2021 ASHRAE Handbook — Fundamentals (SI)
© 2021 ASHRAE, Inc.
HAIL, Saudi Arabia
Lat: 27.438N
Lon: 41.686E
Elev: 1015
StdP: 89.71
WMO: 403940
Time Zone: 3.00 (E03)
Period: 94-19
WBAN: 99999
Annual Heating, Humidification, and Ventilation Design Conditions
Coldest
Month
Heating DB
99.6%
(a)
(1)
(b)
1
0.8
99%
(c)
2.7
DP
(d)
-12.1
Humidification DP/MCDB and HR
99.6%
99%
HR
MCDB
DP
HR
(e)
1.5
(f)
13.0
(g)
(h)
-9.9
1.8
MCDB
(i)
13.1
Coldest Month WS/MCDB
0.4%
1%
WS
MCDB
WS
MCDB
(j)
(k)
12.0
18.3
(l)
10.5
MCWS/PCWD
to 99.6% DB
MCWS
PCWD
(m)
(n)
17.0
(o)
1.5
180
WSF
(p)
0.483
(1)
Annual Cooling, Dehumidification, and Enthalpy Design Conditions
(2)
Hottest
Month
Hottest
Month
DB Range
(a)
(b)
8
15.5
0.4%
HR
DP
(a)
(3)
(b)
15.2
12.2
0.4%
DB
MCWB
(c)
42.1
(d)
18.7
Cooling DB/MCWB
1%
DB
MCWB
(e)
41.2
(f)
18.3
Dehumidification DP/MCDB and HR
1%
MCDB
DP
HR
MCDB
(c)
20.4
(d)
14.0
(e)
11.3
(f)
20.0
2%
DB
MCWB
(g)
(h)
40.2
DP
(g)
12.8
18.0
2%
HR
(h)
10.4
0.4%
WB
MCDB
(i)
19.7
MCDB
(i)
20.2
(j)
(k)
38.8
Enth
Evaporation WB/MCDB
1%
WB
MCDB
19.2
0.4%
MCDB
(j)
60.8
(k)
38.6
(l)
38.3
WB
(m)
18.7
Enthalpy/MCDB
1%
Enth
MCDB
(l)
58.5
MCWS/PCWD
to 0.4% DB
MCWS
PCWD
2%
(m)
38.5
MCDB
(n)
(o)
37.9
4.0
2%
Enth
(n)
56.9
MCDB
(o)
37.5
(p)
30
(2)
Extreme
Max WB
(p)
27.6
(3)
Extreme Annual Design Conditions
Extreme Annual Temperature
Mean
Standard Deviation
Min
Max
Min
Max
Extreme Annual WS
1%
2.5%
(a)
(4)
(5)
(b)
10.4
9.3
5%
(c)
8.0
(e)
(f)
(g)
(h)
n-Year Return Period Values of Extreme Temperature
n=5 years
n=10 years
n=20 years
n=50 years
Min
Max
Min
Max
Min
Max
Min
Max
(i)
(j)
-3.4
-5.2
43.5
22.0
2.3
2.3
0.8
1.8
-5.1
-6.8
44.0
23.3
Annual
Jan
Feb
Mar
Apr
May
(d)
(e)
(f)
(g)
(h)
(i)
22.9
8.26
48
654
4744
2309
36656
23438
3.3
85
245
11
45
11.4
3.57
26
217
68
1
21
1
3.2
12
41
0
11
25.9
13.0
23.2
11.9
21.2
11.2
19.0
10.2
15.1
22.3
13.6
20.5
12.2
18.9
10.9
17.6
13.6
3.67
8
138
108
4
90
13
3.5
6
32
0
11
28.6
13.9
26.0
13.2
24.0
11.9
21.9
11.0
15.8
24.1
14.1
22.8
13.0
21.9
11.7
20.5
17.3
3.71
1
63
228
33
473
151
3.7
22
83
2
26
33.1
14.9
30.3
14.2
28.1
13.5
25.9
12.7
17.1
26.5
15.5
26.4
14.4
25.4
13.3
24.3
22.6
3.23
0
5
377
132
1566
687
3.9
11
47
0
12
36.1
16.0
34.2
16.1
32.8
15.5
30.8
14.9
18.9
27.8
17.6
28.8
16.7
28.1
15.9
27.7
14.0
16.3
8.4
14.4
7.9
0.383
2.105
882
148
14.2
16.7
7.8
14.9
7.5
0.447
1.909
843
191
5.12
0.22
DB
WB
(k)
(l)
(m)
(n)
(o)
(p)
-6.5
-8.2
44.5
24.3
-7.8
-9.4
45.0
25.3
-9.5
-11.1
45.5
26.6
Jun
Jul
Aug
