Pond Evaporation Calculation													12/31/15
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	2014	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	or Avg.
Ovid	Avg. Temp ° F	29.49	19.95	37.62	49.24	58.3	67.71	72.31	71.14	63.29	51.79	31.74	25.16	48.15
Ref date as of 12/31/2014	Total Precip "	0.5	1.11	0.49	0.68	2	5.39	0.53	1.89	1.28	0.8	0.41	0.48	15.56
Site Type: Alfalfa	Total Alfalfa ETr "	2.99	1.64	4.35	7.24	7.68	8.57	8.88	7.62	6.08	4.9	2.38	1.44	63.77
Total Growing Degee Days from March 1		0	0	127	227	380	516	650	640	442	310	84	43	3419
Gross Pond Evap	Total "	2.51	1.38	3.65	6.08	6.45	7.2	7.46	6.4	5.11	4.12	2	1.21	53.57
Net Pond Evap	Total "	2.16	0.6	3.31	5.61	5.05	3.43	7.09	5.08	4.21	3.56	1.71	0.87	42.68
Crook	Avg. Temp ° F	28.73	19.8	37.76	48.85	57.6	66.67	72.37	70.33	62.59	51.4	31.52	24.29	47.66
Ref date as of 12/31/2014	Total Precip "	0.43	0.72	0.46	0.61	2.54	4.37	1.37	3.58	2.95	0.42	0.43	0.63	18.51
Site Type: Alfalfa	Total Alfalfa ETr "	2.76	1.54	4.34	6.9	7.31	8.55	8.66	7.09	5.66	4.55	2.29	1.37	61.02
Total Growing Degee Days from March 1		0	0	126	221	365	500	640	618	436	314	88	44	3352
Gross Pond Evap	Inch	2.32	1.29	3.65	5.8	6.14	7.18	7.27	5.96	4.75	3.82	1.92	1.15	51.25
Net Pond Evap	Inch	2.02	0.79	3.32	5.37	4.36	4.12	6.32	3.45	2.69	3.53	1.62	0.71	38.3
Sterling	Avg. Temp ° F	28.73	21.3	39.2	49.41	58.21	67.41	72.47	70.16	62.4	51.64	31.59	23.72	48.02
Ref date as of 12/31/2014	Total Precip "	0.67	0.5	0.59	2.12	1.97	3.87	4.39	2.46	1.23	0.41	0.44	0.95	19.6
Site Type: Alfalfa	Total Alfalfa ETr "	2.6	1.6	4.52	6.82	7.2	8.67	8.47	7.12	5.68	4.52	2.18	1.3	60.68
Total Growing Degee Days from March 1		0	0	139	222	364	524	651	622	438	329	93	41	3423
Gross Pond Evap	Inch	2.18	1.34	3.8	5.73	6.05	7.28	7.11	5.98	4.77	3.8	1.83	1.09	50.96
Net Pond Evap	Inch	1.72	0.99	3.38	4.24	4.67	4.57	4.04	4.26	3.91	3.51	1.52	0.43	37.24
Brush	Avg. Temp ° F	26.95	22.49	39.57	49.6	57.66	67.11	71.9	68.69	62.06	51.62	31.46	23.04	47.68
Ref date as of 12/31/2014	Total Precip "	0.89	0.4	0.64	1.39	3.4	5.04	1.96	4.74	1.5	0.47	0.86	0.57	21.86
Site Type: Alfalfa	Total Alfalfa ETr "	2.2	1.81	4.68	6.93	7.2	8.77	7.97	6.7	5.58	4.55	2.16	1.24	59.79
Total Growing Degee Days from March 1		0	0	151	224	360	519	641	596	435	323	96	33	3378
Gross Pond Evap	Inch	1.85	1.52	3.93	5.82	6.05	7.37	6.69	5.63	4.69	3.82	1.81	1.04	50.22
