />4.034.655.27 <br />3.30 <br />3.904.80 <br />4.504.204.80 <br />3.904.80 <br />5.104.504.50 <br />5.104.80 <br />5.105.705.70 <br />6.006.90 <br />4.03 <br />4.655.275.27 <br />5.585.58 <br />5.276.205.89 <br />5.895.89 <br />6.826.516.82 <br />7.447.75 <br />8.068.68 <br />4.505.10 <br />5.705.70 <br />6.306.306.30 <br />6.906.60 <br />7.207.207.80 <br />7.807.80 <br />8.108.709.00 <br />9.60 <br />4.654.96 <br />5.585.896.51 <br />6.517.44 <br />7.447.448.06 <br />8.068.06 <br />8.998.688.68 <br />9.309.92 <br />9.61 <br />4.034.655.27 <br />5.585.89 <br />6.206.516.51 <br />6.827.13 <br />7.447.137.75 <br />7.757.75 <br />8.378.688.68 <br />3.30 <br />3.904.20 <br />4.504.504.80 <br />4.805.10 <br />5.705.105.70 <br />5.405.70 <br />5.705.706.30 <br />6.606.90 <br />2.48 <br />2.793.413.41 <br />3.103.72 <br />2.793.414.03 <br />3.103.72 <br />3.723.724.03 <br />4.034.34 <br />4.344.96 <br />1.201.80 <br />2.402.40 <br />1.502.401.20 <br />1.802.70 <br />1.502.101.80 <br />1.802.10 <br />2.102.402.70 <br />3.00 <br />0.621.24 <br />1.861.860.93 <br />1.860.62 <br />0.931.860.93 <br />1.550.93 <br />0.931.551.24 <br />1.551.86 <br />2.17 <br />32.939.046.3 <br />46.643.9 <br />49.743.349.4 <br />55.149.1 <br />53.153.454.3 <br />57.057.9 <br />62.566.571.6 <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 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 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 California, characterized by dense fog <br />COASTAL MIXED FOG AREA less fog and higher ETo than zone 1 <br />COASTAL VALLEYS & PLAINS & NORTH COAST MOUNTAINS more sunlight than zone 2 <br />SOUTH COAST INLAND PLAINS & MOUNTAINS NORTH OF SAN FRANCISCO more sunlight and higher sum-mer ETo than zone 3 <br />NORTHERN INLAND VALLEYS valleys north of San Franciaco <br />UPLAND CENTRAL COAST & LOS ANGELES BASIN higher elevation coastal areas <br />NORTHEASTERN PLAINS <br />INLAND SAN FRANCISCO BAY AREA inland area near <br />6DQ)UDQFLVFRZLWKVRPHPDULQHLQÀXHQFH <br />SOUTH COAST MARINE TO DESERT TRANSITION inland area between marine & desert climates <br />NORTH CENTRAL PLATEAU & CENTRAL COAST RANGE cool, high elevation areas with strong sum-mer sunlight; zone has limited climate data & the zones selection is somewhat subjective <br />CENTRAL SIERRA NEVADA mountain valleys east of <br />6DFUDPHQWRZLWKVRPHLQÀXHQFHIURPGHOWDEUHH]HLQsummer <br />EAST SIDE SACRAMENTO-SAN JOAQUIN VALLEY low winter & high summer ETo with slightly lower ETo than zone 14 <br />NORTHERN SIERRA NEVADA northern Sierra Nevada <br />PRXQWDLQYDOOH\VZLWKOHVVPDULQHLQÀXHQFHWKDQ]RQH11 <br />MID-CENTRAL VALLEY, SOUTHERN SIERRA NEVADA, TEHACHAPI & HIGH DESERT MOUNTAINS high sum-mer sunshine and wind in some locations <br />NORTHERN & SOUTHERN SAN JOAQUIN VALLEY slightly lower winter ETo due to fog and slightly higher summer ETo than zones 12 & 14 <br />WESTSIDE SAN JOAQUIN VALLEY & MOUNTAINS EAST & WEST OF IMPERIAL VALLEY <br />HIGH DESERT VALLEYS valleys in the high desert near Nevada and Arizona <br />IMPERIAL VALLEY, DEATH VALLEY & PALO VERDE low desert areas with high sunlight & considerable 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 />____________________________________________________________________________________