Sep
Oct
Nov
Dec
(j)
(k)
(l)
(m)
(n)
(o)
(p)
27.6
2.69
0
0
547
289
4092
2375
3.8
7
40
0
10
39.9
17.5
38.2
17.1
36.9
16.8
35.7
16.5
19.8
33.5
18.7
33.1
17.8
33.1
17.1
32.7
31.1
1.90
0
0
632
382
6394
4282
3.5
0
2
0
0
41.9
18.1
40.9
17.8
40.0
17.6
38.9
17.1
20.1
38.3
18.7
38.9
18.1
38.5
17.5
37.6
32.1
2.09
0
0
686
428
7478
5203
3.4
0
4
0
1
43.0
18.8
42.0
18.6
41.0
18.2
40.0
17.8
20.1
40.4
19.2
40.0
18.7
39.5
18.1
38.9
32.8
2.00
0
0
708
449
7857
5554
3.0
0
1
0
0
43.1
19.4
42.1
19.0
41.3
18.6
40.8
18.4
21.0
40.1
19.9
40.3
19.2
39.7
18.8
39.3
30.2
2.21
0
0
606
356
5646
3687
2.9
0
1
0
0
41.2
18.3
40.2
18.0
39.2
17.7
38.1
17.3
19.6
38.8
18.7
38.3
18.2
38.0
17.6
37.1
24.9
2.64
0
1
463
204
2639
1389
3.1
7
30
1
9
37.0
17.1
35.8
16.5
34.8
16.0
33.2
15.5
18.9
30.0
17.6
30.4
16.8
30.8
16.2
30.8
17.4
3.49
1
58
222
29
363
94
3.0
12
46
0
15
31.0
15.4
29.2
14.3
27.5
14.0
25.2
13.4
17.7
24.1
16.6
23.6
15.7
22.7
14.7
22.0
12.8
3.30
12
172
98
1
36
1
3.0
7
55
0
12
26.1
12.8
24.2
13.0
22.2
12.1
20.2
11.1
16.3
22.2
14.5
21.2
13.3
19.9
12.0
18.4
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
14.3
16.2
6.5
14.2
6.3
0.521
1.763
792
227
14.4
15.8
6.3
14.7
6.1
0.543
1.727
772
236
15.4
16.3
6.4
15.3
6.5
0.492
1.844
809
209
15.1
15.9
6.3
15.1
6.3
0.469
1.937
826
190
15.5
15.9
6.3
15.1
6.3
0.510
1.827
790
211
15.9
16.3
6.5
15.5
6.4
0.476
1.884
805
193
15.7
16.8
7.1
15.2
6.5
0.468
1.894
780
180
13.4
16.3
7.4
12.7
6.3
0.416
2.026
798
147
13.4
15.9
8.3
13.5
7.6
0.365
2.170
845
123
(35)
(36)
(37)
(38)
(39)
6.19
0.21
6.87
0.21
7.45
0.31
8.22
0.20
8.00
0.22
7.42
0.20
6.57
0.20
5.44
0.18
4.27
0.27
3.86
0.17
(44)
(45)
1% DB
Cooling
1% WB
1% DP
(4)
(5)
Monthly Climatic Design Conditions
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
Temperatures,
Degree-Days
and
Degree-Hours
(14)
DBAvg
DBStd
HDD10.0
HDD18.3
CDD10.0
CDD18.3
CDH23.3
CDH26.7
Wind
WSAvg
(15)
(16)
(17)
(18)
Precipitation
PrecAvg
PrecMax
PrecMin
PrecStd
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
Monthly Design
Dry Bulb
and
Mean Coincident
Wet Bulb
Temperatures
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
Monthly Design
Wet Bulb
and
Mean Coincident
Dry Bulb
Temperatures
(35)
(36)
(37)
(38)
(39)
Mean Daily
Temperature
Range
(40)
(41)
(42)
(43)
Clear-Sky
Solar
Irradiance
taub
taud
Ebn at Noon
Edh at Noon
13.3
15.8
8.2
13.6
7.8
0.341
2.254
896
117
(44)
(45)
All-Sky Solar
Radiation
RadAvg
RadStd
4.21
0.24
0.4%
2%
5%
10%
0.4%
2%
5%
10%
5% DB
