Monthly Means and Extremes                                         Period:     1971-2000
Pelton Dam, OR

Parameter                  Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec    Year
Mean Temperature(F)
   Maximum                 46.1  53.0  61.7  69.5  78.3  86.5  95.4  95.1  86.1  72.3  54.3  46.0    70.4
   Minimum                 25.9  28.6  31.2  34.8  40.5  46.4  50.6  50.2  43.5  36.1  31.5  26.4    37.1
   Mean                    36.0  40.8  46.5  52.2  59.4  66.5  73.0  72.7  64.8  54.2  42.9  36.2    53.8
Extreme Temperature(F)
   Maximum                   71    78    86    95   108   108   114   117   108   103    81    68     114
   Minimum                  -10   -11    10    17    24    29    36    36    25    14    -2   -15     -15
Precipitation(inches)
   Monthly mean            1.65  1.10   .95   .80   .85   .56   .37   .44   .41   .65  1.53  1.49   10.80
   Extreme 24 hr            .93  1.10   .71  1.22  1.34   .75   .89   .72  1.15   .74  2.80  1.01    2.80
Snowfall(inches)
   Monthly mean             .90   .01   .00   .00   .00   .00   .00   .00   .00   .00   .68  1.06    2.16
Average number of days
   Temperature
      Maximum 90 or more     .0    .0    .0    .6   4.0  10.1  21.5  21.5  10.6   1.1    .0    .0    68.5
      Maximum 32 or less    3.3    .9    .0    .0    .0    .0    .0    .0    .0    .0    .6   2.7     7.5
      Minimum 32 or less   23.8  19.2  18.8  11.7   4.1    .2    .0    .0   1.3  10.0  16.4  24.1   131.2
      Minimum 0 or less      .5    .4    .0    .0    .0    .0    .0    .0    .0    .0    .1    .5     1.6
   Precipitation
      .01 inches or more    9.9   9.8   8.6   6.6   6.0   4.2   2.6   2.7   3.5   5.1  10.4  10.1    78.5
      .10 inches or more    5.3   3.5   3.3   2.5   3.0   1.8   1.4   1.4   1.4   2.2   4.3   4.7    34.4
      .50 inches or more     .6    .3    .2    .2    .2    .2    .2    .2    .1    .2    .6    .5     3.4
      1.00 inches or more    .0    .0    .0    .1    .1    .0    .0    .0    .0    .0    .1    .0      .4
Degree Days
   Heating days @ 65 (F)    906   693   591   406   223    74    14    11    96   361   673   906    5021
   Growing days @ 50 (F)      3     6    24   107   279   467   689   682   421   151    17     4    2819