Just like about any summer, the June through August 1999 precipitation was above normal in some areas and below normal in others. However, this summer=s precipitation was above normal over approximately 80 percent of the state.
It is over western New Mexico we generally consider the Southwest monsoon to play a large role in the annual precipitation (40 to 50 percent of the annual total falls during the three summer months). In 1999, western New Mexico did especially well, with many areas receiving between 150 and 200 percent of the normal summer rainfall. Aztec, Star Lake, Augustine, and Hachita all exceeded 250 percent of the normal summer precipitation.
Meanwhile, the Eastern Plains is generally not considered to be an area especially affected by the Southwest monsoon. Precipitation from thunderstorms tends to be more spread out from mid-April through September over the eastern counties. The 1999 summer precipitation was above normal over some areas of the east, but below normal in other areas. The driest areas were from Roy to Tucumcari in the northeast, and generally south of a Lovington to Carlsbad line in the southeast. In the far southeast, Jal received only 56 percent of the normal precipitation, while Tucumcari (in the northeast) received 64 percent.
To sum the measured precipitation across the state and compare to normals provides a statewide average of how things went.This number may be rather meaningless for most purposes. The statewide average was 133 percent of normal.
| Weather Station | Normal Summer Precip. | 1999 Summer Precip. | % Normal |
| Abiquiu Dam | 4.44 | 9.67 | 218 |
| Alamogordo | 5.16 | 5.51 | 107 |
| Albuquerque | 3.48 | 5.11 | 147 |
| Alcalde | 4.08 | 7.37 | 181 |
| Animas | 4.96 | 5.75 | 116 |
| Augustine | 5.09 | 13.05 | 256 |
| Aztec Ruins | 2.56 | 7.33 | 286 |
| Beaverhead Ranger Stn. | 6.54 | ||
| Bernardo | 3.45 | 5.61 | 163 |
| Bingham | 5.04 | 7.13 | 141 |
| Black Lake | 9.17 | 14.40 | 157 |
| Bloomfield | 2.59 | 4.56 | 176 |
| Bosque Del Apache | 3.72 | 5.86 | 158 |
| Brazos Lodge | 5.96 | 10.05 | 169 |
| Buckhorn | 5.56 | 8.78 | 158 |
| Cameron | 8.78 | ||
| Canton | 6.82 | 9.25 | 136 |
| Capitan | 7.75 | 8.98 | 116 |
| Capulin/Des Moines | 9.28 | 14.42 | 155 |
| Carlsbad Airport | 5.19 | 3.82 | 74 |
| Carlsbad Caverns | 6.24 | ||
| Carlsbad City | 5.31 | ||
| Chaco Canyon | 2.93 | 5.69 | 194 |
| Chacon | 8.98 | 7.78 | 87 |
| Chama | 5.75 | 8.19 | 142 |
| Cimarron | 7.23 | 10.86 | 150 |
| Clayton | 6.84 | 6.39 | 93 |
| Clines Corners | 7.77 | ||
| Cloudcroft | 12.86 | ||
| Clovis 13N | 8.39 | 7.99 | 95 |
| Cochiti Dam | 4.75 | ||
| Columbus | 4.42 | 4.85 | 110 |
| Corona | 5.81 | 6.09 | 105 |
| Corrales | 4.42 | ||
| Cuba | 5.04 | 8.37 | 166 |
| Deming | 3.71 | 6.80 | 183 |
| Dilia | 6.58 | 11.76 | 179 |
| Dulce | 5.36 | 8.66 | 162 |
| Eagle Nest | 6.77 | 7.65 | 113 |
| El Rito | 4.71 | 9.46 | 201 |
| El Vado Dam | 5.03 | 9.45 | 188 |
| Elida | 7.22 | ||
| Estancia | 5.33 | 7.69 | 144 |
| Farmington Airport | 2.49 | 4.89 | 196 |
| Farmington | 2.21 | 5.94 | 269 |
| Fence Lake | 5.29 | 5.35 | 101 |
| Fort Sumner | 6.62 | 9.79 | 148 |
| Fruitland | 2.17 | 3.26 | 150 |
| Gallup Airport | 4.06 | 6.92 | 170 |
| Gascon | 10.66 | 10.10 | 95 |
| Ghost Ranch | 4.75 | 8.24 | 175 |
| Golden | 5.55 | 8.19 | 148 |
| Grants Airport | 4.46 | 8.39 | 188 |
| Hachita | 4.76* | 12.72 | 267 |
| Hobbs | 6.38 | ||
| House | 7.35 | 7.64 | 104 |
| Jal | 5.09 | 2.84 | 56 |
| Johnson Ranch | 4.37 | 11.39 | 261 |
| Las Cruces | 4.43 | 6.43 | 145 |
| Las Vegas Airport | 8.85 | 5.55 | 63 |
| Las Vegas Treatment | 9.47 | 14.15 | 149 |
| Los Alamos | 8.36 | ||
| Los Lunas | 3.60 | ||
| Maljamar | 6.49 | 5.41 | 83 |
| Moriarty | 8.11 | 5.12 | 63 |
| Mosquero | 7.98 | 5.47 | 69 |
| Orogrande | 5.00 | 7.28 | 146 |
| Pecos National Monument | 7.69 | 10.24 | 133 |
| Raton | 8.45 | 11.44 | 135 |
| Raton Filter Plant | 8.15 | 12.17 | 149 |
| Red River | 7.43 | 7.81 | 105 |
| Reserve Ranger Stn. | 5.88 | 7.45 | 127 |
| Roswell Airport | 5.06 | 6.36 | 126 |
| Roy | 8.02 | ||
| Ruidoso | 10.07 | 11.91 | 118 |
| San Jon | 8.14 | 5.67 | 70 |
| Sandia Park | 7.00 | 8.20 | 117 |
| Santa Fe | 5.38 | 5.47 | 102 |
| Santa Rosa | 6.81 | 6.59 | 97 |
| Silver City | 5.85 | 10.02 | 171 |
| Socorro | 3.77 | 6.42 | 170 |
| Springer | 7.96 | 9.30 | 117 |
| Stanley | 5.65 | 6.11 | 108 |
| Tatum | 7.01 | 12.05 | 172 |
| Taos | 4.57 | ||
| Tierra Amarilla | 5.42 | 5.09 | 94 |
| Thoreau | 4.49 | 5.61 | 125 |
| Truth or Consequences | 4.74 | ||
| Tucumcari Airport | 7.55 | 3.70 | 49 |
| Tucumcari | 7.19 | 4.62 | 64 |
| Villanueva | 5.10 | 9.85 | 193 |
| Total | 448.38** | 595.48 | 133 |
**Total does NOT include stations for which the 1999 summer precipitation is missing.