Monthly Means and Extremes
                                                 Sisters Ranger District, Oregon       Period: 1961-1990

Parameter                 Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec   Year
Mean Temperature(F)
   Maximum                 41.4  46.2  51.3  56.9  65.6  75.1  83.6  83.0  74.7  63.3  47.7  41.0   61.2
   Minimum                 20.8  23.7  25.5  27.7  32.7  38.9  41.3  41.2  34.5  28.9  25.6  20.3   30.4
   Mean                    31.1  35.0  38.4  42.3  49.1  57.0  62.5  62.0  54.5  46.0  36.7  30.7   45.8
Extreme Temperature(F)
   Maximum                   65    70    78    86    98   103   109   106    97    90    73    63    109
   Minimum                  -28   -22     8     9    14    20    24    26    15     1   -13   -28    -28
Precipitation(inches)
   Monthly mean            2.55  1.66  1.23   .74   .55   .53   .41   .43   .49   .81  2.20  2.45  14.18
   Extreme 24 hr           2.02  2.27   .94  1.52  1.11  1.32  1.25   .66  1.36  1.27  2.33  2.80   2.80
Snowfall(inches)
   Monthly mean            8.85  5.48  4.50   .31   .04   .00   .00   .00   .00   .15  4.72  7.30  39.42
Average number of days
   Temperature
      Maximum 90 or more     .0    .0    .0    .0    .1   2.4   8.4   7.9   1.5    .0    .0    .0   22.7
      Maximum 32 or less    4.4   1.4    .1    .0    .0    .0    .0    .0    .0    .0   1.2   4.8   12.2
      Minimum 32 or less   27.2  23.7  25.7  22.3  15.7   7.0   3.0   2.9  12.5  21.3  22.7  28.0  207.6
      Minimum 0 or less     1.5   1.0    .0    .0    .0    .0    .0    .0    .0    .0    .5   1.8    4.5
   Precipitation
      .01 inches or more    9.6   8.2   8.8   6.5   5.3   4.2   2.7   3.4   3.5   5.7  10.8  10.0   81.7
      .10 inches or more    6.2   4.5   4.3   2.2   1.7   1.3   1.1   1.7   1.5   2.4   5.7   5.9   40.7
      .50 inches or more    1.4    .7    .5    .2    .2    .2    .2    .1    .1    .3   1.1   1.1    5.8
      1.00 inches or more    .5    .3    .0    .1    .1    .1    .1    .0    .1    .1    .4    .4    1.7
Degree Days
   Heating days @ 65       1050   847   826   680   493   256   122   135   319   590   850  1062   7093
   Growing days @ 50          0     1     1    16    78   228   390   371   169    34     2     0   1328

                                                                         Oregon Climate Service