2017 ASHRAE Handbook - Fundamentals (IP) © 2017 ASHRAE, Inc.

JORDAN AP, MT, USA WMO#: 727684

Lat: 47.326N Long: 106.948W Elev: 2662 StdP: 13.34 Time Zone: -7.00 (NAM) Period: 90-14 WBAN: 94051
Annual Heating and Humidification Design Conditions
Humidification DP/MCDB and HR Coldest month WS/MCDB MCWS/PCWD
Coldest Heating DB
99.6% 99% 0.4% 1% to 99.6% DB
Month
99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD
(a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) (o)
(1) 1 -22.9 -15.6 -26.4 1.4 -17.7 -21.1 1.9 -12.7 29.7 29.3 26.5 26.0 3.5 280 (1)

Annual Cooling, Dehumidification, and Enthalpy Design Conditions

Hottest Cooling DB/MCWB Evaporation WB/MCDB MCWS/PCWD
Hottest
Month 0.4% 1% 2% 0.4% 1% 2% to 0.4% DB
Month
DB Range DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD
(a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) (o) (p)
(2) 7 29.7 96.1 64.2 92.5 63.3 89.1 62.6 68.2 86.8 66.3 84.6 64.5 83.2 9.9 150 (2)

Dehumidification DP/MCDB and HR Enthalpy/MCDB

Extreme
0.4% 1% 2% 0.4% 1% 2%
Max WB
DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB
(a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) (o) (p)
(3) 62.8 94.4 74.5 60.2 86.0 72.5 57.5 77.8 70.7 34.0 88.5 32.3 84.1 30.9 82.9 75.6 (3)

Extreme Annual Design Conditions

Extreme Annual Temperature n-Year Return Period Values of Extreme Temperature
Extreme Annual WS
Mean Standard Deviation n=5 years n=10 years n=20 years n=50 years
1% 2.5% 5% Min Max Min Max Min Max Min Max Min Max Min Max
(n) (o) (p) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m)
(4) 26.2 22.8 19.6 DB -32.8 101.2 7.5 3.3 -38.2 103.6 -42.6 105.5 -46.8 107.4 -52.3 109.8 (4)
(5) WB -27.7 70.8 5.1 2.4 -31.3 72.6 -34.3 74.0 -37.2 75.3 -40.9 77.1 (5)

Monthly Climatic Design Conditions

Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
(d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) (o) (p)
(6) DBAvg 44.2 18.1 21.3 33.6 44.0 53.3 62.6 71.0 69.3 58.6 44.9 31.2 20.8 (6)
(7) DBStd 21.45 16.20 15.23 12.62 8.54 8.18 7.35 6.64 7.16 8.40 9.26 12.85 15.94 (7)
(8) Temperatures, HDD50 4286 988 804 514 218 58 3 0 1 20 207 567 906 (8)
(9) Degree-Days HDD65 8074 1453 1224 972 631 372 130 20 39 225 624 1014 1370 (9)
(10) and CDD50 2162 0 0 7 37 159 380 650 599 278 49 3 0 (10)
(11)
Degree-Hours CDD65 476 0 0 0 0 7 57 205 173 33 1 0 0 (11)
(12) CDH74 8246 0 0 3 48 232 963 3187 2763 947 103 0 0 (12)
(13) CDH80 3827 0 0 0 7 58 357 1601 1366 413 25 0 0 (13)

(14) Wind WSAvg 8.0 7.5 7.1 8.3 9.4 9.4 8.9 7.9 7.9 7.6 7.9 7.6 6.8 (14)

(15) PrecAvg 13.00 0.40 0.30 0.50 1.20 2.00 2.50 1.70 1.10 1.10 0.80 0.40 0.40 (15)
(16) PrecMax 22.10 1.70 1.80 1.40 3.30 4.90 5.70 7.40 3.20 5.20 2.90 1.20 1.70 (16)
Precipitation
(17) PrecMin 5.90 0.00 0.00 0.00 0.10 0.10 0.30 0.00 0.10 0.00 0.00 0.00 0.00 (17)
(18) PrecStd 3.60 0.40 0.30 0.30 0.80 1.10 1.50 1.40 0.80 1.20 0.70 0.30 0.30 (18)

