Weather Data - Hours available for evaporative cooling:


 Location:  Billings, MT        Elev: 3567    Lat:  45/48N  Long:108/32W

Mean Frequency of occurrence of Dry Bulb Temperature with Mean Coincident Wet Bulb Temperature for each Dry Bulb Temperature Range:

ASHRAE  design Dry Bulb and Mean Coincident Wet Bulb:
   1% Scale:    2.5% Scale:    5% Scale:            Design Wet Bulb:
Db       Wb       Db      Wb        Db      Wb           1%     2.5%     5%
94      64       91      64         88      63           67      66        64
  
Average number of hours within each temperature range and discharge temp. (see notes):

January - April Weather Data

Temp Range: Deg (f) January February March April Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                          
100 104 102                          
95 99 97                          
90 94 92                          
85 89 87                          
80 84 82                   3 55 56.4 3.0
75 79 77                    6 53 54.2 6.0
70 74 72             2 50 51.1 16 51 49.9 18.0
65 69 67       1 49 50.2 7 48 49.0 22 49 47.8 30.0
60 64 62 1 45 45.9 2 47 47.8 14 46 46.8 42 47 45.6 195.0
55 59 57 4 42 42.8 11 44 44.7 24 43 43.7 56 45 45.6 95.0
50 54 52 11 40 40.6 24 41 41.6 40 41 41.6 77 42 42.5 152.0
45 49 47 36 37 37.5 45 38 38.5 58 38 38.5 106 39 39.4 245.0
40 44 42 68 34 34.4 8 34 34.4 92 35 35.4 113 37 37.3 281.0
35 39 37 88 31 31.3 102 32 32.2 115 32 32.2 106 33 33.2 328.0
30 34 32 97 28 28.2 107 28 28.2 122 29 29.2 94 30 30.1 420.0
Total hours Temp out over 40(f) 16   38   87   222 Total hours for this period 499.0

Note: 1.  Db = Dry Bulb(f) temperature, Wb = Mean coincident wet bulb temp (f).  Tout = Discharge Temperature (f).   Only hours where discharge temp is over 400(f) is included in total hours available for evaporative cooling.

May - August Weather Data

Temp Range: Deg (f) May June July August Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                          
100 104 102             2 68 67.6 1 67 69.5 3
95 99 97       2 64 65.7 12 66 67.6 7 65 67.4 21
90 94 92 1 61 62.6 7 63 64.5 42 64 65.4 33 63 65.2 83
85 89 87 4 60 61.4 22 63 64.2 68 63 64.2 55 62 64.0 149
80 84 82 13 59 60.2 40 61 62.1 87 62 63.0 78 61 62.8 218
75 79 77 29 57 58.0 60 59 59.9 97 60 60.9 97 59 60.7 283
70 74 72 43 55 55.9 84 57 57.8 114 58 58.7 104 57 58.5 345
65 69 67 70 52 53.0 102 56 56.8 119 56 56.6 116 56 57.3 407
60 64 62 93 50 50.6 129 53 53.5 105 54 54.4 120 54 55.2 447
55 59 57 113 48 48.5 120 51 51.3 66 51 51.3 86 51 52.1 385
50 54 52 128 46 46.3 97 48 48.2 23 48 48.2 37 48 49.0 285
45 49 47 121 43 43.2 42 44 44.4 4 45 45.1 8 44 44.9 175
40 44 42 83 39 39.2 11 40 40.6 1 41 41.1 1 39 39.9 96
35 39 37 29 35 35.4 3 36 36.8              
30 34 32 10 31 31.6 3 33 34.0              
Total hours Temp out over 40(f) 615   716   740   742 Total hours for this period 2801.0

September - December Weather Data

Temp Range: Deg (f) September October November December Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                          
100 104 102                          
95 99 97 1  63 64.7                   1.0
90 94 92 5  62 63.5                   5.0
85 89 87 15  60 61.4 1 58 59.5             16.0
80 84 82 30 59 60.2 8 56 57.3             38.0
75 79 77 43 57 58.0 16 54 55.2             59.0
70 74 72 67 55 55.9 32 52 53.0             99.0
65 69 67 80 53 53.7 45 50 50.9 3 49 49.9       128.0
60 64 62 101 50 50.6 70 48 48.7 11 46 46.8 1 45 45.9 183.0
55 59 57 110 48 48.5 90 45 45.6 29 44 44.7 45 42 42.8 274.0
50 54 52 105 45 45.4 106 43 43.5 52 41 41.6 42 40 40.6 305.0
45 49 47 78 42 42.3 119 40 40.4 80 38 38.5 40 37 37.5 197.0
40 44 42 53 39 39.2 100 37 37.3 113 35 35.4 37 34 34.4 203.0
35 39 37 21 35 35.1 73 33 33.2 118 32 32.3 34 31 31.3 246
30 34 32 11 31 31.1 57 30 30.1 111 29 29.2 31 28 28.8 210
Total hours Temp out over 40(f) 635   487   95   88 Total hours for this period 1305.0
Total hours available for evaporative cooling  

Data published by Premier Industries, Inc., in part from data contained in EcoDyne's Weather Data Handbook no longer in print.  Premier Industries, Inc., provides these data for informational use only.  All reasonable precautions have been taken to maintain integrity in these data however  Premier Industries will not be responsible for it's accuracy.  Any responsibility for the use of this information shall be borne by the user.