OK48 Coop Summary

Back to County Climate Tulsa

Cooperative Observer Station Summary

KEYSTONE DAM (344812)
*	TULSA County	Climate Division: 3
*	Latitude: 3609N; Longitude: 09615W	Elevation: 704 ft
*	Precipitation Period of Record:	1957/08-1997/04 ( 95%)
*	Temperature Period of Record:	1957/08-1997/04 ( 89%)

	Temperature (deg Fahrenheit)			Precipitation (inches)	Snowfall and Sleet (inches)
Monthly Averages (1971-2000)
	Daily Max	Daily Min	Daily Avg	Monthly Average	Monthly Average
January	NA	NA	NA	NA	NA
February	NA	NA	NA	NA	NA
March	NA	NA	NA	NA	.6
April	NA	NA	NA	NA	.0
May	NA	NA	NA	NA	.0
June	NA	NA	NA	NA	.0
July	NA	NA	NA	NA	.0
August	NA	NA	NA	NA	.0
September	NA	NA	NA	NA	.0
October	NA	NA	NA	NA	.0
November	NA	NA	NA	NA	.1
December	NA	NA	NA	NA	NA
Annual	NA	NA	NA	NA	NA

	Temperature					Precipitation						Snowfall and Sleet
Average Number of Days Per Month (1971-2000)
	Max>100	Max>90	Max<32	Min<32	Min<0	any	meas	0.10"+	0.25"+	0.50"+	1.00"+	any	meas	0.50"+	1.00"+	Glazing
Jan	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Feb	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Mar	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	*	*	*	*	*
Apr	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	*	0	0	0	*
May	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Jun	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Jul	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Aug	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Sep	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Oct	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0	0	0	0	0
Nov	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	*	*	*	*	NA
Dec	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Ann	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

Month	Maximum Temperature Higher Than:	Minimum Temperature Lower Than:	Precipitation Less Than:	Precipitation Greater Than:
Exceedence Values (2 in 10 years)
January	74	-2	.24	1.96
February	80	3	.93	3.13
March	87	12	1.29	4.63
April	90	27	2.19	5.86
May	92	37	2.92	7.75
June	98	48	2.63	6.55
July	105	54	.78	4.67
August	105	53	1.56	4.12
September	101	37	2.09	7.23
October	92	28	.99	6.29
November	83	14	.87	4.83
December	74	3	.53	2.91
Annual	107	-3	32.10	45.60

	Temperature (F) (1957-1997)				Precipitation (inches) (1957-1997)		Snowfall (1957-1997)
Monthly Extremes
	Record High		Record Low		Monthly Max	Daily Max	Monthly Max	Daily Max	Greatest Depth
Jan	79	( 3rd, 1997)	-8	( 5th, 1959)	3.41" (1975)	2.47" (31st, 1975)	10.0" (1988)	10.0" ( 7th, 1988)	6.0" ( 6th, 1962)
Feb	91	(23rd, 1996)	-11	( 1st, 1979)	6.39" (1985)	4.87" (23rd, 1985)	6.5" (1982)	6.5" (12th, 1982)	4.0" (12th, 1972)
Mar	92	(12th, 1967)	0	( 3rd, 1960)	9.27" (1973)	3.64" (12th, 1990)	11.5" (1964)	9.0" ( 6th, 1989)	9.0" ( 6th, 1989)
Apr	100	(13th, 1972)	20	( 3rd, 1975)	9.01" (1995)	6.30" ( 6th, 1964)	.0" (1973)	.0" ( 1st, 1973)	.0" -
May	97	(31st, 1985)	34	( 1st, 1963)	11.99" (1982)	5.80" (12th, 1982)	.0" -	.0" -	.0" -
Jun	100	(27th, 1980)	42	( 1st, 1983)	10.89" (1995)	4.11" (10th, 1995)	.0" -	.0" -	.0" -
Jul	110	(30th, 1986)	45	(31st, 1971)	10.02" (1960)	5.15" ( 4th, 1960)	.0" -	.0" -	.0" -
Aug	110	( 6th, 1964)	46	(29th, 1986)	6.83" (1974)	3.69" (15th, 1969)	.0" -	.0" -	.0" -
Sep	105	( 5th, 1978)	29	(30th, 1984)	14.29" (1971)	6.07" (30th, 1986)	.0" -	.0" -	.0" -
Oct	97	(10th, 1963)	21	(30th, 1980)	9.57" (1983)	4.21" (22nd, 1972)	.0" -	.0" -	.0" -
Nov	86	( 7th, 1980)	1	(29th, 1976)	8.56" (1974)	4.10" ( 3rd, 1974)	1.0" (1972)	1.0" (21st, 1972)	1.0" (26th, 1975)
Dec	80	( 8th, 1966)	-7	(22nd, 1989)	7.07" (1984)	2.34" (24th, 1965)	4.0" (1969)	3.0" (22nd, 1963)	4.0" (31st, 1969)
Annual	110	(Jul 30, 1986)	-11	(Feb 1, 1979)	14.29" (Sep 1971)	6.30" (Apr 6, 1964)	11.5" (Mar 1964)	10.0" (Jan 7, 1988)	9.0" (Mar 6, 1989)

Probability	24 F or Lower	28 F or Lower	32 F or Lower
First Freezing Temperature in Fall
1 Year in 10	November 4	October 26	October 12
2 Years in 10	November 5	October 30	October 15
5 Years in 10	November 20	November 7	October 26
Last Freezing Temperature in Spring
Probability	24 F or Lower	28 F or Lower	32 F or Lower
1 Year in 10	March 30	April 11	April 21
2 Years in 10	March 26	April 5	April 15
5 Years in 10	March 16	March 26	April 5

Probability	Higher Than 24 F	Higher Than 28 F	Higher Than 32 F
Number of Days in Growing Season
9 Years in 10	229	212	182
8 Years in 10	233	217	190
5 Years in 10	245	230	204
2 Years in 10	267	240	216
1 Year in 10	277	246	223

PERCENT	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANNUAL
Precipitation Quantiles (Inches)
MEAN	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
10%	.20	.71	.97	1.15	2.39	1.81	.37	.95	1.95	.71	.37	.39	29.68
20%	.24	.93	1.29	2.19	2.92	2.63	.78	1.56	2.09	.99	.87	.53	32.10
30%	.47	1.10	2.44	2.58	3.37	3.11	1.82	1.65	2.67	1.42	1.47	.95	34.25
40%	.61	1.40	2.76	3.32	3.84	3.59	1.90	2.24	3.03	1.71	1.92	1.20	35.57
50%	1.08	1.53	2.95	3.55	4.37	4.08	2.31	2.91	4.17	2.43	2.47	1.32	36.33
60%	1.29	1.96	3.17	4.29	5.43	4.77	3.08	3.42	5.72	3.31	3.24	1.60	41.03
70%	1.61	2.43	3.74	4.80	6.30	4.96	3.53	3.64	6.52	4.67	3.90	1.82	42.94
80%	1.96	3.13	4.63	5.86	7.75	6.55	4.67	4.12	7.23	6.29	4.83	2.91	45.60
90%	2.67	4.24	7.30	6.93	9.82	8.29	6.14	5.53	8.27	7.12	7.93	5.08	53.22