'Military report on Tehran and adjacent Provinces of North-West Persia (including the Caspian Littoral)' [‎89r] (182/610)

!5°iteo«i found at its best in the Elburz valleys, between 6,500' and
riMtol 7,500', which in August have a range of temperature between
laiati® about 50° and 75°. It is at its worst in the lowlying Kizil
Uzun and Shahrud valleys. The effect of the North wind
cease to be felt a short distance above Manjil and from this
0 "" point the heat in the valleys becomes intense and these
“qishlaq” are semi-deserted in summer. The Kizil Uzun
itmospk, valley is unpleasantly hot as far as Garrus and the Shahrud
salthy, area to 20 miles above the junction of the Alamut and
[den to® Talaghan rivers.
summer to The coldest period of winter is from 21st December to /th
February, when frost and snow are due, their amount, duration
iland (coi' an d severity depending on the altitude. It is impossible to li\ e
in tents at this season and the heating of houses is unsatis
factory An East India Company trading post. and expensive owing to the scarcity of fuel.
The transition from spring to summer at* Tehran is efiected
Ki tted- very quickly some time between the 15th May and loth June,
altitude. aQ( j f rom gunxmer to autumn still more suddenly in Septem er,
i th eonlj which is cooler than June, and has the greatest difference between
irailabfe. day and night temperatures. Winter begins about the
but the November. The climate in spring and autumn is delightful
>rence to but the city is very dusty until the first rains,
ature f The obgerva ti 0 ns show an extreme range of temperatures
esponcffi? between an average highest maximum temperature of 1U5 ^
a,®® i n j uly and an average lowest minimum temperature ext Wt)
increase. iu February _ The diurna i variation is also extreme sometimes
(f) Wo? reaching a difference of 30° to 40° between noon and 2 a.m., an
Hispracti' in summer the difference between sun and sha e o en ex
30°.
ping to
oilOd ;
very powerful. In ™m m er it is hot at e' 6 ™