CALISTOGA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(041312) CALISTOGA
From Year=1906 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	251	313	441	523	696	856	1024	984	874	714	411	237	7324
40 S	251	564	1005	1528	2224	3079	4103	5087	5962	6676	7086	7324	7324
45 M	118	183	289	373	541	706	869	829	724	559	266	112	5568
45 S	118	301	589	963	1503	2209	3078	3907	4632	5191	5456	5568	5568
50 M	35	81	152	230	386	556	714	674	574	404	140	33	3980
50 S	35	116	269	499	885	1441	2155	2829	3403	3807	3947	3980	3980
55 M	6	24	58	112	237	406	559	519	425	256	53	5	2660
55 S	6	30	88	200	437	844	1403	1922	2346	2602	2655	2660	2660
60 M	1	4	15	41	118	261	404	364	277	129	13	1	1626
60 S	1	5	19	60	178	439	843	1207	1484	1613	1626	1626	1626

Corn Growing Degree Days
50 M	153	200	280	341	449	530	612	589	536	461	262	139	4553
50 S	153	353	634	975	1424	1954	2566	3155	3691	4151	4414	4553	4553

M = Monthly Data
S - Running sum of monthly data.
Growing Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. This is done for each day of the month and summed.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu