Table 4. Summary of mean monthly air temperature, dew point, wind speed, and precipitation data from National Weather Service stations, mean monthly water temperature from U.S. Geological Survey pelagic monitoring stations, 1991–2006, and calculated mean monthly and total mean annual precipitation to and evaporation from Coeur d’Alene Lake, Idaho.

[Locations for sites are shown in figure 1. Methods used from Allen and others (2007). Precipitation (in.) based on period of record for stations Coeur d’Alene 1E (CDA), Plummer 3 WSW (P3), and St. Maries (SM). Abbreviations: acre-ft, acre-foot; °C, degrees Celsius; CDA, weather station at Coeur d’Alene 1E; in., inch; in/month, inch per month; kg/m³, kilogram per cubic meter; kg_vapor/kg_air, kilogram of vapor per kilogram of air; m/s, meter per second; ρ_air , density of moist air; q_saTs , saturated specific humidity at surface temperature (Ts); q_a , specific humidity at observation height; e_surface , water surface vapor pressure; e_air, air vapor pressure; LE, latent heat flux; W/m², watt per square meter; E, evaporation rate; USGS, U.S. Geological Survey; na, not applicable]

Month	Air temperature (°C)	CDA weather station		Mean precipitation (in.)	USGS pelagic stations		Coeur d’Alene Lake
		Dew point (°C)	Wind speed (m/s)		Water temperature (°C)		Precipitation (acre-ft)	Evaporation (acre-ft)	ρair (kg/m3)	qsaTs (kgvapor/kgair)	qa (kgvapor/kgair)	esat(kPa)	eair(kPa)	LE (W/m2)	E (in/month)
January	-1.6	-7.8	3.5	3.7	1.8		9,850	3,850	1.2	0.0044	0.0023	0.67	0.34	34	1.4
February	.73	-3.9	3.4	2.9	1.8		7,720	2,940	1.2	.0049	.0030	.74	.46	28	1.1
March	3.8	-2.8	3.7	2.4	1.6		6,390	3,250	1.2	.0051	.0033	.76	.50	28	1.2
April	7.7	0	3.5	2.0	3.0		5,320	2,950	1.2	.0058	.0041	.88	.61	27	1.1
May	12	4.4	3.4	2.3	7.2		6,120	2,500	1.1	.0071	.0056	1.1	.84	22	.94
June	15	7.8	3.2	1.9	12.8		5,270	3,390	1.1	.0094	.0071	1.4	1.1	31	1.3
July	20	8.9	3.0	.8	17.2		2,080	7,500	1.1	.013	.0076	1.9	1.1	65	2.8
August	19	8.3	3.0	1.0	17.3		2,660	9,150	1.1	.014	.0073	2.1	1.1	80	3.4
September	15	5.6	3.0	1.2	14.3		3,190	7,360	1.1	.011	.0061	1.7	.91	66	2.8
October	8.4	3.3	3.0	2.3	11.9		6,120	6,140	1.2	.0094	.0052	1.4	.77	54	2.3
November	2.6	0	3.4	3.7	3.4		9,850	3,900	1.2	.0064	.0041	.97	.61	35	1.5
December	-1.1	-3.9	3.4	4.0	3.4		10,600	3,930	1.2	.0053	.0030	.80	.46	35	1.5
Total	na	na	na	na	na		75,200	56,860	na	na	na	na	na	na	21