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