Pond Evaporation Calculation													1/31/16
Weather Station Data provided by Northern Colorado Water Conservancy District
See Weather Station Location Map at:
http://www.northernwater.org/WaterConservation/WeatherandETData.aspx
Notes:
Current month reflects values through "Reference Date".
Pond Evap. calculated per recent Division 1 Water Court decree language:							Lower South Platte Home Page
Gross Pond = .84(Alfalfa ETr)							Pond Evaporation Reports Main Menu
Net Pond = .84(Alfalfa ETr) - .7(Total Precip)
Alfalfa reference ETr computed by Standard ASCE equation from daily weather data.
Winter pond evap. is a reference for unfrozen ponds.
For Growing Degree Days:
Tmax = 86° F, Tmin = 50° F and Tbase = 50° F
														Totals
Weather Station	2015	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	or Avg.
Ovid	Avg. Temp ° F	27.83	30.73	44.94	49.88	54.74	70.97	73.37	71.2	66.09	52.48	35.41	26.37	50.33
Ref date as of 12/31/2015	Total Precip "	0.33	0.43	0.33	2.52	5.59	2.14	0.77	1.5	0.75	1.1	1.24	0.48	17.18
Site Type: Alfalfa	Total Alfalfa ETr "	1.96	2.41	6.67	6.09	5.35	8.17	9.07	8.08	6.24	4.01	2.25	1.54	61.84
Total Growing Degee Days from March 1		0	0	245	216	250	610	661	613	496	284	107	28	3510
Gross Pond Evap	Total "	1.65	2.02	5.6	5.12	4.49	6.86	7.62	6.79	5.24	3.37	1.89	1.29	51.94
Net Pond Evap	Total "	1.42	1.72	5.37	3.35	0.58	5.36	7.08	5.74	4.72	2.6	1.02	0.96	39.92
Crook	Avg. Temp ° F	28.14	31.23	44.48	49.23	54.15	70.35	72.46	71.2	65.73	53.06	35.47	26.07	50.13
Ref date as of 12/31/2015	Total Precip "	0.09	0.19	0.27	5.58	5.44	1.12	1.92	2.82	0.59	1.09	1.51	0.74	21.36
Site Type: Alfalfa	Total Alfalfa ETr "	1.94	2.51	6.31	5.74	4.92	7.65	8.29	7.92	6.17	4.34	2.38	1.6	59.77
Total Growing Degee Days from March 1		0	0	243	214	240	604	647	610	505	302	114	33	3512
Gross Pond Evap	Inch	1.63	2.11	5.3	4.82	4.13	6.43	6.96	6.65	5.18	3.65	2	1.34	50.2
Net Pond Evap	Inch	1.57	1.98	5.11	0.92	0.32	5.64	5.62	4.68	4.77	2.88	0.94	0.83	35.26
Sterling	Avg. Temp ° F	26.91	31.89	44.64	49.29	54.3	71	72.94	71.55	65.87	53.08	35.23	25.67	50.2
Ref date as of 12/31/2015	Total Precip "	0.21	0.21	0.32	4.8	7.22	0.55	1.69	0.65	0.54	1.11	1.02	0.57	18.89
Site Type: Alfalfa	Total Alfalfa ETr "	1.57	2.48	6.07	5.67	5.13	8.25	8.87	8.19	6.16	4.13	2.33	1.51	60.36
Total Growing Degee Days from March 1		0	0	233	217	244	616	657	621	493	307	118	35	3541
Gross Pond Evap	Inch	1.32	2.08	5.1	4.76	4.31	6.93	7.45	6.88	5.17	3.47	1.96	1.27	50.7
Net Pond Evap	Inch	1.17	1.94	4.87	1.4	0	6.55	6.27	6.42	4.8	2.69	1.24	0.87	38.22
Brush	Avg. Temp ° F	26.72	31.81	44.49	49.03	53.47	71.04	71.57	71	65.23	52.92	34.61	24.71	49.72
Ref date as of 12/31/2015	Total Precip "	0.21	0.3	0.31	6.29	12.19	1.28	1.93	4.28	0.75	2.6	1.06	0.96	32.16
Site Type: Alfalfa	Total Alfalfa ETr "	1.44	2.42	6.23	5.96	5.1	8.96	7.91	7.95	5.91	3.85	2.28	1.31	59.32
