Nimbostratus Amount-When-Present (%) September, October, November (1954 - 1997) , Ship Observations Only Global Average: 98.6 Zonal Averages 17 zones Lat.N Average 85 98.2 75 98.8 65 99.3 55 99.2 45 99.3 35 98.9 25 98.0 15 98.2 5 98.5 -5 98.3 -15 97.7 -25 98.7 -35 99.0 -45 99.1 -55 99.2 -65 99.0 -75 98.8 Grid Box Averages 323 filled boxes Box # Lat.N Lon.E Average 1 85 60 98.4 2 85 180 97.6 3 85 300 98.8 4 75 20 99.0 5 75 60 98.9 6 75 100 99.6 7 75 140 99.2 8 75 180 98.5 9 75 220 98.5 10 75 260 98.6 11 75 300 98.4 12 75 340 99.5 13 65 10 99.1 14 65 30 98.4 15 65 50 99.0 16 65 70 98.7 21 65 170 99.7 22 65 190 99.6 23 65 210 99.8 25 65 250 99.4 26 65 270 99.2 27 65 290 99.3 28 65 310 99.1 29 65 330 99.3 30 65 350 99.3 31 55 10 99.0 32 55 30 99.4 38 55 150 99.2 39 55 170 99.3 40 55 190 99.3 41 55 210 99.2 42 55 230 99.2 44 55 270 98.3 45 55 290 99.8 46 55 310 99.3 47 55 330 99.2 48 55 350 99.0 49 45 5 98.1 50 45 15 97.9 51 45 25 98.5 52 45 35 97.7 62 45 135 99.5 63 45 145 99.4 64 45 155 99.4 65 45 165 99.5 66 45 175 99.4 67 45 185 99.4 68 45 195 99.3 69 45 205 99.3 70 45 215 99.4 71 45 225 99.3 72 45 235 99.2 77 45 285 99.5 78 45 295 99.6 79 45 305 99.4 80 45 315 99.4 81 45 325 99.0 82 45 335 98.9 83 45 345 98.8 84 45 355 98.6 85 35 5 97.4 86 35 15 97.3 87 35 25 97.9 88 35 35 96.0 97 35 125 99.2 98 35 135 99.2 99 35 145 99.3 100 35 155 99.3 101 35 165 99.2 102 35 175 99.0 103 35 185 99.3 104 35 195 99.1 105 35 205 98.9 106 35 215 98.7 107 35 225 98.5 108 35 235 98.5 109 35 245 98.5 112 35 275 97.2 113 35 285 99.0 114 35 295 98.8 115 35 305 98.4 116 35 315 98.2 117 35 325 98.4 118 35 335 98.5 119 35 345 97.7 120 35 355 97.8 132 25 115 99.0 133 25 125 99.0 134 25 135 98.8 135 25 145 98.7 136 25 155 98.9 137 25 165 97.5 138 25 175 98.0 139 25 185 98.0 140 25 195 97.0 141 25 205 96.7 142 25 215 96.0 143 25 225 97.3 144 25 235 97.8 145 25 245 97.8 146 25 255 98.6 147 25 265 97.9 148 25 275 98.0 149 25 285 97.9 150 25 295 98.1 151 25 305 98.0 152 25 315 97.8 153 25 325 97.1 154 25 335 96.8 155 25 345 98.2 162 15 55 97.8 163 15 65 95.4 164 15 75 98.0 165 15 85 97.8 166 15 95 98.1 167 15 105 98.8 168 15 115 98.9 169 15 125 98.7 170 15 135 98.5 171 15 145 98.0 172 15 155 98.0 173 15 165 99.2 174 15 175 98.6 175 15 185 97.6 176 15 195 96.3 177 15 205 97.6 178 15 215 97.3 179 15 225 98.1 180 15 235 98.5 181 15 245 98.5 182 15 255 98.8 183 15 265 98.9 184 15 275 98.3 185 15 285 97.2 186 15 295 96.9 187 15 305 97.3 188 15 315 97.8 189 15 325 99.5 190 15 335 98.5 191 15 345 98.3 193 5 5 98.0 198 5 55 97.1 199 5 65 97.5 200 5 75 97.9 201 5 85 98.2 202 5 95 98.5 203 5 105 98.5 204 5 115 98.7 205 5 125 98.5 206 5 135 98.8 207 5 145 98.7 208 5 155 98.2 209 5 165 97.2 210 5 175 99.1 211 5 185 98.8 212 5 195 97.9 