(19) DB 55.0 61.9 71.3 80.3 86.4 95.2 101.4 99.5 95.3 83.3 67.3 62.5 (19)
0.4%
(20)
Monthly Design MCWB 41.4 44.9 49.8 54.7 60.8 65.4 66.1 64.9 62.8 56.2 48.9 41.5 (20)
(21) Dry Bulb DB 47.8 52.6 64.9 73.2 80.4 88.5 96.8 95.4 90.0 75.7 58.8 52.0 (21)
2%
(22) and MCWB 38.4 40.6 47.5 52.6 58.4 64.3 65.1 63.2 60.0 53.1 44.6 38.9 (22)
(23) Mean Coincident DB 43.0 45.7 58.5 67.2 75.2 83.8 92.9 92.0 84.7 68.9 54.1 45.8 (23)
Wet Bulb 5%
(24) MCWB 35.7 36.5 44.4 49.9 56.5 62.5 64.2 62.7 58.7 51.6 42.3 36.7 (24)
Temperatures
(25) DB 39.1 40.5 52.4 61.9 70.7 79.4 89.5 88.3 79.2 62.6 48.8 41.1 (25)
10%
(26) MCWB 33.6 34.1 41.2 47.0 54.5 60.5 63.8 62.0 56.9 48.4 39.4 34.5 (26)

(27) WB 42.8 45.6 50.9 56.5 63.1 69.9 71.3 69.5 66.1 58.0 51.1 43.1 (27)
0.4%
(28)
Monthly Design
MCDB 53.5 61.5 68.7 77.4 78.7 88.3 88.4 88.6 84.2 78.6 64.0 57.0 (28)
(29) Wet Bulb WB 38.9 40.8 48.2 53.2 60.0 66.4 69.0 66.7 62.3 54.7 45.7 39.8 (29)
2%
(30) and MCDB 46.9 51.8 63.6 70.7 76.1 82.9 87.7 85.7 82.8 72.4 57.5 49.7 (30)
(31) Mean Coincident WB 36.2 37.1 44.9 50.7 57.7 64.1 67.2 64.8 59.9 51.9 42.6 37.2 (31)
Dry Bulb 5%
(32) MCDB 42.2 44.7 57.6 66.6 72.4 80.1 85.7 84.4 80.7 67.4 52.3 45.8 (32)
Temperatures
(33) WB 33.9 34.4 41.7 47.7 55.5 62.0 65.3 63.2 57.7 49.2 39.9 34.6 (33)
10%
(34) MCDB 39.1 40.3 51.5 60.2 68.2 77.4 83.9 83.5 78.1 61.8 48.0 41.2 (34)

(35) MDBR 23.3 24.0 23.8 25.3 24.9 25.3 29.7 30.3 31.0 26.6 24.4 24.1 (35)
(36) Mean Daily MCDBR 26.0 29.5 35.1 36.3 33.2 33.7 35.6 37.3 41.9 39.1 31.2 27.1 (36)
5% DB
(37) Temperature MCWBR 18.2 19.4 19.9 18.9 16.0 14.5 12.1 13.8 18.5 20.5 19.1 17.8 (37)
(38) Range MCDBR 24.8 27.7 33.3 34.1 29.1 29.3 30.6 30.8 35.9 36.3 29.4 25.5 (38)
5% WB
(39) MCWBR 17.9 18.8 19.3 17.9 14.5 13.7 11.8 12.0 16.2 19.4 18.7 17.6 (39)

(40) taub 0.248 0.255 0.271 0.309 0.332 0.346 0.356 0.360 0.317 0.282 0.257 0.244 (40)
Clear-Sky
(41) taud 2.550 2.574 2.587 2.470 2.454 2.455 2.442 2.396 2.503 2.593 2.572 2.538 (41)
Solar
(42) Irradiance Ebn,noon 278 299 307 301 296 291 286 280 285 283 272 266 (42)
(43) Edh,noon 18 23 26 32 34 34 34 35 28 22 18 16 (43)

(44) All-Sky Solar RadAvg 491 803 1163 1525 1813 2080 2202 1821 1370 882 536 377 (44)
(45) Radiation RadStd 45 78 61 64 145 102 78 101 74 62 49 41 (45)

Nomenclature: See separate page