Total Growing Degee Days from March 1		0	0	234	223	244	610	616	629	511	320	127	31	3545
Gross Pond Evap	Inch	1.21	2.03	5.23	5.01	4.28	7.53	6.64	6.68	4.96	3.23	1.92	1.1	49.82
Net Pond Evap	Inch	1.06	1.82	5.02	0.6	0	6.63	5.29	3.68	4.44	1.41	1.17	0.43	31.55
Fort Morgan	Avg. Temp ° F	27.5	32.14	44.57	49.22	53.26	70.3	71.63	71.19	65.59	53.43	35.06	24.73	49.89
Ref date as of 12/31/2015	Total Precip "	0.17	0.31	0.12	4.98	11.25	1.63	2.85	2.86	0.2	2.3	0.88	0.52	28.07
Site Type: Turf	Total Alfalfa ETr "	1.52	2.24	5.34	5.64	4.73	7.73	7.7	6.77	5.64	3.47	2.01	1.15	53.94
Total Growing Degee Days from March 1		0	0	228	227	233	599	644	631	508	311	114	22	3517
Gross Pond Evap	Inch	1.28	1.88	4.49	4.74	3.97	6.49	6.47	5.69	4.74	2.91	1.69	0.97	45.32
Net Pond Evap	Inch	1.16	1.66	4.4	1.25	0	5.35	4.47	3.68	4.6	1.3	1.07	0.6	29.54
Wiggins	Avg. Temp ° F	25.62	30	41.52	45.85	49.52	66.17	67.2	66.5	61.29	52.92	34.72	23.15	47.04
Ref date as of 12/31/2015	Total Precip "	0.25	0.31	0.1	3.24	7.33	0.92	1.17	2.39	0.12	1.46	0.7	0.68	18.67
Site Type: Alfalfa	Total Alfalfa ETr "	1.51	2.32	5.47	5.64	4.41	8.38	8.52	8.12	6.33	4.15	2.37	1.31	58.53
Total Growing Degee Days from March 1		0	0	196	184	182	484	536	538	450	314	116	19	3019
Gross Pond Evap	Inch	1.27	1.95	4.59	4.74	3.7	7.04	7.16	6.82	5.32	3.49	1.99	1.1	49.17
Net Pond Evap	Inch	1.09	1.73	4.52	2.47	0	6.4	6.34	5.15	5.23	2.46	1.5	0.62	37.51
Fort Collins East	Avg. Temp ° F	30.15	32.37	43.55	47.61	51.46	68.41	69.66	69.4	64.46	53.03	35.1	26.97	49.35
Ref date as of 12/31/2015	Total Precip "	0.19	0.49	0.23	2.07	5.53	1.82	1.77	0.79	0.18	2.12	1.34	0.6	17.13
Site Type: Alfalfa	Total Alfalfa ETr "	2.18	2.76	5.82	5.97	4.31	7.73	8.24	7.99	6.76	3.84	2.44	1.72	59.76
Total Growing Degee Days from March 1		0	0	202	180	194	536	589	583	493	279	89	32	3177
Gross Pond Evap	Inch	1.83	2.32	4.89	5.01	3.62	6.49	6.92	6.71	5.68	3.23	2.05	1.44	50.19
Net Pond Evap	Inch	1.7	1.98	4.73	3.57	0	5.22	5.68	6.16	5.55	1.74	1.11	1.02	38.46
Eaton	Avg. Temp ° F	29.18	32.39	43.69	48.08	52.34	69.39	69.67	69.23	63.83	52.62	34.22	25.28	49.16
Ref date as of 12/31/2015	Total Precip "	0.27	0.77	0.28	2.54	5.69	1.18	2.26	0.95	0.12	2.29	0.96	0.75	18.06
Site Type: Alfalfa	Total Alfalfa ETr "	1.83	2.58	5.42	6.03	4.85	8.43	8.08	7.6	6.02	3.54	2.27	1.66	58.31
Total Growing Degee Days from March 1		0	0	212	207	222	558	608	585	495	287	89	19	3282
Gross Pond Evap	Inch	1.54	2.17	4.55	5.07	4.07	7.08	6.79	6.38	5.06	2.97	1.91	1.39	48.98
Net Pond Evap	Inch	1.35	1.63	4.36	3.29	0.09	6.26	5.21	5.72	4.97	1.37	1.23	0.87	36.35
Johnsons Corner	Avg. Temp ° F	32.04	33.1	44.4	48.31	51.65	68.31	70.65	71.13	65.9	53.63	35.9	26.89	50.16
Ref date as of 12/31/2015	Total Precip "	0.27	1.33	0.27	2.28	6.29	3.73	0.43	0.75	0.07	2.07	1.52	0.74	19.75
Site Type: Alfalfa	Total Alfalfa ETr "	2.09	2.6	5.17	5.57	4.32	7.6	8.95	8.43	6.58	3.76	2.28	1.65	59