213 5 205 97.9 214 5 215 98.8 215 5 225 98.9 216 5 235 99.3 217 5 245 98.8 218 5 255 98.5 219 5 265 98.6 220 5 275 98.7 221 5 285 98.2 223 5 305 97.1 224 5 315 96.7 225 5 325 98.2 226 5 335 98.7 227 5 345 98.4 228 5 355 97.9 229 -5 5 98.7 230 -5 15 99.2 233 -5 45 97.4 234 -5 55 97.1 235 -5 65 98.8 236 -5 75 98.3 237 -5 85 99.0 238 -5 95 98.7 239 -5 105 97.9 240 -5 115 98.1 241 -5 125 97.9 242 -5 135 98.9 243 -5 145 98.0 244 -5 155 98.3 245 -5 165 98.9 254 -5 255 93.6 255 -5 265 96.7 256 -5 275 98.5 261 -5 325 96.2 264 -5 355 97.9 265 -15 5 98.5 266 -15 15 99.3 269 -15 45 98.6 270 -15 55 95.7 271 -15 65 97.0 272 -15 75 98.7 273 -15 85 97.7 274 -15 95 98.6 275 -15 105 94.7 279 -15 145 97.5 280 -15 155 98.3 281 -15 165 98.3 282 -15 175 98.6 283 -15 185 98.3 284 -15 195 98.0 285 -15 205 98.0 286 -15 215 97.7 287 -15 225 96.6 289 -15 245 95.6 290 -15 255 92.2 297 -15 325 98.2 299 -15 345 95.8 300 -15 355 97.4 301 -25 5 96.5 302 -25 15 98.3 304 -25 35 99.3 305 -25 45 98.7 306 -25 55 98.8 307 -25 65 98.6 308 -25 75 98.5 309 -25 85 98.2 310 -25 95 97.4 311 -25 105 96.7 312 -25 115 96.1 316 -25 155 98.6 317 -25 165 98.4 318 -25 175 98.8 319 -25 185 99.5 320 -25 195 99.3 321 -25 205 98.9 322 -25 215 99.1 323 -25 225 98.4 324 -25 235 98.4 332 -25 315 99.3 333 -25 325 98.4 334 -25 335 99.4 335 -25 345 98.8 336 -25 355 96.4 337 -35 5 98.2 338 -35 15 98.0 339 -35 25 98.0 340 -35 35 99.0 341 -35 45 98.8 342 -35 55 99.1 343 -35 65 99.2 344 -35 75 98.8 345 -35 85 98.5 346 -35 95 99.0 347 -35 105 97.9 348 -35 115 97.1 349 -35 125 97.8 350 -35 135 97.4 351 -35 145 98.0 352 -35 155 98.5 353 -35 165 98.8 354 -35 175 99.1 355 -35 185 99.0 356 -35 195 99.2 357 -35 205 99.3 358 -35 215 99.1 359 -35 225 99.0 360 -35 235 99.4 364 -35 275 99.2 365 -35 285 99.0 367 -35 305 99.4 368 -35 315 99.1 369 -35 325 99.5 370 -35 335 99.6 371 -35 345 99.3 372 -35 355 98.8 378 -45 55 99.2 379 -45 65 99.9 380 -45 75 99.5 381 -45 85 98.9 382 -45 95 99.1 383 -45 105 99.3 384 -45 115 99.8 386 -45 135 98.3 387 -45 145 98.4 388 -45 155 99.0 389 -45 165 99.1 390 -45 175 99.1 391 -45 185 98.6 392 -45 195 99.3 393 -45 205 99.4 400 -45 275 99.6 401 -45 285 99.1 402 -45 295 98.9 403 -45 305 99.5 404 -45 315 98.3 405 -45 325 98.3 407 -45 345 99.2 408 -45 355 99.3 409 -55 10 99.4 410 -55 30 97.1 411 -55 50 98.9 412 -55 70 99.4 413 -55 90 99.9 414 -55 110 99.5 415 -55 130 99.9 416 -55 150 98.9 417 -55 170 99.4 420 -55 230 100.0 421 -55 250 99.1 422 -55 270 98.4 423 -55 290 99.5 424 -55 310 99.1 425 -55 330 99.3 426 -55 350 99.6 429 -65 50 96.2 430 -65 70 98.5 431 -65 90 98.4 432 -65 110 99.6 433 -65 130 99.9 434 -65 150 99.8 435 -65 170 99.5 436 -65 190 99.8 441 -65 290 99.2 442 -65 310 99.5 444 -65 350 98.6 449 -75 180 98.0 453 -75 340 99.5