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_5V)LS - ] RAZ 6 BUREAU OF CHEMISTRY A-D SOILS, 1932 Tent 1.-Normal monthllr, seasonal, and annual temperature and precipitation at Lodi, San Joaquin County, Calif. r (Elevation,50 feet] ,k I Temperature Precipitation I Month I Total' Total Absolute Mean man- Absolute Mean amount for amount for mum minimum the driest the wettest year(1929) year(1906) °F. °F. °F. Inches Inches Inches December---------------------------- I46.6 68 ^-1 2.79 2.53 9.47 January------------------------------ 46.2 70 22 3.78 1.12 5.96 February---------------------------- 50.1 82 24 2.71 1.17 3.30 Winter------------------------- 47.6 82 21 9.28 4.82 18 73 March............................... 54.0 81 29 3.30 1.34 8.70 April_________________________________ 57.9 03 32 1.22 .44 1.95 May_________________________________ 63.2 104 36 .94 (1) 2.71 Spring-------------------------1 58.4 104 29 5.46 1.78 13.36 Jtme--------------------------------- 69.2 104 43 .22 1.03 .46 July---------------------------------- 73.3 110 45 (') (') 0 August------------------------------ 72.0 106 40 .02 0 (1) Summer----------------------- 71.5 110 40 .24 1.03 .46 September........................... 68.6 105 40 .35 .00 .14 October------------------------------ 61.5 92 31 .97 .O6 p) November--------------------------- 517 78 25 1.96 0 1.00 Fall____________________________ 60.9 105 25 3.28 O6 1.25 Year--------------------------- 59.6 110 21 18.26 7.69 53.78 t Trace. Agricultural practices are closely related to local climatic condi- tions. Crops grown during the summer are commonly irrigated, although in a few places the moisture stored in the soily during the rainv season is sufficient to carry the crop to maturity. Nonirrigated crops, such as small grains, are planted principally in autumn, make their greatest growth during the winter and spring, and are har- vested in the early part of the dry season. Native forage plants begin growth with the advent of the autumn rains and serve as pasture for livestock until late spring. After this local forage is exhausted the animals are moved, either to the upper slopes of the Sierra Nevada to the east or down on the grain-stubble and other fields of the lowlands, where a high water table promotes plant growth throughout the summer. With irrigation, the growing of such perennial crops as tree fruits and grapes is marked by winter dormancy and summer activity. The average date of the latest killing frost is March 5, and that of the first is November 15, giving an average frost-free season of 255 days. Frost has been recorded as late as `May 1 and as early as October 4. The occurrence of spring frosts, when plants are begin- iiing their growth, is a critical factor in the more intensive agricul- tural pursuits. Oil-burning heaters are kept ready for use in a large '} proportion of orchards until the middle or latter part of 11May, at which time danger from frost is considered to have passed. Soil characteristics and features of relief associated with the climatic conditions are discussed elsewhere in this report. I� I� � y