Perry525

Gary, good site, have been there before.
You may find this handy?
WHAT IS DEW POINT? The temperature at which moisture will condense.

Example: At sea level 14.696 psiA), if air temperature is 70° F and relative humidity is 65%, the dew point is 57° F. see below.

Dewpoint varies with pressure, temperature, and relative humidity.


Dew Point Calculation Chart (Fahrenheit)


AMBIENT AIR TEMPERATURE IN FAHRENHEIT
20 30 40 50 60(70)80 90 100 110 120
RH%
90 18 28 37 47 57 67 77 87 97 107 117
85 17 26 36 45 55 65 75 84 95 104 113
80 16 25 34 44 54 63 73 82 93 102 110
75 15 24 33 42 52 62 71 80 91 100 108
70 13 22 31 40 50 60 68 78 88 96 105
65 12 20 29 38 47(57)66 76 85 93 103
60 11 19 27 36 45 55 64 73 83 92 101
55 9 17 25 34 43 53 61 70 80 89 98
50 6 15 23 31 40 50 59 67 77 86 94
45 4 13 21 29 37 47 56 64 73 82 91
40 1 11 18 26 35 43 52 61 69 78 87
35 -2 8 16 23 31 40 48 57 65 74 83
30 -6 4 13 20 28 36 44 52 61 69 77

At Sea Level (14.696 psiA)



Dew Point and Relative Humidity Explained

Relative Humidity and Dew Point are closely related, and are based upon the amount of water vapor in the air and the total amount of water vapor that the air can hold at a given temperature.
Perry