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238 Table 1. CHAPTER 14 i ' Winter Climatic Conditions3--(Concluded) 1948 Guide Col. 1 Col. 2 Col. 3 Col. 4 Col. 5 Stats Station1* Ele vation Period of - - Record* Lowest Temp. on Record*1 FT F Wise.___ Green Bay____ CO La Creese^....... CO La Crosse. ... AP Madison__ _ CO Madison_______AP Milwaukee.__ CO Milwaukee.____ AP Wyo.;-- Cheyenne_____ CO Cheyenne.___ ...AP Lander________CO Lander________AP Rock Springa_..AP 598 725 677 1008 884 744 707 6144 6161 5448 5568 6746 1886-1947 1872-1947 1943-1947 1858-1947 1935-1939*1 1870-1947 1927-1947 1873-1935 1935-1947 1891-1946 1946-1947 1932-1942 -36 -43 -28 -29 -25 -29 -38 -34 -40 -14 -33 Col. 6 Average Annual Min. Temp. oF Col. 7 Col. 8 Design Drt-'Bttlb Temp, on TAC97M% Basis1 . " Wind Vel. at Design Temp. F Mph -18 -21 - -17 6.9 -8 9.1 -12 -6 11.9 -3 11.1 -12 -7 9.1 Col. 9 Design Dbt-Bulb Temp, in Common UsEb F Col. 10 Avg. Wind Veu-Dbc. Jan.-Fzb.5 Mph --20 -25 10.6 8.9 -15 10.1 -15 12.1 15 13.3 -18 3.9* Alta___ Edmonton___ '___ B. Vancouver......... Victoria... Man.___ Winnipeg.............. aN. B___ Fredericton___ _ n. ___ Yarmouth..... . .... Ont.____ Tendon Ottawa.__ Port Arthur. ____ Toronto-................ P. E. L__ Charlottetown.___ Que____ Montreal................ Quebec.. ............. Saak.___ Prince Albert-__-- Y. T.___ Dawson____ ___ Newf.__ St. Johns.... ....... 2219 22 228 786 164 136 912 294 644 379 186 187 296 1414 1062 428 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 Up to 1943 -57 2 -2 -54 -35 -12 -27 -35 --40 -26 -27 -29 -34 -70 -68 -21 -41 13 19 -38 -25 0 -14 -24 -29 -11 -13 -18 -23 -47 -54 -5 -40 10 5 -35 -20 -5 -5 -20 -30 -10 -10 -15 -20 -45 -45 -10 7.5 4.5 12.6 10.1 9.1 14.3 10.3 8.4 8.0 13.6 9.8 11.3 13.3 5.1 3.7 12 * United States Data compiled from U. S. Weather Bureau Records for years indicated, and Canadian data from Meteorological Service of Canada corrected to 1946. fcCol. 2. The stations followed by letters AP are airport stations, all others are city office stations and are followed by letters CO. *CoL 3. The elevations marked c are ground elevations of the station. All other elevations given are the actual elevations of the thermometer bulb above mean sea level. dCol. 4. The periods of record indicated apply only to the lowest temperature ever recorded shown in Col. 5, and generally extend from a summer month of the first year indicated through the spring months of the last year indicated. The periods marked by d terminated in December of the year indicated^ Average of readings of one lowest temperature obtained for each year. 1 It should be noted that Col. 7 applies only to airports, as these data for city stations are not available at this time. The temperature shown is the minimum hourly out-door temperature which has been equalled or exceeded 97H per cent of the total hours in December, January and February for the period of record. -It is pointed out that in most cases the airport stations are outside of the city and these data would apply primarily to rural areas. *Col. 8 indicates the average wind velocity which occurred at temperatures the same as, and lower, than the temperatures shown in Col. 7. `Col. 9 records design temperatures in use by A.S.H.V.E. Members as reported by Chapter Secretaries for the various stations. Where these were not available the design temperatures from an ACRMA publication and various other sources have been inserted. `The wind velocities indicated in Col. 10 are repeated from the 1947 Guide with a few additions and collections where other weather data have been made available.' 1 The bulletin published by A.S.H.V.E. for annual weather data of Detroit indicates 6 as design temperature. with the use to which the building is to be put and Table 2 presents values which conform to good practice. The proper dry-bulb temperature to be maintained depends upon the relative humidity and air motion, as explained in Chapter 12. In other words, a person may feel warm or cool at the same dry-bulb temperature, depending on the relative humidity and air motion. The optimum winter effective temperature for sedentary persons, as determined at the A.S.H.V.E. Research Laboratory, is 66 deg. As explained in Chapter 12 for so-called still air conditions, a relative humidity of approximately 50 per cent is required to produce an effective temperature of 66 deg when the dry-bulb temperature is 70 F.' However, even where provision is made for artificial humidification, the relative HPT Heating.Load 239 F ig . 1. I sotherms of W in t e r O utdoor D e s ig n T e m p e r a tu r e - humidity is seldom maintained higher than 40 per cent during the ex tremely cold weather, and where no provision is made for humidification, the relative humidity may be 20 per cent or less. Consequently, in using the figures listed in Table 2, consideration should be given to the actual relative humidity to be maintained if provision is to be made for humi dification.