Total Growing Degee Days from March 1		0	0	200	188	196	550	610	611	499	273	78	30	3235
Gross Pond Evap	Inch	1.76	2.18	4.34	4.68	3.63	6.38	7.52	7.08	5.53	3.16	1.92	1.39	49.57
Net Pond Evap	Inch	1.57	1.25	4.15	3.08	0	3.77	7.22	6.56	5.48	1.71	0.85	0.87	36.51
Gilcrest	Avg. Temp ° F	30.91	33.09	44.85	49.52	53.23	70.17	72.13	71.49	65.99	53.34	35.08	24.04	50.32
Ref date as of 12/31/2015	Total Precip "	0.2	0.76	0.21	2.32	5.29	2.95	0.6	1.99	0.09	1.58	1.73	0.69	18.41
Site Type: Alfalfa	Total Alfalfa ETr "	1.9	2.41	5.2	5.85	4.62	8.19	8.99	8.18	6.45	3.62	2.15	1.3	58.86
Total Growing Degee Days from March 1		0	0	226	217	228	589	645	628	521	299	94	22	3469
Gross Pond Evap	Inch	1.6	2.02	4.37	4.91	3.88	6.88	7.55	6.87	5.42	3.04	1.81	1.09	49.44
Net Pond Evap	Inch	1.46	1.49	4.22	3.29	0.18	4.81	7.13	5.48	5.36	1.93	0.6	0.61	36.56
Longmont South	Avg. Temp ° F	33.55	34.14	44.85	49.08	52.18	68.8	71.28	72.02	66.85	54.39	37.01	28.27	51.04
Ref date as of 12/31/2015	Total Precip "	0.35	1.42	0.41	3.29	6.33	1.15	0.86	0.68	0.12	1.98	1.82	0.77	19.18
Site Type: Alfalfa	Total Alfalfa ETr "	2.48	2.92	5.19	5.51	4.41	7.57	8.32	8.63	6.9	3.86	2.5	1.83	60.12
Total Growing Degee Days from March 1		0	0	195	193	204	537	612	616	515	282	98	35	3287
Gross Pond Evap	Inch	2.08	2.45	4.36	4.63	3.7	6.36	6.99	7.25	5.8	3.24	2.1	1.54	50.5
Net Pond Evap	Inch	1.84	1.46	4.07	2.33	0	5.55	6.39	6.77	5.71	1.86	0.83	1	37.81
Fort Collins NW	Avg. Temp ° F	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Ref date as of 12/31/2010	Total Precip "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Site Type: Turf	Total Alfalfa ETr "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Total Growing Degee Days from March 1		0	0	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Gross Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Net Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Fort Collins Central	Avg. Temp ° F	32.77	34.12	44.64	49.2	52.64	69.65	70.66	70.64	65.24	53.45	34.56	27.34	50.41
Ref date as of 12/31/2015	Total Precip "	0.14	0.7	0.1	3.15	6.08	1.69	1.42	0.94	0.16	1.96	0.73	0.46	17.53
Site Type: Turf	Total Alfalfa ETr "	1.87	2.28	4.52	5.05	4.03	6.9	6.87	6.38	5.04	2.8	1.93	1.49	49.16
Total Growing Degee Days from March 1		0	0	214	198	210	556	610	603	512	295	90	34	3322
Gross Pond Evap	Inch	1.57	1.92	3.8	4.24	3.39	5.8	5.77	5.36	4.23	2.35	1.62	1.25	41.3
Net Pond Evap	Inch	1.47	1.43	3.73	2.04	0	4.61	4.78	4.7	4.12	0.98	1.11	0.93	29.9
Windsor	Avg. Temp ° F	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Ref date as of 7/1/2012	Total Precip "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Site Type: Dryland Pasture	Total Alfalfa ETr "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Total Growing Degee Days from March 1		0	0	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Gross Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Net Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Greeley West	Avg. Temp ° F	30.1	33.32	45.06	49.1	52.84	70.28	72	71.89	66.41	53.78	35.02	25.55	50.45
