Minimum Temperatures in Various Wind Speed Ranges

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Technical Note (National Research Council of Canada. Division of Building Research), 1954-07-01

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Minimum Temperatures in Various Wind Speed Ranges

Boyd, D. W.

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DIVISION OF BUILDING RESEARCH

NATIONAL RESEARCH COUNCIL OF CANADA

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_{1HI N ][ CAlL}

NOTE

No.

178

NOT FOR PUBLICATION FOR INTERNAL USE

PREPARED BY D. W. Boyd CHECKED BY APPROVED BY

PREPARED FOR Inquiry reply. MI§.. July

1954

SUBJECT Minimum temperatures in various wind speed ranges.

This Note contains information on certain minimum

tempera-ｴｾ･ data obtained by the Meteorological Division, Department of

Transport, in answer to an inquiry from the ReAP. The following data

and comments are of special interest to the Division of Building

Research as they are closely related to building design in the North.

Records from the following stations were analysed: Watson

Lake, Yukon; Fort Nelson, B.C.; McMurray, Alta.; The Pas, Man.; Churchill, Man.; Trout Lake, Ont.; Armstrong, Ont.; Great Whale River, P.Q.; Knob Lake, P.Q.; Nitchequon, P.Q.; Goose Bay, Labrador; and Cape Harrison, Labrador.

The following table gives the minimum temperatures iD

degrees Fahrenheit for various wind speeds in m.p.h. TABLE I

MINIMUM TEMPERATURES

(in OF for various wind speeds in m.p.h.)

0-9

10-19

20-29

30-39

40

and up

Watson Lake, Yukon

_-60

_-29

_-15

Fort Nelson, B.C.

_-47

_-38

_-19

---McMurray, Alta.

_-57

_-35

_-12

_34-

---The Pas, Man.

_-46

_-42

_-30

_-21

Churchill, Man.

_-46

:tti

-41

-40

-23

Trout Lake, ant.

_-48

_-28

ｾＱＹ

Armstrong, Ont.

_-57

_-41

_-26

_-21

₁₆

Great Whale River, Que.

_-50

_-45

_-36

_-25

_-9

Knob Lake, Que.

_-58

_-43

_-38

_-25

_-16

Nitchequon, ｾｵ･Ｎ

_-55

_-42

_-32

_-25

₈

Goose Bay, Lab.

_-32

_-31

_-30

_-17

_-3

Cape Harrison, Lab.

_-21

_-23

_-24

_-25

_-17

Ｎｾ

For most of the stations the hourly reports for January,

FebruarY', March, and December for five Y'ears

(1949-1953)

were

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2

-each of the ranges 0 to 9, 10 to 19, 20 to 29, 30 to 39, and 40

m.p.h. and up, was found. For a tew stations only six- or

three-hourly reports were available.

The minimwn temperatures are plotted in Fig. 1. In

general, the lowest temperatures occur with light winds. This is

most noticeable at Watson Lake, McMurray, Armstrong, Hitchequon, and

Knob Lake. At tour of the stations, Fort Nelson, The Pas, Trout

Lake, and Great Whale River there 1s less difterence between th..

minimum temperatures at 0 to 9 and 10 to 19 m.p.h. but much higher

minima occur with stronger winds. At Cape Ha:rrison, Goose Bay, and

Churchill the minima remain remarkably constant until quite strong

winds are reached. It must be remembered that the strong winds are

less trequent, and therefore there is a much smaller sample from

which to obtain a minLmum temperature at these high speeds. This

tact tends to cause a rapid increase in the slopes of the curves at

higher speeds. It may also account tor the steep slope between

10 to 19 and 20 to 29 m.p.h. at such stations as Fort Nelson and

Trout Lake.

Although the accuracy ot _{these curves may be questioned}

because of the short period of records (tive winters), the coarse wind speed ranges, and the unequal sampling, nevertheless they show

that the wind velocity occurring at low temperatures can varY'

widely from one location to another in the North of Canada. This

is of considerable importance in establishing conditions for

calculation of heat losses from buildings. At Watson Lake, fo:r

example, the most severe condition tor heating may well be 60 below zero and calm, while at Churchill, where the minimum temperature is

only

46

below, one must also consider a 40 below zero temperature

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I

I I I

/

, 404 up 30-.39 M.P. H.

----_

..- . 20-'29 RANGE.... IN 10- 19 \V I N C7 S PE.. E..D CAPE. ...-ＧＭＢＭｾｾＺＺＧｾ｟ｊｓｏｎ .•,., " - " I ｇｏｏｾｦＮＮ e.AY .. - - - : - - - 4 , / / ｾＮＮＮ J..

-'20

o

-50 30 10 z - -TO :E-.30 :J ｾ 2 ｾ -40 u.. o

FIG UR E.. 1 GRAPI-l S 1-10 \\1\ N G RE.-L AT \ 0 N S1-1\ P BE..T \'1 E.. E..N

_M_I_N_tM_U_M_ _T_E.._M_PE..RATU RE,... AND \V \ N 0 _'5

P

_{E... E...}_{D •}