Nimbostratus Amount-When-Present (%) June, July, August (1954 - 1997) Night, Ship Observations Only Global Average: 98.6 Zonal Averages 15 zones Lat.N Average 85 98.5 75 99.1 65 99.2 55 99.6 45 99.6 35 99.1 25 97.6 15 98.6 5 98.7 -5 98.5 -15 98.0 -25 98.3 -35 98.1 -45 98.6 -55 99.5 Grid Box Averages 182 filled boxes Box # Lat.N Lon.E Average 1 85 60 98.3 2 85 180 98.3 3 85 300 98.9 4 75 20 99.0 5 75 60 98.9 6 75 100 100.0 7 75 140 98.6 8 75 180 99.2 9 75 220 98.8 10 75 260 99.4 11 75 300 99.3 12 75 340 99.6 13 65 10 99.2 14 65 30 98.7 15 65 50 98.7 21 65 170 99.8 22 65 190 99.6 23 65 210 99.5 25 65 250 98.5 26 65 270 97.4 27 65 290 99.4 28 65 310 99.3 29 65 330 99.3 30 65 350 99.4 31 55 10 99.0 32 55 30 99.3 38 55 150 99.8 39 55 170 99.8 40 55 190 99.8 41 55 210 99.8 42 55 230 99.6 45 55 290 99.5 46 55 310 99.5 47 55 330 99.5 48 55 350 99.1 49 45 5 96.6 50 45 15 98.3 62 45 135 99.8 63 45 145 99.9 64 45 155 99.8 65 45 165 99.9 66 45 175 99.8 67 45 185 99.8 68 45 195 99.8 69 45 205 99.8 70 45 215 99.6 71 45 225 99.3 72 45 235 99.2 77 45 285 98.9 78 45 295 99.5 79 45 305 99.4 80 45 315 99.6 81 45 325 99.5 82 45 335 99.1 83 45 345 99.1 84 45 355 98.6 85 35 5 97.5 86 35 15 94.2 97 35 125 99.3 98 35 135 99.4 99 35 145 99.5 100 35 155 99.6 101 35 165 99.5 102 35 175 99.3 103 35 185 99.3 104 35 195 99.2 105 35 205 99.0 106 35 215 98.5 107 35 225 98.3 108 35 235 98.8 113 35 285 98.5 114 35 295 98.5 115 35 305 98.1 116 35 315 98.7 117 35 325 98.6 118 35 335 98.2 119 35 345 97.5 120 35 355 97.8 132 25 115 97.7 133 25 125 98.9 134 25 135 99.0 135 25 145 98.4 136 25 155 97.3 137 25 165 96.7 138 25 175 97.2 139 25 185 97.2 141 25 205 95.1 142 25 215 94.7 146 25 255 98.4 147 25 265 97.2 148 25 275 97.1 149 25 285 97.6 150 25 295 97.2 151 25 305 96.4 152 25 315 95.4 155 25 345 98.1 163 15 65 99.2 164 15 75 98.3 165 15 85 99.3 166 15 95 98.3 167 15 105 99.2 168 15 115 99.1 169 15 125 98.7 170 15 135 98.8 171 15 145 98.5 179 15 225 98.3 180 15 235 98.6 181 15 245 99.6 182 15 255 98.4 183 15 265 98.6 184 15 275 98.1 185 15 285 97.3 186 15 295 95.7 187 15 305 96.6 190 15 335 98.5 191 15 345 98.7 193 5 5 99.2 199 5 65 97.8 200 5 75 98.8 201 5 85 98.0 202 5 95 98.6 203 5 105 99.2 204 5 115 98.8 205 5 125 98.7 206 5 135 99.0 207 5 145 99.4 208 5 155 98.7 218 5 255 97.8 219 5 265 98.8 220 5 275 98.6 221 5 285 98.8 223 5 305 97.1 224 5 315 97.6 225 5 325 98.4 226 5 335 99.1 227 5 345 99.1 228 5 355 99.1 236 -5 75 97.6 237 -5 85 98.6 238 -5 95 98.9 244 -5 155 98.9 256 -5 275 99.0 261 -5 325 96.8 264 -5 355 97.7 265 -15 5 96.4 273 -15 85 97.7 274 -15 95 98.0 280 -15 155 98.7 283 -15 185 98.4 297 -15 325 97.2 301 -25 5 95.3 310 -25 95 97.8 311 -25 105 97.5 312 -25 115 98.4 316 -25 155 97.8 317 -25 165 97.5 318 -25 175 98.8 319 -25 185 98.4 322 -25 215 99.4 323 -25 225 98.7 332 -25 315 98.8 337 -35 5 98.5 338 -35 15 97.6 339 -35 25 98.3 348 -35 115 97.7 349 -35 125 96.4 350 -35 135 97.9 351 -35 145 97.5 352 -35 155 97.5 353 -35 165 97.9 354 -35 175 98.5 355 -35 185 97.8 356 -35 195 97.6 357 -35 205 97.3 364 -35 275 99.4 367 -35 305 99.9 389 -45 165 99.8 390 -45 175 99.1 391 -45 185 96.9 400 -45 275 98.9 424 -55 310 99.3 425 -55 330 99.6