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CONTENTS

Introduction
Physiography
Weather Data
Geologic History
Changing Climates
Weathering & Erosion
Carbonate Rocks
Granitic Rocks
Volcanic Rocks
Faults
Pediments
Stream Channels
Stream Terraces
The Mojave River
Playas
Sand Dunes
Human Impacts
References


 Geology - Mojave National Preserve:
Landforms & Erosional Processes

Weather Data

Historic weather data for the Mojave National Preserve is relatively scarce because there are no significant population centers or airports in the vicinity where records were kept. The table below provides a summary of selected sites and data from in and around the greater Mojave region that might serve as a proxy for weather conditions in different settings within the national preserve (none of the sites are within the preserve itself). In the future data from many additional weather stations in the region will be available.

The weather data basically shows what any of the regional residents could tell you. The region has very hot summers and cool winters. Most of the rain falls in the winter months, but August typically has some monsoonal storms. Spring tends to be the windiest season, and fall is the dryest and least windy season.


Location Barstow Bishop    Blythe    
FAA		 Daggett FAA Death     Valley Eagle Mountain Mitchell
Caverns**
Latitude N34-54 N37-22 N33-37 N34-52 N36-28 N33-48 N34-56
Longitude W117-02 W118-22 W114-36 W116-47 W116-52 W115-27 W115-30
Elevation 2,162 4,108 268 1,922 -194 973 4,350
Temperature
Degrees F		              

January
Maximum
Minimum
Mean
60.0
31.7
45.9
52.9
21.4
37.2
67.6
38.2
52.9
60.7
35.9
48.3
65.3
39.6
52.5
64.1
44.1
54.1
54.4
36.9
--

April
Maximum
Minimum
Mean
77.0
45.0
61.1
70.9
35.8
53.4
86.5
52.1
69.3
78.0
50.2
64.1

89.5
62.1
75.8
81.5
59.2
70.4
69.5
48.2
--

July
Maximum
Minimum
Mean
102.6
67.2
84.2
97.5
56.3
77.0
108.7
76.8
92.8
104.0
73.2
88.6

115.4
88.4
101.9
105.2
82.8
94.0
94.0
71.1
--

October
Maximum
Minimum
Mean
83.0
48.1
65.5
77.1
37.4
57.3
90.7
56.1
73.4
83.2
54.6
68.9

92.9
62.9
77.9
87.5
64.6
76.1
75.1
54.4
--

Annual
Maximum
Minimum
Mean
80.3
47.7
64.0
74.4
37.6
56.0
88.1
55.4
71.8
81.1
53.2
67.2
90.4
63.0
76.7
84.3
62.4
74.3
73.0
52.3
--

Precipitation
Normals (IN)

              
January .66 1.32 .44 .56 .27 .41 1.54
April .22 .31 .17 .27 .14 .14 .53
July .31 .19 .11 .32 .16 .41 .90
August .30 .11 .94 .50 .09 .56 1.80
October .19 .17 .32 .17 .11 .25 .73
Annual 4.14 5.61 3.75 3.81 2.03 3.26 11.82

Wind Speed
Average MPH

              
January   7.1 6.5 8.6      
April   10.1 8.9 13.8      
July   8.3 9.4 12.2      
August   8.4 8.8 11.4      
October   8.1 6.7 9.5      
Annual   8.4 7.8 10.9      


Location Needles FAA Palm
Springs  		 Palmdale
 Parker Reservoir Randsburg Thermal
FAA

Twentynine Palms

Latitude N34-46 N33-49 N34-35 N34-17 N35-22 N33-38 N34-08
Longitude W114-37 W116-32 W118-06 W114-10 W117-39 W116-10 W116-02
Elevation 913 411 2,596 738 3,570 120 1,975
Temperature
Degrees F		              

January
Maximum
Minimum
Mean
62.9
40.9
51.9
69.3
40.8
55.1
58.6
32.2
45.4
63.9
42.4
53.2
53.8
35.7
44.7
69.8
38.3
54.1
62.7
35.3
49.0

April
Maximum
Minimum
Mean
83.4
56.3
69.9
86.2
52.2
69.2
72.9
42.6
57.8
83.3
58.7
71.1
71.0
45.6
58.4
85.6
55.1
70.4
81.0
48.5
64.7

July
Maximum
Minimum
Mean
108.7
83.1
95.9
109.1
74.1
91.7
97.7
65.0
8.14
107.8
83.4
95.6
98.8
68.7
83.8
106.9
76.9
91.9
105.4
72.1
88.7

October
Maximum
Minimum
Mean
87.9
61.1
74.7
92.1
57.9
75.0
80.6
47.4
64.0
89.5
64.4
77.0
77.1
53.2
65.2
91.0
57.8
74.4
86.0
52.7
69.6

Annual
Maximum
Minimum
Mean
85.5
60.1
72.8
88.8
55.8
72.3
77.1
46.4
61.6
85.5
61.9
73.9
74.9
50.4
62.7
88.1
56.7
72.4
83.5
51.8
67.7

Precipitation
Normals (IN)

              
January .52 1.26 1.73 .78 1.23 .52 .42
April .26 .17 .53 .23 .40 .07 .12
July .47 .04 .04 .31 .12 .18 .67
August .67 .06 .23 .60 .16 .30 .68
October .35 .65 .16 .46 .20 .14 .26
Annual 4.39 5.20 7.38 4.97 5.48 2.82 3.89

Wind Speed
Average MPH

              
January   6.6 8.8     5.0 6.1
April   10.3 12.9     8.3 9.9
July   9.7 12.0     7.0 8.1
August   8.9 10.8     6.2 7.5
October   8.0 9.2     5.9 6.0
Annual   8.7 10.6     6.5 7.6

Temperature and precipitation data from: NOAA, National Climatic Center (re-compiled by Gale Research Company, 1983, Climate Normals for the U.S. [Base: 1951-1980]: Detroit, MI.) **Mitchell Caverns, CA data reported from 1971 to 2000.

Wind data from: Western Regional Climate Center ( Desert Research Institute and others; Reno, NV): The monthly average wind speeds are based on hourly observations from reporting airports and based on data from 1992-2002.


Next > Geologic History

 Map of historic weather stations in the Mojave region


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