SONOMA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(048351) SONOMA
From Year=1952 To Year=2005
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	228	319	420	497	666	811	934	924	840	689	396	234	6958
40 S	228	547	968	1464	2130	2941	3875	4799	5639	6328	6724	6958	6958
45 M	103	183	267	347	511	661	779	769	690	534	249	108	5200
45 S	103	285	552	899	1410	2071	2850	3619	4309	4843	5092	5200	5200
50 M	30	73	132	204	356	511	624	614	540	379	123	33	3619
50 S	30	103	235	439	796	1306	1931	2545	3084	3464	3587	3619	3619
55 M	5	17	44	91	208	361	469	459	390	229	40	5	2319
55 S	5	21	65	157	365	726	1196	1655	2044	2274	2314	2319	2319
60 M	0	2	8	29	94	218	315	304	242	103	7	0	1322
60 S	0	2	10	39	133	351	665	970	1212	1315	1322	1322	1322

Corn Growing Degree Days
50 M	120	188	261	322	420	498	570	565	521	446	243	126	4278
50 S	120	307	568	890	1310	1808	2378	2942	3463	3909	4152	4278	4278

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 Apr 5, 2006
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