5% WB
DB
MCWB
DB
MCWB
DB
MCWB
DB
MCWB
WB
MCDB
WB
MCDB
WB
MCDB
WB
MCDB
MDBR
MCDBR
MCWBR
MCDBR
MCWBR
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(40)
(41)
(42)
(43)
Historical Trends
DBAvg
(d)
(46)
(47)
Station Only
Regional (0 neighbors)
+0.49
N/A
Heating
99% DB 99% DP
(e)
N/A
N/A
(f)
N/A
N/A
(g)
+0.24
N/A
(h)
N/A
N/A
(i)
N/A
N/A
Degree-Days
HDD10.0 HDD18.3 CDD10.0 CDD18.3
(j)
N/A
N/A
(k)
-52
N/A
(l)
+215
N/A
(m)
+165
N/A
(46)
(47)
2021 ASHRAE Handbook — Fundamentals (SI)
Nomenclature — Tables of Climate Design Conditions
CDDn
CDHn
DB
DBAvg
DBStd
DP
Ebn at Noon
Edh at Noon
Elev
Enth
HDDn
HR
Lat
Long
MCDB
MCDBR
MCWB
MCWBR
MCWS
MDBR
PCWD
Period
PrecAvg
PrecMax
PrecMin
PrecStd
RadAvg
RadStd
StdP
taub
taud
Time Zone
WB
WBAN
WMO
WS
WSAvg
WSF
Cooling degree-days base n°C, °C-day
Cooling degree-hours base n°C, °C-hour
Dry bulb temperature, °C
Average daily dry bulb temperature, °C
Standard deviation of daily average dry bulb temperature, °C
Dew point temperature, °C
Clear sky beam normal irradiance at solar noon, W/m²
Clear sky diffuse horizontal irradiance at solar noon, W/m²
Elevation, m
Enthalpy, kJ/kg
Heating degree-days base n°C, °C-day
Humidity ratio, g of moisture per kg of dry air
Latitude, °
Longitude, °
Mean coincident dry bulb temperature, °C
Mean coincident dry bulb temperature range, °C
Mean coincident wet bulb temperature, °C
Mean coincident wet bulb temperature range, °C
Mean coincident wind speed, m/s
Mean dry bulb temperature range, °C
Prevailing coincident wind direction, °, 0 = North, 90 = East
Range of years used to calculate design conditions
Average precipitation, mm
Maximum precipitation, mm
Minimum precipitation, mm
Standard deviation of precipitation, mm
Average daily all sky solar radiation, kWh/m²
Standard deviation of average daily all sky solar radiation, kWh/m²
Standard pressure at station elevation, kPa
Clear sky optical depth for beam irradiance
Clear sky optical depth for diffuse irradiance
Hours ahead or behind UTC, and time zone code
Wet bulb temperature, °C
Weather Bureau Army Navy number
Station identifier derived from the World Meteorological Organziation
Wind speed, m/s
Average wind speed, m/s
Weather and shielding factor
Numbers (1) to (47) and letters (a) to (p) are row and column references to quickly point to an element in the table.
For example, the 5% design wet bulb temperature for July can be found in row (31), column (k).
© 2021 ASHRAE, Inc.