Net Pond Evap	Inch	1.23	1.24	3.48	4.85	3.67	3.84	5.32	2.31	3.64	3.49	1.21	0.64	34.92
Fort Morgan	Avg. Temp ° F	26.58	22.08	38.64	49.01	57.36	66.56	72.06	69.37	62.51	51.81	31.82	23.83	47.64
Ref date as of 12/31/2014	Total Precip "	0.74	0.33	0.58	1.31	2.44	6.01	2.01	5.19	2.68	0.73	0.98	0.61	23.61
Site Type: Turf	Total Alfalfa ETr "	1.92	1.7	4.09	6.18	6.9	8.19	8.19	6.8	5.34	3.99	1.98	1.11	56.39
Total Growing Degee Days from March 1		0	0	136	212	356	508	644	604	442	317	96	33	3348
Gross Pond Evap	Inch	1.61	1.43	3.44	5.19	5.8	6.88	6.88	5.71	4.49	3.35	1.66	0.93	47.37
Net Pond Evap	Inch	1.09	1.2	3.03	4.27	4.09	2.67	5.47	2.08	2.61	2.84	0.98	0.51	30.84
Wiggins	Avg. Temp ° F	25.97	21.78	38.38	48.5	56.92	65.72	70.23	67.5	60.92	49.88	29.61	21.85	46.44
Ref date as of 12/31/2014	Total Precip "	0.47	0.33	0.64	1.04	2.29	2	2.52	3.51	1.29	0.71	0.65	0.47	15.92
Site Type: Alfalfa	Total Alfalfa ETr "	2.05	1.77	4.44	6.66	6.75	8.42	7.69	6.98	5.59	4.22	2.06	1.17	57.8
Total Growing Degee Days from March 1		0	0	134	212	345	492	603	563	424	300	77	29	3179
Gross Pond Evap	Inch	1.72	1.49	3.73	5.59	5.67	7.07	6.46	5.86	4.7	3.54	1.73	0.98	48.54
Net Pond Evap	Inch	1.39	1.26	3.28	4.87	4.07	5.67	4.7	3.41	3.79	3.05	1.28	0.65	37.42
Fort Collins East	Avg. Temp ° F	28.15	24.45	38.47	47.77	55.34	64.84	69.74	67.03	60.52	50.94	32.69	26.83	47.23
Ref date as of 12/31/2014	Total Precip "	0.77	0.31	1.24	0.28	2.92	3.2	3.28	0.71	1	1.67	0.55	0.42	16.35
Site Type: Alfalfa	Total Alfalfa ETr "	2.55	2.22	4.75	6.91	6.83	8.79	7.83	7.07	5.54	4.57	2.42	1.99	61.47
Total Growing Degee Days from March 1		0	0	114	193	301	472	594	545	401	287	94	44	3045
Gross Pond Evap	Inch	2.14	1.86	3.99	5.8	5.74	7.38	6.58	5.94	4.65	3.84	2.03	1.67	51.62
Net Pond Evap	Inch	1.6	1.65	3.12	5.61	3.69	5.14	4.28	5.44	3.95	2.67	1.65	1.38	40.18
Eaton	Avg. Temp ° F	27.15	22.24	38.04	47.94	55.95	65.23	69.85	67.55	61.11	51.51	32.4	26.24	47.1
Ref date as of 12/31/2014	Total Precip "	0.83	0.25	0.91	0.3	2.81	2.48	3.64	0.92	1.12	0.57	0.78	0.58	15.19
Site Type: Alfalfa	Total Alfalfa ETr "	2.27	1.73	4.39	6.91	6.92	8.58	7.4	6.71	5.43	4.35	2.28	1.69	58.66
Total Growing Degee Days from March 1		0	0	116	208	325	481	604	568	426	309	94	42	3173
Gross Pond Evap	Inch	1.91	1.45	3.69	5.8	5.81	7.21	6.22	5.64	4.56	3.65	1.92	1.42	49.28
Net Pond Evap	Inch	1.33	1.28	3.05	5.59	3.85	5.47	3.67	4.99	3.78	3.26	1.37	1.01	38.65
