Phoenix Climate Records and Averages

Temperatures in Phoenix, Arizona range from very hot in summer to mild in winter. Many winter days exceed 70 degrees and typical high temperatures in the middle of the winter are in the 60s. The climate becomes less comfortable in the summer. The normal high temperature exceeds 90 degrees from early May through early October and over 100 degrees from early June through early September. Many days each summer will exceed 110 degrees in the afternoon and remain above 85 degrees at night. When temperatures are extremely high, the low humidity provides a small amount of comfort.

The climate of Phoenix is very dry. Annual precipitation is only 7.53 inches, and afternoon humidity ranges from 30 percent in winter to only 10 percent in June. The majority of rain occurs during two seasons. From Thanksgiving to early April there are periodic rains from Pacific storms. Moisture from the south and southeast result in a summer thunderstorm peak in July and August. Usually the break from extreme dryness in June to the onset of thunderstorms in early July is very abrupt. Fog is rare, occurring about once per winter and is unknown in the other seasons.

The Valley is characterized by light winds. High winds associated with thunderstorms occur periodically in the summer. These occasionally create dust storms which move large distances across the deserts. Strong thunderstorm winds can occur during any month of the year, but are rare outside the summer months. Persistent strong winds of 30 mph or more are rare with an average of two or three events in an average spring due to Pacific storms. Winter storms rarely bring high winds due to the relatively stable air in the valley during that season..

	Monthly Averages			Daily Extremes				Monthly Extremes
Temperatures in F	Max.	Min.	Avg	High	Date of daily extreme high	Low	Date of daily extreme low	Highest Avg	Year	Lowest Avg	Year
January	66.1	41.6	53.8	88	19/1971	17	05/1950	62.0	2003	43.7	1949
February	70.0	44.5	57.3	92	27/1986	24	09/1946	66.0	1991	47.0	1939
March	75.9	49.1	62.5	100	26/1988	25	04/1966	72.3	2004	55.1	1935
April	84.4	55.8	70.1	105	20/1989	34	10/1935	80.0	1989	61.6	1941
May	93.7	64.2	78.9	113	26/1951	40	08/1965	87.0	1984	70.9	1953
June	103.0	72.8	87.9	122	26/1990	50	17/1944	94.6	2006	78.9	1965
July	105.7	80.5	93.1	121	28/1995	61	02/1941	98.3	2009	86.7	1955
August	103.5	79.2	91.3	117	10/1933	60	18/1938	96.2	2007	85.7	1956
September	99.1	72.9	86.0	118	01/1950	47	20/1965	92.2	2001	78.9	1941
October	88.2	60.8	74.5	107	01/1980	34	30/1971	82.7	2003	66.5	1941
November	75.3	48.4	61.9	96	03/2009	25	25/1938	70.0	2007	53.2	1938
December	66.5	41.7	54.1	88	10/1950	22	05/1948	61.3	1980	48.2	1967

Annual	85.9	59.3	72.6	122	1990/06/26	17	1950/01/05	76.9	1989	67.8	1964

Winter	67.6	42.6	55.1	92	1986/02/27	17	1950/01/05	60.6	1981	48.5	1949
Spring	84.7	56.3	70.5	113	1951/05/26	25	1966/03/04	77.7	1989	63.8	1965
Summer	104.0	77.5	90.8	122	1990/06/26	50	1944/06/17	94.9	2007	85.1	1941
Fall	87.5	60.7	74.1	118	1950/09/01	25	1938/11/25	80.0	2001	68.5	1941

												Total Snowfall
	Avg.	High	Year	Low	Year	1 Day Max.		>= 0.01 in.	>= 0.10 in.	>= 0.50 in.	>= 1.00 in.	Mean	High	Year
	in.	in.	-	in.	-	in.	dd/yyyy or yyyymmdd	# Days	# Days	# Days	# Days	in.	in.	-
January	0.80	5.22	1993	0.00	1970	1.33	21/2010	4	2	0	0	-	-	-
February	0.77	3.15	2003	0.00	1967	1.46	24/1987	4	2	0	0	0.0	0.6	1939
March	0.86	3.27	1941	0.00	1940	1.98	03/1983	4	2	1	0	-	-	-
April	0.29	2.10	1941	0.00	1950	0.92	11/1941	2	1	0	0	-	-	-
May	0.13	1.06	1976	0.00	1938	0.91	04/1976	1	0	0	0	-	-	-
June	0.09	1.70	1972	0.00	1939	1.37	22/1972	1	0	0	0	-	-	-
July	0.85	5.15	1984	0.00	1993	1.90	28/1984	4	2	0	0	-	-	-
August	1.02	5.56	1951	0.00	1973	2.99	03/1943	5	2	1	0	-	-	-
September	0.69	4.23	1939	0.00	1938	2.43	05/1970	3	1	0	0	-	-	-
October	0.57	4.40	1972	0.00	1934	2.32	14/1988	3	1	0	0	-	-	-
November	0.56	3.04	1952	0.00	1937	1.58	14/1993	2	1	0	0	-	-	-
December	0.90	3.98	1967	0.00	1933	1.49	30/1940	4	2	1	0	0.0	0.4	1990

Annual	7.53	15.37	1941	2.82	1956	2.99	1943/08/03	35	18	4	1	0.0	0.4	1990

Winter	2.47	10.02	1993	0.00	2006	1.49	1940/12/30	12	6	1	0	0.0	0.4	1991
Spring	1.28	6.18	1941	0.00	1972	1.98	1983/03/03	6	3	1	0	-	-	-
Summer	1.96	6.94	1955	0.26	1991	2.99	1943/08/03	9	5	1	0	-	-	-
Fall	1.82	5.69	1972	0.00	1938	2.43	1970/09/05	8	4	1	0	-	-	-

Winter = Dec, Jan, and Feb		Spring = Mar, Apr, and May
Summer = Jun, Jul, and Aug.		Fall = Sep, Oct, and Nov