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0°C 5°C 10°C 15°C 20°C 25°C 30°C 35°C 40°C 45°C 48.9°C
0 10
20 25 30
35
40
45
50
55
60
65
70
75
80
85
DE
W P
OIN
T TE
MP
ER
ATU
RE
- °F
35°F 40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F 85°F 90°F 95°F 100°F 105°F 110°F 115°F 120°F
DRY BULB TEMPERATURE
.002
.004
.006
.008
.010
.012
.014
.016
.018
.020
.022
.024
.026
.028
HU
MID
ITY
RA
TIO
- P
OU
ND
S M
OIS
TUR
E P
ER
PO
UN
D D
RY
AIR
(GR
AM
S P
ER
GR
AM
- S
AM
E)
35°F (1.7°C)
40°F (4.4°C)
45°F (7.2°C)
50°F (10°C)
55°F (12.8°C)
60°F (15.6°C)
65°F (18.3°C)
70°F (21.1°C)
75°F (23.9°C)
80°F (26.7°C)
(1.7) 35
(7.2) 45
(12.8) 55
(15.6) 60
(21.1) 70
(23.9) 75
(26.7) 80
(29.4) 85
90°F (32.2°C)
(4.4) 40
(10) 50
(18.3) 65
85°F (29.4°C) WET BULB TEMPERATURE
SATURATION TEMPERATURE - (
°C) °
F
10% RELATIVE HUMIDITY20%
30%
40%
50%60%
70%80%
90%
30
35
40
45
50
55
60
EN
THA
LPY
- B
TU P
ER
PO
UN
D O
F D
RY
AIR
10 15 20 25ENTHALPY - BTU PER POUND OF DRY AIR
55 (127.9)
60 (139.6)
15 (34.9)
20 (46.5)
25 (58.2)
30 (69.8)
35 (81.4)
40 (93.0)
45 (104.7)
50 (116.3)
ENTHALPY - B
TU PER POUND OF D
RY AIR (kJ/k
g)
SI enth
alpy i
s con
verte
d dire
ctly fro
m US en
thalpy
, whic
h follo
ws the
prac
tice of
settin
g zero
entha
lpy at
0°F
14.0 (0.875) VOLUM
E - CU.FT. PER LB. DRY AIR (M3/kg)
12.5 (0.781)
13.0 (0.812)
13.5 (0.843)
14.5 (0.906)
15.0 (0.938)
PSYCHROMETRIC CHART - US and SI UnitsSEA LEVELBarometric Pressure: 29.921 Inches of Mercury (101.04 kPa)
SummerComfort
ZoneWinterComfort
Zone