Ref date as of 12/31/2015	Total Precip "	0.27	0.89	0.3	2.56	5.24	1.89	0.86	0.75	0.14	1.97	1.48	0.84	17.19
Site Type: Turf	Total Alfalfa ETr "	1.66	2.27	4.85	5.38	4.46	7.5	8.09	7.28	5.83	3.34	1.92	1.37	53.95
Total Growing Degee Days from March 1		0	0	224	207	218	592	651	630	531	304	89	24	3470
Gross Pond Evap	Inch	1.39	1.91	4.07	4.52	3.75	6.3	6.8	6.12	4.9	2.81	1.61	1.15	45.33
Net Pond Evap	Inch	1.21	1.28	3.86	2.73	0.08	4.98	6.19	5.59	4.8	1.43	0.58	0.56	33.29
Loveland	Avg. Temp ° F	31.63	33.8	44.65	49.53	53.01	70.22	71.61	71.62	66.44	54.24	36.47	28.14	50.95
Ref date as of 12/31/2015	Total Precip "	0.36	1	0.29	2.29	6.18	2.57	0.99	1.17	0.03	2.22	1.13	0.64	18.87
Site Type: Turf	Total Alfalfa ETr "	1.75	2.34	4.5	5.04	4.1	6.92	7.32	6.64	5.5	3.22	2.06	1.55	50.94
Total Growing Degee Days from March 1		0	0	232	226	238	604	641	635	543	314	116	34	3583
Gross Pond Evap	Inch	1.47	1.97	3.78	4.23	3.44	5.81	6.15	5.58	4.62	2.7	1.73	1.3	42.78
Net Pond Evap	Inch	1.22	1.27	3.58	2.63	0	4.01	5.46	4.76	4.6	1.15	0.94	0.85	30.47
Berthoud	Avg. Temp ° F	32.71	33.67	44.92	48.61	51.64	68.89	71.25	71.59	66.75	54.51	37.06	28.47	50.84
Ref date as of 12/31/2015	Total Precip "	0.19	1.11	0.28	2.88	6.97	2.35	0.34	0.96	0.05	1.74	1.53	0.7	19.1
Site Type: Turf	Total Alfalfa ETr "	1.97	2.44	4.75	5.22	4.23	7.38	8.52	7.74	6.15	3.61	2.28	1.58	55.87
Total Growing Degee Days from March 1		0	0	199	191	194	566	634	628	520	273	85	30	3320
Gross Pond Evap	Inch	1.65	2.05	3.99	4.38	3.55	6.2	7.16	6.5	5.17	3.03	1.92	1.33	46.93
Net Pond Evap	Inch	1.52	1.27	3.79	2.37	0	4.55	6.92	5.83	5.13	1.81	0.84	0.84	34.87
Longmont West	Avg. Temp ° F	32.65	34.15	44.36	48.94	51.94	68.92	70.91	71.51	66.67	54	36.79	29.02	50.82
Ref date as of 12/31/2015	Total Precip "	0.12	0.75	0.26	2.48	5.49	1.58	0.79	0.47	0.34	1.88	1.63	0.34	16.13
Site Type: Turf	Total Alfalfa ETr "	1.78	2.25	4.27	4.83	4.07	6.57	7.17	6.56	5.03	2.82	1.86	1.35	48.56
Total Growing Degee Days from March 1		0	0	188	183	194	550	623	628	523	283	93	38	3303
Gross Pond Evap	Inch	1.5	1.89	3.59	4.06	3.42	5.52	6.02	5.51	4.23	2.37	1.56	1.13	40.8
Net Pond Evap	Inch	1.41	1.37	3.4	2.32	0	4.41	5.47	5.18	3.99	1.05	0.42	0.9	29.92
Fort Lupton	Avg. Temp ° F	32.51	33.97	45.14	49.25	52.8	69.62	71.83	72.53	67.54	55.16	36.99	27.44	51.23
Ref date as of 12/31/2015	Total Precip "	0.29	1.21	0.68	2.47	5.45	2.07	1.02	0.54	0.32	1.17	2.38	0.93	18.53
Site Type: Turf	Total Alfalfa ETr "	2.12	2.48	4.95	5.66	4.81	7.99	8.55	8.53	6.8	3.97	2.42	1.61	59.89
Total Growing Degee Days from March 1		0	0	208	207	221	576	651	644	545	308	104	30	3494