Johnsons Corner	Avg. Temp ° F	27.82	25.11	39.3	48.54	56.04	65.4	70.78	68.06	61.68	52.89	33.45	28.36	48.12
Ref date as of 12/31/2014	Total Precip "	1.34	0.34	1.1	0.58	4.3	0.63	2.72	0.73	0.94	0.74	1	0.64	15.06
Site Type: Alfalfa	Total Alfalfa ETr "	1.99	2.17	4.67	6.61	6.88	8.69	8.17	7.18	5.39	4.35	2.4	1.62	60.12
Total Growing Degee Days from March 1		0	0	124	200	318	483	611	559	415	301	99	44	3154
Gross Pond Evap	Inch	1.67	1.82	3.92	5.55	5.78	7.3	6.86	6.03	4.53	3.65	2.02	1.36	50.49
Net Pond Evap	Inch	0.73	1.58	3.15	5.15	2.77	6.86	4.96	5.52	3.87	3.14	1.32	0.91	39.96
Gilcrest	Avg. Temp ° F	25.63	24.17	39.07	48.89	56.33	66.05	71.09	68.78	62.77	52.51	32.64	26.43	47.86
Ref date as of 12/31/2014	Total Precip "	1.03	0.25	1	0.83	3.65	1.69	3.02	0.78	1.45	0.49	0.59	0.51	15.29
Site Type: Alfalfa	Total Alfalfa ETr "	1.68	2	4.59	6.6	6.82	8.44	8.22	6.9	5.46	4.04	2.27	1.5	58.52
Total Growing Degee Days from March 1		0	0	128	214	329	501	616	586	445	322	110	45	3296
Gross Pond Evap	Inch	1.41	1.68	3.86	5.54	5.73	7.09	6.9	5.8	4.59	3.39	1.91	1.26	49.16
Net Pond Evap	Inch	0.69	1.51	3.16	4.96	3.17	5.91	4.79	5.25	3.57	3.05	1.49	0.9	38.45
Longmont South	Avg. Temp ° F	29.8	26.83	40.19	48.97	56.08	65.11	70.68	68.37	62.57	54.17	36.02	28.93	48.98
Ref date as of 12/31/2014	Total Precip "	1.16	0.36	1.09	1.05	2.04	0.51	2.55	0.74	1.29	0.89	0.69	0.63	13
Site Type: Alfalfa	Total Alfalfa ETr "	2.73	2.55	5.31	6.55	6.65	8.75	7.92	7.04	5.42	4.68	3.1	1.75	62.45
Total Growing Degee Days from March 1		0	0	132	196	318	473	590	569	436	306	119	46	3185
Gross Pond Evap	Inch	2.29	2.14	4.46	5.5	5.59	7.35	6.65	5.91	4.55	3.93	2.6	1.47	52.44
Net Pond Evap	Inch	1.48	1.89	3.7	4.77	4.16	6.99	4.87	5.4	3.65	3.31	2.12	1.03	43.37
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	29.87	26.73	39.29	48.68	56.27	65.57	70.86	68.51	60.99	52.01	34.44	29.18	48.53
Ref date as of 12/31/2014	Total Precip "	0.43	0.7	1.5	0.44	4.07	1.36	3.58	0.84	1.32	0.98	0.92	0.35	16.49
Site Type: Turf	Total Alfalfa ETr "	2.08	2.13	4.09	5.8	5.97	7.26	6.53	6.13	4.29	3.48	2.06	1.43	51.25
Total Growing Degee Days from March 1		0	0	121	194	315	476	611	569	418	316	119	58	3197
Gross Pond Evap	Inch	1.75	1.79	3.44	4.87	5.01	6.1	5.49	5.15	3.6	2.92	1.73	1.2	43.05
Net Pond Evap	Inch	1.45	1.3	2.39	4.56	2.17	5.15	2.98	4.56	2.68	2.24	1.09	0.96	31.53
