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Changes in wind speed factor could be used to reduce or entirely eliminate the monthly mean differences, 6, at validation gages (Tables 5 and 6). No attempt was made to calibrate UT163 because the data is considered unreliable. Obviously, if the mean differences for all months were reduced or eliminated at a specific gage, the annual mean difference was also reduced or eliminated. However, a probable difference range for each month would generally remain. In other words, calibration could only reduce the bias, not necessarily remove all differences. Table 5 Wind calibration statistics: 1964-1977 Green State Month Jensen River line Cisco UT163 January g 0.01 0.09 - 0.04 0.05 - 0.60 d ± 0.31 ± 0.22 ± 0.29 ± 0.11 ± 0.51 February 6 0.00 0.01 - 0.01 - 0.04 - 0.30 d t 0.59 ± 0.47 ± 0.57 ± 0.54 ± 0.92 March 9 0.00 0.01 0.02 - 0.01 0.62 d ± 0.55 ± 0.38 ± 0.51 ± 0.34 ± 0.57 April 5 0.01 - 0.04 0.03 - 0.01 0.88 d ± 0.73 ± 0.37 ± 0.90 ± 0.67 ± 0.54 May 9 - 1.37 - 0.01 0.00 0.05 - 1.43 d ± 1.19 ± 0.82 ± 0.49 ± 0.65 ± 0:61 June 9 - 0.46 - 0.02 0. 06 - 0.00 - 2.04 d ± 1.46 ± 0.67 ± 0.53 ± 0.44 ± 0.80 July b 0.01 0.06 - 0.01 0.04 - 1.10 d ± 0.99 ± 0.48 ± 0.55 ± 0.51 ± 0.65 August s 0.00 - 0.04 - 0.02 0.01 - . 0.21 d ± 1.12 ± 0.30 ± 0.44 ± 0.52 ± 0.65 September ?, - 0.01 0.00 - 0.03 - 0.02 - 0.17 d ± 0.80 ± 0.38 ± 0.70 ± 0.64 ± 0.66 October 9 0.06 - 0.00 - 0.02 - 0.04 0.42 d ± 0.47 ± 0.35 ± 0.36 ± 0.46 ± 0.92 November g 0.02 0.00 - 0.02 0.02 - 0.16 d ± 0.54 ± 0.29 ± 0.34 ± 0-38 ± 0.69 December s 0.00 - 0.04 0.00 - 0.05 - 1.52 d ± 0.76 ± 0.36 ± 0.28 ± 0.27 ± 0.69 Annual 9 - 0.15 0.00 - 0.01 0.01 - 0.47 d ± 0.87 ± 0.44 ± 0.51 ± 0.47 ± 0.89 Table 6 shows the monthly mean differences at each validation gage for the normal (mean monthly average) calibrated conditions. One could have just as easily calibrated on the normals and compared the results to the historical temperatures. 0 30