266 BOTANICAL GAZETTE [APRIL 
and northwestern part of the state the mean annual range is greatest. 
There is a decrease in the range with an increase of altitude. The 
annual march of temperature for typical localities is shown in fig. 7- 
For most stations in the state January is the coldest month, July 
the warmest. 
TABLE IV 
MEAN ANNUAL RANGE OF TEMPERATURE 
Locality Coldest Mean Warmest Mean Mean annual 
month temperature month temperature range 
Remnants Se 
Blaine 3. ee February 31.6 July 76.2 44.6 
DIE emo es ‘ebruary 30.7 August 79-7 — 
Breckenridge........... Janu s.4 August S35 38.1 
Caton City s.5 6c cee January 3.7 July 73-0 39-3 
Castle Rock <j... 7cccs: Janu 26.6 July 68.3 41-7 
Cheyente ios. as January 25.6 July 67.4 41.8 
Collbran. isp Janu 22.0 July 68.8 46.8 
Colorado Springs........ January 49.5 July 68.0 40-5 
MONE ee pee ‘ebruary py dee A August 74-9 47:5 
‘ eve. Gee aos CE oe anuary 29.1 July 71.8 42.7 
Dove Un Unga Gem tne e January 24.5 July 68.7 44-2 
Fort Collins heater ar bet ‘ebruary | ” 26.1 July 68.5 42.4 
Port Morgaticc.. cscs anuary 25.0 July 72.8 47-8 
a Hnareen es Caner ap anuary 14.2 July 61.1 40.9 
Grand Junction......... anuary 24.7 July 79.2 54-5 
( ee — 5 ge eaeh eae January 23.9 July 72.9 49-0 
TSUSON: 5 January 9.3 July 60.9 53-6 
] egg Sone ae omar ‘ebruary 26.1 July 67.1 4t-8 
SigeuNe. co 65 aa ee january 29.9 July 70.5 40.6 
Idaho Springs........... January | 27.4 | July 62.2 348 
Lake Moraine.......... ‘ebruary 20.4 August e455 33: 
PANN ooo east esas we eS anuary aE A. July a7 5 40- I 
bas Anise oo 8 anuary 26.4 July 76.9 50-5 
CeO eu ee ed January 18.1 July 67.3 49-2 
BEOY i ek ee *ebrua: 25.4 August 41.5 46.1 
ReneS ce a January 26.3 July ~- 66.0 39-7 
féeker. oo Ss é anuary 19.6 July 65 9 46.3 
WO ice a January 19.4 July 63.9 44-5 
MIBDIO. soe ee: anuary 29.1 July 74.2 45-1 
Fs een eee Janu 13.9 July 70.2 56-3 
weky Ford... i. os cs. January 28.9 July 74.3 45-4 
ie ee ea ee ste anuary oli July mg - 2 
ps iv eye ee Janua: 19. ul 2 
Vest Clits eteeaes eens 4 anny ie - 130 6r. 36-8 
WHY ee ‘ebruary 28.9 July 73-7 
The diurnal range of temperature is great over the entire state- 
This is especially so on the plains, in the western part of the state, aD 
in the parks. It is least in the higher mountain regions. 
The high annual and diurnal ranges of temperature on the plains 
and other treeless areas of the state must receive no little consideration 