Gross Pond Evap	Inch	1.78	2.08	4.16	4.75	4.04	6.71	7.18	7.17	5.71	3.33	2.03	1.35	50.29
Net Pond Evap	Inch	1.58	1.24	3.68	3.03	0.23	5.26	6.47	6.79	5.49	2.52	0.37	0.7	37.36
Boulder NW	Avg. Temp ° F	35.72	34.83	45.59	48.94	52.15	69.14	71.09	71.96	67.74	54.69	38.29	30.98	51.76
Ref date as of 12/31/2015	Total Precip "	0.22	2.1	0.57	3.62	6.15	1.63	2.58	0.42	0.33	2	1.43	0.54	21.59
Site Type: Turf	Total Alfalfa ETr "	2.21	2.41	4.62	4.71	4.11	7.14	7.41	7.21	6.09	3.36	2.34	1.87	53.48
Total Growing Degee Days from March 1		0	0	201	203	204	547	629	630	538	277	98	43	3370
Gross Pond Evap	Inch	1.86	2.02	3.88	3.96	3.45	6	6.22	6.06	5.12	2.82	1.97	1.57	44.93
Net Pond Evap	Inch	1.7	0.55	3.48	1.42	0	4.86	4.42	5.76	4.88	1.42	0.96	1.19	30.64
Boulder East	Avg. Temp ° F	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Ref date as of 5/2/2010	Total Precip "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Site Type: Turf	Total Alfalfa ETr "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Total Growing Degee Days from March 1		0	0	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Gross Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Net Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Boulder Flatiron	Avg. Temp ° F	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Ref date as of 5/2/2010	Total Precip "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Site Type: Turf	Total Alfalfa ETr "	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Total Growing Degee Days from March 1		0	0	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Gross Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Net Pond Evap	Inch	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	#N/A	0
Boulder SW	Avg. Temp ° F	37.14	36.25	46.73	49.42	52.02	68.9	71.08	71.98	68.31	55.79	39.93	33.56	52.59
Ref date as of 12/31/2015	Total Precip "	0.46	1.69	0.64	4.07	6.35	2.24	2.38	0.38	0.15	2.05	1.23	0.29	21.93
Site Type: Turf	Total Alfalfa ETr "	2.46	2.59	4.82	4.96	4.14	7.05	7.2	7.46	6.44	3.63	2.69	2.13	55.57
Total Growing Degee Days from March 1		0	0	176	169	181	557	621	626	518	261	88	45	3242
Gross Pond Evap	Inch	2.07	2.18	4.05	4.17	3.48	5.92	6.05	6.27	5.41	3.05	2.26	1.79	46.7
Net Pond Evap	Inch	1.74	0.99	3.6	1.32	0	4.35	4.38	6	5.3	1.61	1.4	1.59	32.28
Greeley04	Avg. Temp ° F	27.76	32.33	43.91	48.65	52.79	69.71	71.42	70.63	65.23	53.3	34.48	24.15	49.53
Ref date as of 12/31/2015	Total Precip "	0.1	0.16	0.13	2.48	5.22	2.24	0.9	0.75	0.07	1.25	1.1	0.2	14.6
Site Type: Fully irrigated	Total Alfalfa ETr "	1.93	2.77	5.78	6.3	4.58	8.37	9.54	6.87	6.47	3.97	2.35	1.69	60.62
Total Growing Degee Days from March 1		0	0	230	214	214	577	634	618	513	314	91	18	3423
Gross Pond Evap	Inch	1.62	2.33	4.86	5.29	3.85	7.03	8.01	5.77	5.43	3.33	1.97	1.42	50.91
Net Pond Evap	Inch	1.55	2.21	4.76	3.56	0.19	5.46	7.38	5.25	5.39	2.46	1.2	1.28	40.69