Windsor	Avg. Temp ° F	34.73	30.75	49.32	54.56	60.53	75.1	80.1	#N/A	#N/A	#N/A	#N/A	#N/A	55.01
Ref date as of 7/1/2012	Total Precip "	0.02	0.47	0.03	1.07	1.6	0.05	0	#N/A	#N/A	#N/A	#N/A	#N/A	3.24
Site Type: Dryland Pasture	Total Alfalfa ETr "	2.56	2.44	6.69	6.86	6.23	6.65	0	#N/A	#N/A	#N/A	#N/A	#N/A	31.43
Total Growing Degee Days from March 1		0	0	285	312	399	622	22	#N/A	#N/A	#N/A	#N/A	#N/A	1640
Gross Pond Evap	Inch	2.15	2.05	5.62	5.76	5.23	5.59	0	#N/A	#N/A	#N/A	#N/A	#N/A	26.4
Net Pond Evap	Inch	2.14	1.72	5.6	5.01	4.11	5.55	0	#N/A	#N/A	#N/A	#N/A	#N/A	24.13
Greeley West	Avg. Temp ° F	27.25	24.05	38.84	48.77	56.76	66.17	71.45	68.86	62.36	52	33.09	27.36	48.08
Ref date as of 12/31/2014	Total Precip "	1.17	0.39	1.12	0.59	4	1.62	3.62	0.66	1.46	1.38	0.87	0.57	17.45
Site Type: Turf	Total Alfalfa ETr "	1.82	1.93	4.06	6.25	6.56	7.79	7.39	6.51	5.02	3.67	1.98	1.43	54.41
Total Growing Degee Days from March 1		0	0	122	211	335	500	632	591	439	306	97	38	3271
Gross Pond Evap	Inch	1.53	1.62	3.41	5.25	5.51	6.54	6.21	5.47	4.22	3.08	1.66	1.2	45.7
Net Pond Evap	Inch	0.71	1.35	2.63	4.84	2.71	5.41	3.67	5.01	3.19	2.12	1.05	0.8	33.49
Loveland	Avg. Temp ° F	29.11	26.64	40.14	49.3	56.97	66.15	71.43	68.98	61.71	52.75	34.24	28.32	48.81
Ref date as of 12/31/2014	Total Precip "	0.67	0.76	1.04	0.41	6.15	0.58	2.45	1.73	1.37	0.98	0.67	0.43	17.24
Site Type: Turf	Total Alfalfa ETr "	1.87	2.16	4.07	5.59	5.88	6.94	6.41	5.8	4.3	3.51	2.14	1.27	49.94
Total Growing Degee Days from March 1		0	0	152	223	349	510	648	599	435	332	114	55	3417
Gross Pond Evap	Inch	1.57	1.81	3.42	4.7	4.94	5.83	5.38	4.87	3.61	2.95	1.8	1.07	41.95
Net Pond Evap	Inch	1.1	1.28	2.69	4.41	0.63	5.42	3.67	3.66	2.65	2.26	1.33	0.77	29.87
Berthoud	Avg. Temp ° F	28.01	25.03	39.34	48.48	55.89	65.08	70.62	68.32	61.72	53.03	34.15	28.85	48.21
Ref date as of 12/31/2014	Total Precip "	1.36	0.32	0.97	0.58	5.24	0.78	2.77	0.7	0.96	0.45	0.96	0.61	15.7
Site Type: Turf	Total Alfalfa ETr "	1.87	2.04	4.47	6.09	6.36	7.89	7.46	6.7	4.92	3.92	2.24	1.39	55.35
Total Growing Degee Days from March 1		0	0	116	200	315	474	617	574	414	287	98	39	3134
Gross Pond Evap	Inch	1.57	1.71	3.75	5.12	5.34	6.63	6.27	5.63	4.13	3.29	1.88	1.17	46.49
Net Pond Evap	Inch	0.62	1.49	3.08	4.71	1.67	6.08	4.33	5.14	3.46	2.98	1.21	0.74	35.51
Longmont West	Avg. Temp ° F	30.43	27.8	41.39	50.29	57.49	66.82	72.02	69.26	61.6	52.73	34.68	28.5	49.42
