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Local Climate in the Ottawa Region: 1955 Boyd, D

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Local Climate in the Ottawa Region: 1955 Boyd, D NRC Publications Archive Archives des publications du CNRC Local climate in the Ottawa region: 1955 Boyd, D. W. For the publisher’s version, please access the DOI link below./ Pour consulter la version de l’éditeur, utilisez le lien DOI ci-dessous. Publisher’s version / Version de l'éditeur: https://doi.org/10.4224/20338203 Internal Report (National Research Council of Canada. Division of Building Research), 1957-07-01 NRC Publications Archive Record / Notice des Archives des publications du CNRC : https://nrc-publications.canada.ca/eng/view/object/?id=04a2e428-41c2-4969-8cf8-950eec1da84d https://publications-cnrc.canada.ca/fra/voir/objet/?id=04a2e428-41c2-4969-8cf8-950eec1da84d Access and use of this website and the material on it are subject to the Terms and Conditions set forth at https://nrc-publications.canada.ca/eng/copyright READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE. L’accès à ce site Web et l’utilisation de son contenu sont assujettis aux conditions présentées dans le site https://publications-cnrc.canada.ca/fra/droits LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D’UTILISER CE SITE WEB. Questions? Contact the NRC Publications Archive team at [email protected]. If you wish to email the authors directly, please see the first page of the publication for their contact information. Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n’arrivez pas à les repérer, communiquez avec nous à [email protected]. NATIONAL RESEARCH COUNCIL OF CANADA DIVISIOll OF BUILDING RESEARCH LOCAL OLIMATE IN THE OTTAWA REGION:1955 by D. W. Boyd Report No. 125 of the D1vision of Building Research Ottawa July 1957 50' 40' WEATHER STATiONS IN THE OTTAWA REGION • PRECIPITATION ONLY • PRECIPITATION a TEMP. I N.R.C. 6 GATINEAU 10 BECKWITH 2 ROCKCLIFFE 7 LONG ISLAND II LA SALLE 3 AIRPORT 8 MANOTICK 12 LEMIEUX IS. 4 EXP. FARM 9 ORLEANS 13 SHIRLEY BAY 5 CITY VIEW 14 BAYVIEW 30"1-----------1----'\-1<;\------ 20'H------------t ＭＫＭＭＭＭＭＭＭ｜ＭＭＭＭＭＭＭＱｈＭＭｉｄＬＬﾣＭＭＫＭｾＭＭＭ｜Ｎ｟｟ＭＭＭＭＭＭｈ 20' o I 2 3 4 5 MILES 50' 40' D.B.R INT. RPT. NO. 125 PREFACE This report is a further record of the detailed studies being made of the climate of the Ottawa region by the Division of Building Research in connection with its over-all investigation of climate in relation to building. The author, Donald W. Boyd, serves as full-time climatologist to the Division being seconded to this post from his official position with the Meteorological Branch of the Department of Transport by kind permission of Mr. Andrew Thomson, Director. This very close liaison is a continuing source of satisfaction to the Division of Building Research. The Division is most grateful to the volunteer observers in the Ottawa district whose work has made the preparation of this report possible. It is hoped that when they see this record of the consolidated results, they will feel encouraged and realize that their ovm individual observations are greatly assisting in the development of a clear picture of the climate of the Ottawa region. Ottawa July 1957 R. F. Legget, Director. LOCAL ｃｌｉｮｾｔｅ IN THE OTTAWA REGION: 1955 by Donald W. Boyd This is the fourth of a series of annual reports based on weather observations in and near the City of Ottawa. During these years the number of precipitation observing stations in. the region has increased. In the first ｾｶｯ reports (DBR Reports S-36 and R. ,,46) for 1952 and 1953 there were only four precipi­ tation stations; by 1954 (DBR Report No. 70) the number had jumped to eleven, and in the present report thirteen stations are included. The same is not true for temperature observations. Since 1952 there have been four stations observing maximum and minimum temperatures in standard Stevenson screens. Values for a fifth station observing only hourly temperatures in a small screen on the side of a bUilding were included in last year's report and in the present one. Reliable wind observations in 1955 are available only from the two airports. The anemometer at the N.R.C. station was not operating satisfactorily and even for those months when the reports were complete the observations are suspected of being biased. The locations of the observing stations are indicated on the map. Some notes about their names, observers and exposures are contained in the appendiX. Each part of this report deals with a single weather element and is based on the observations taken at all those stations the records of which are complete or