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Reference EvapoTranspiration (ETo) Zones 1❑ COASTAL PLAINS HEAVY FOG BELT lowest ETo in 11 CENTRAL SIERRA NEVADA mountain valleys east of California, characterized by dense fog Sacramento with some influence from delta breeze in summer ❑2 COASTAL MIXED FOG AREA less fog and higher ETo than zone 1 12 EAST SIDE SACRAMENTO-SAN JOAQUIN VALLEY low winter& high summer ETo with slightly lower ETo COASTAL VALLEYS&PLAINS&NORTH COAST than zone 14 MOUNTAINS more sunlight than zone 2 13 NORTHERN SIERRA NEVADA northern Sierra Nevada ® SOUTH COAST INLAND PLAINS&MOUNTAINS NORTH mountain valleys with less marine influence than zone OF SAN FRANCISCO more sunlight and higher sum- 11 mer ETo than zone 3 MID-CENTRAL VALLEY,SOUTHERN SIERRA NEVADA, NORTHERN INLAND VALLEYS valleys north of San 14 TEHACHAPI&HIGH DESERT MOUNTAINS high sum- Franciaco mer sunshine and wind in some locations © UPLAND CENTRAL COAST&LOS ANGELES BASIN NORTHERN&SOUTHERN SAN JOAQUIN VALLEY higher elevation coastal areas 15 slightly lower winter ETo due to fog and slightly higher summer ETo than zones 12& 14 ❑7 NORTHEASTERN PLAINS WESTSIDE SAN JOAQUIN VALLEY&MOUNTAINS ® INLAND SAN FRANCISCO BAY AREA inland area near 16 EAST&WEST OF IMPERIAL VALLEY San Francisco with some marine influence HIGH DESERT VALLEYS valleys in the high desert ICSOUTH COAST MARINE TO DESERT TRANSITION 17 near Nevada and Arizona inland area between marine&desert climates IMPERIAL VALLEY,DEATH VALLEY&PALO VERDE 10 NORTH CENTRAL PLATEAU&CENTRAL COAST 18 low desert areas with high sunlight&considerable RANGE cool, high elevation areas with strong sum- heat advection mer sunlight; zone has limited climate data &the zones selection is somewhat subjective Monthly Average Reference Evapotranspiration by ETo Zone (inches/month) Zone Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Tota I 1 0.93 1.40 2.48 3.30 4.03 4.50 4.65 4.03 3.30 2.48 1.20 0.62 32.9 2 1.24 1.68 3.10 3.90 4.65 5.10 4.96 4.65 3.90 2.79 1.80 1.24 39.0 3 1.86 2.24 3.72 4.80 5.27 5.70 5.58 5.27 4.20 3.41 2.40 1.86 46.3 4 1.86 2.24 3.41 4.50 5.27 5.70 5.89 5.58 4.50 3.41 2.40 1.86 46.6 5 0.93 1.68 2.79 4.20 5.58 6.30 6.51 5.89 4.50 3.10 1.50 0.93 43.9 6 1.86 2.24 3.41 4.80 5.58 6.30 6.51 6.20 4.80 3.72 2.40 1.86 49.7 7 0.62 1.40 2.48 3.90 5.27 6.30 7.44 6.51 4.80 2.79 1.20 0.62 43.3 8 1.24 1.68 3.41 4.80 6.20 6.90 7.44 6.51 5.10 3.41 1.80 0.93 49.4 9 2.17 2.80 4.03 5.10 5.89 6.60 7.44 6.82 5.70 4.03 2.70 1.86 55.1 10 0.93 1.68 3.10 4.50 5.89 7.20 8.06 7.13 5.10 3.10 1.50 0.93 49.1 11 1.55 2.24 3.10 4.50 5.89 7.20 8.06 7.44 5.70 3.72 2.10 1.55 53.1 12 1.24 1.96 3.41 5.10 6.82 7.80 8.06 7.13 5.40 3.72 1.80 0.93 53.4 13 1.24 1.96 3.10 4.80 6.51 7.80 8.99 7.75 5.70 3.72 1.80 0.93 54.3 14 1.55 2.24 3.72 5.10 6.82 7.80 8.68 7.75 5.70 4.03 2.10 1.55 57.0 15 1.24 2.24 3.72 5.70 7.44 8.10 8.68 7.75 5.70 4.03 2.10 1.24 57.9 16 1.55 2.52 4.03 5.70 7.75 8.70 9.30 8.37 6.30 4.34 2.40 1.55 62.5 17 1.86 2.80 4.65 6.00 8.06 9.00 9.92 8.68 6.60 4.34 2.70 1.86 66.5 18 2.48 3.36 5.27 6.90 8.68 9.60 9.61 8.68 6.90 4.96 3.00 2.17 71.6 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.