Ref date as of 12/31/2014	Total Precip "	0.42	0.26	0.86	0.76	2.45	0.77	3.48	2.05	1.17	0.69	0.46	0.43	13.8
Site Type: Turf	Total Alfalfa ETr "	1.91	2.08	4.18	5.71	6.11	7.51	6.89	6.08	4.1	3.43	2.23	1.23	51.46
Total Growing Degee Days from March 1		0	0	143	205	329	506	643	590	421	300	110	46	3293
Gross Pond Evap	Inch	1.6	1.75	3.51	4.8	5.13	6.31	5.79	5.11	3.44	2.88	1.87	1.03	43.22
Net Pond Evap	Inch	1.31	1.57	2.91	4.26	3.42	5.77	3.35	3.67	2.63	2.4	1.55	0.73	33.57
Fort Lupton	Avg. Temp ° F	30.23	27.2	41.11	50.03	57.62	67.09	72.62	69.24	63.38	53.94	35.1	28.81	49.7
Ref date as of 12/31/2014	Total Precip "	0.77	0.37	1.2	0.9	3.34	2.09	2.66	1.65	2.43	0.61	0.72	0.54	17.28
Site Type: Turf	Total Alfalfa ETr "	2.31	2.39	4.85	6.48	7.11	8.98	8.33	6.96	5.47	4.26	2.62	1.61	61.37
Total Growing Degee Days from March 1		0	0	148	220	348	520	657	610	448	319	120	49	3439
Gross Pond Evap	Inch	1.94	2.01	4.07	5.44	5.97	7.54	7	5.85	4.59	3.58	2.2	1.35	51.54
Net Pond Evap	Inch	1.4	1.75	3.23	4.81	3.63	6.08	5.14	4.69	2.89	3.15	1.7	0.97	39.44
Boulder NW	Avg. Temp ° F	37.65	29.64	50.39	53.79	60.03	74.83	75.52	73.33	64.89	49.14	44.06	32.86	53.84
Ref date as of 12/31/2012	Total Precip "	0.17	0.9	0.01	1.2	1.64	0.63	3.28	0.24	2.33	1.02	0.24	0.26	11.92
Site Type: Turf	Total Alfalfa ETr "	3.02	2.28	5.99	6.28	7.09	8.53	8	7.62	5.53	3.55	2.65	2.06	62.6
Total Growing Degee Days from March 1		0	0	273	293	393	633	718	655	468	224	146	51	3854
Gross Pond Evap	Inch	2.54	1.92	5.03	5.28	5.96	7.17	6.72	6.4	4.65	2.98	2.23	1.73	52.61
Net Pond Evap	Inch	2.42	1.29	5.02	4.44	4.81	6.72	4.42	6.23	3.01	2.27	2.06	1.55	44.24
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	#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 12/30/2015	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
Greeley04	Avg. Temp ° F	25.95	22.36	38.36	48.45	56.78	65.49	69.82	67.66	61.37	51.26	31.79	25.25	47.05
Ref date as of 12/31/2014	Total Precip "	0.27	0.07	0.66	0.63	4.88	2.38	4.37	0.73	1.36	0.5	0.41	0.05	16.31
Site Type: Fully irrigated	Total Alfalfa ETr "	2.51	2.14	4.58	7.31	7.49	8.92	7.04	6.08	5.13	3.97	2.72	1.81	59.7
Total Growing Degee Days from March 1		0	0	125	219	346	500	589	569	436	318	97	38	3237
Gross Pond Evap	Inch	2.11	1.8	3.85	6.14	6.29	7.49	5.91	5.11	4.31	3.33	2.28	1.52	50.14
Net Pond Evap	Inch	1.92	1.75	3.39	5.7	2.88	5.83	2.85	4.6	3.36	2.98	2	1.49	38.75