nearly complete. It is difficult to use incomplete records because some estimate must be made for the missing data. One day or one month can- ll not be just 1l1eft out , because averaging the remaining data is the same as assuming that the missing value was the same as the average. A better estimate can usually be made by the obser­ ver. Since 1953 the Climatological Division has been using normal temperature and precipitation values based on the standard thirty-year period from 1921 to 1950. As mentioned in Report No. 70 for 1954, the only station in the Ottawa region with observations throughout this period is the Central Experi­ mental Farm. As in the reports for the last two years the temperature and precipitation observations at the Farm for the current year are compared with the standard normal values at - 2 - the same station, as an indication of hor: 1955 departed from normal. The best wind records in this region are for Ottawa Airport. All the observations from 1939 to 1954 inclusive have been averaged to give the sixteen-year normal values. PART OIrE : TEMPERATURE At four of the weather stations in Ottawa the maximum and minimum thermometers are read and reset at least twice a day, at 0730 and 1930 E. S. T., or as close to these times as is practical. The minimum temperature reported for the day is the lower of the two (or the lowest of four) readings taken on that calendar day. In other words, it is the lowest tem­ perature in the 24-hour period ending at the time of the evening observation. The maximum temperature reported for the day is the higher of the readings taken in the evening and the next morning (or the highest of four readings ending with the one at 0730 E.S.T.'. Thus it is the highest temperature in the 24-hour period which does not end until the time of the obser­ vation the following morning. At Bayview the actual temperature is read once each hour. The daily minimum temperature is the lowest of the 25 readings ending with the one at 2000 E.S.T. The daily maximum is the highest of the 25 readings ending with the one at 0800 E.S.T. the following day. Extreme Temperatures Temperature records from all the stations at Ottawa (including some which are now closed but whose observations go back as far as 1872) have :been searched for the highest and lowest temperatures ever reported in each month. These record extremes are tabulated in the first and last lines of Table I. The rest of Table I is based entirely on the daily maximum and minimum temperatures observed in 1955. Four values are tabulated for each station and for each month. The first and last .groups, the monthly maxima and the monthly minima, are respectively, the highest of the daily maxima and the lowest of the daily minima in each month. The second and third groups, the mean daily maxima and the mean daily minima are the averages for the month of the daily maxima and minima res­ pectively. No new record monthly maxima or minima were established or equalled in 1955, although the maxima at Rockcliffe and Bayview in July and August and the Experimental Farm in August all came within one degree of the previous records. The minima were all at least six degrees above the previous records. - 3 - Mean Temperatures The mean temperature for a day is often defined as the average of the maximum and minimum. Hence the monthly mean temperatures are the averages of the monthly mean daily maxima and minima. These monthly means for 1955 are shown in Table II. Since the values for Bayview were obtained in a different way, they have not been used in computing the average for the region of the monthly mean temperatures. The second section of Table II lists the differences between the mean temperatures for the individual stations and the average mean temperatures for the region in 1955. Rockcliffe temperatures were above the average in every month, and N.R.C.'s, average or above. The Experimental Farm and the Airport were below the average throughout the year. With the exception of Rockcliffe in 1mrch, none of the differences was more than one degree. The differences from the average for the year as a whole for these four stations are tabulated below with similar values taken from the reports for the three previous years: 1952 1953 1954 1955 Average N.R.C. 0.3 0.2 0.4 0.2 0.3 Rockc1iffe 0.5 0.5 0.7 0.8 0.6 Airport -0.5 -0.3 -0.6 -0.4 -0.5 Exp. Farm -0.3 -0.3 -0.4 -0.6 -0.4 These differences are all small, averaging less than half a degree. However, their consistency from year to year indicates that they represent a real difference in the local climate of the region.
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