Santa Cruz Valley Climate

About half of the rainfall occurs during what is know as the summer monsoon season of July, August and September. This rain comes in from Mexico, in a form of brief, but often heavy, showers and thunderstorms. Winter rains are generally light- moderate, more soaking showers and they come in from the west coast. 

The growing season typically begins mid-March or April and ends in September, but can extend into October. Rainfall patterns are extremely spotty and drought occurs about every seven years interspersed with frequent small-scale droughts. Snowfall may occur early as October and as late as April. 
Average temperatures decrease as the altitude increases (a rule of thumb is 3 degrees F for each 1,000 feet of altitude). Even the lowest areas are subject to frost during the winter months. June is generally the hottest month; the monsoon rains cool things off a little later in the summer.
 
The climate chart provides a breakdown comparison of the communities in Southern Arizona and the United States averages. The Captured climate data was calculated by Sperling's BestPlaces. Information was updated in December 2016. 

Climate Chart

Hover over the climate categories with cursor pointer for detailed explanations.

CLIMATE

Nogales

Rio Rico

Tubac

Tumacacori

Patagonia

Sonoita

Elgin

Amado

Arivaca

Green Valley

Sahuarita

Tucson

United States

Annual Rainfall

17.8

16.8

15.6

15.8

19.1

17.4

16.6

15.2

19.9

13.9

12.6

12.2

39.2

Annual Snowfall

0.7

0.6

0.7

0.5

1.4

1.6

0.6

1

1.5

0.7

0.6

0.4

25.8

Precipitation Days

38.9

37.7

35.4

35.4

39.5

39.5

42.4

35.4

39.8

31.3

31.3

31.2

102

Sunny Days

288

284

284

284

287

284

284

284

285

280

287

286

205

Summer High

93.5

94.9

96.3

96.1

92.5

90

90.1

97.2

95.2

99.2

99.8

100.2

86.1

Winter Low

31.3

32.5

33.7

33.3

31.2

31.1

30.5

34.5

31.9

36.2

36.8

38.9

22.6

Comfort Index

71

69

69

82

80

87

81

77

66

81

75

78

54

UV Index

6.6

6.6

6.6

6.6

6.6

6.6

6.6

6.6

6.5

6.5

6.5

6.5

4.3

Elevation

3842

4544

3204

3298

4129

4910

4887

3082

2652

2944

2873

2512

1443