CLIMATOLOGICAL DATA							HANFORD METEOROLOGY STATION 25 MILES N.W. OF RICHLAND, WA LATITUDE 46º 34'N, LONGITUDE 119º 36'W ELEVATION (GROUND) 733 FEET							MONTH: December 1999
	TEMPERATURE (ºF) (3-FT LEVEL)						PRECIPITATION			WIND (50-FT LEVEL)							FRONTS & MISC PHENOM
D A T E	M A X I M U M	M I N I M U M	A V E R A G E	D E P A R T U R E	H D D 65 ºF	C D D 65 ºF	T O T A L IN.	S N O W IN.	SNOW ON GRND AT 0400 IN.	P R E V A I L DIR	A V E SPD MPH	PK G U S T SPD MPH	PK G U S T DIR	A V E RH %	S O L A R A D	S K Y C V R SR TO SS	NOTE:TYPES AND TIMES OF FRONTAL PASSAGES "KFR"(COLD) "WFR"(WARM)
1	52	39	46	+11	19	0	0.01			SW	9.7	31	SSE	69	95	8
2	53	36	44	+9	21	0	0.01			W	17.2	45	W	61	118	5	KFR 0800
3	49	26	38	+3	27	0				W	5.8	21	W	60	131	3
4	43	26	34	-1	31	0				NW	7.4	16	NW	81	145	1
5	45	24	34	0	31	0				SE	3.7	24	SSW	83	77	8	F
6	57	37	47	+13	18	0				S	15.5	38	S	56	114	7	KFR 1500
7	48	24	36	+3	29	0				NW	5.9	18	NNW	72	148	7
8	34	20	27	-6	38	0	T	T		NW	5.1	12	NW	92	41	10	F
9	44	30	37	+4	28	0	T			W	5.0	18	WNW	89	80	8	F,KFR 0800
10	48	24	36	+4	29	0				W	5.0	19	WSW	79	65	10	F
11	54	31	42	+10	23	0				N	6.4	25	WSW	71	110	8
12	57	31	44	+12	21	0				SW	17.5	49	S	58	54	10	KFR 1530
13	48	32	40	+9	25	0				SW	14.9	42	SW	49	117	3
14	50	31	40	+9	25	0				SW	17.3	42	S	59	58	10
15	59	49	54	+23	11	0				SW	22.1	50	SSW	57	68	10	WFR 2130
16	62	44	53	+23	12	0				W	9.8	29	WNW	57	107	4	KFR 1415
17	51	34	42	+12	23	0	T			NE	6.1	43	WSW	82	28	10	KFR 1800
18	56	42	49	+19	16	0				W	17.2	62	WSW	50	80	7
19	50	29	40	+10	25	0				NW	6.1	23	WNW	62	103	8
20	46	24	35	+5	30	0				NW	4.4	12	SW	85	135	3
21	36	26	31	+1	34	0				SE	3.6	11	WSW	95	97	7	F
22	33	30	32	+2	33	0				W	4.3	10	NW	96	19	10	F
23	37	33	35	+5	30	0	T			S	2.8	8	NNE	93	19	10	F
24	35	32	34	+4	31	0	0.01			E	3.1	9	ESE	97	23	10	F
25	36	32	34	+4	31	0	0.01			SE	2.7	7	NNW	93	16	10	F
26	36	33	34	+4	31	0				NW	3.5	9	NW	79	13	10
27	34	32	33	+4	32	0				N	2.3	8	N	80	8	10
28	32	30	31	+2	34	0				S	2.2	6	SSE	80	20	10
29	31	29	30	+2	35	0				S	2.0	9	SSW	80	13	10
30	31	28	30	+2	35	0				SW	2.4	9	SSW	80	25	10
31	32	22	27	-1	38	0	0.03	0.6	T	W	2.0	10	ESE	92	39	10	F,IP
SUM					846	0	0.07	0.6
AVG	44.5	31.0	37.7								7.5					8.0

NOTES:				PRECIPITATION (IN.)				MISC. PHENOM. KEY
Daily summary period is midnight to midnight PST				TOTAL FOR THE MONTH			0.07	A-Hail, BD-Blowing Dust, BS-Blowing Snow
"T" in columns 7-9 denotes a trace				DEPARTURE FROM NORM			-0.96	D-Dust, AU-Aurora, DL-Distant Lightning
Snow in columns 8-9 is all frozen precipitation				24HR MAX	0.03	ON	31	F-Fog, IC-Ice Crystals, K-Smoke
Solrad in column 15 is in Langleys; g-cal/sq. cm				NUMBER OF DAYS WITH:				GL-Glaze, T-Thunderstorm, DS-Drifting Snow
TEMPERATURE (ºF) (3-FT LEVEL)				>= T	9	>= 0.25	0	BAROMETRIC PRESSURE (IN.)
AVERAGE FOR THE MONTH			37.7	>= 0.01	5	>= 0.50	0	AVERAGE STATION			29.458
DEPARTURE FROM NORMAL			+6.3	>= 0.10	0	>= 1.00	0	MAX SEA-LEVEL	30.91	ON	25
HIGHEST	62	ON	16	SNOW (FROZEN PRECIP.) (IN.)				MIN SEA-LEVEL	29.56	ON	2
LOWEST	20	ON	8	TOTAL FOR THE MONTH			0.6	SOLAR RADIATION (LANGLEYS)
NUMBER OF DAYS WITH:				24HR MAX	0.6	ON	31	AVERAGE DAILY TOTAL			69.9
MAXIMUM 32 OR BELOW			4	MAX ON GRND	0.6	ON	31	MAX DAILY	148	ON	7
MAXIMUM 90 OR ABOVE			0	WIND (50-FT LEVEL)				MIN DAILY	8	ON	27
MINIMUM 32 OR BELOW			22	AVERAGE SPEED (MPH)			7.5	MISCELLANEOUS NUMBER OF DAYS
MINIMUM 0 OR BELOW			0	DEPARTURE FROM NORM			+1.6	CLEAR	4	FOG	10
HEATING DEGREE DAYS (BASE 65ºF)				PEAK GUST	WSW @ 62	ON	18	PARTLY CLOUDY	6	THDR	0
TOTAL FOR THE MONTH			846	AVERAGE PSYCHROMETRIC DATA				CLOUDY	21	DUST	0
DEPARTURE FROM NORMAL			-196	DRY BULB (ºF)	38.3	WET BULB (ºF)	35.1	RELATIVE HUMIDITY EXTREMES (%)
SEASON TOTAL (SINCE JULY 1)			1919	REL. HUM. (%)	75.4	DEW PT.(ºF)	30.6	HIGHEST	100	ON	31+
SEASON DEPARTURE FROM NORM			-334	+ DENOTES LATEST OF MULTIPLE DAYS				LOWEST	30	ON	2