Nimbostratus Amount-When-Present (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 98.4 Zonal Averages 15 zones Lat.N Average 85 98.2 75 98.8 65 99.4 55 99.6 45 99.5 35 99.0 25 98.0 15 98.5 5 98.4 -5 98.0 -15 97.3 -25 98.1 -35 98.2 -45 98.7 -55 99.0 Grid Box Averages 274 filled boxes Box # Lat.N Lon.E Average 1 85 60 98.4 2 85 180 97.8 3 85 300 98.5 4 75 20 99.0 5 75 60 98.9 6 75 100 99.6 7 75 140 98.9 8 75 180 98.0 9 75 220 99.2 10 75 260 99.3 11 75 300 99.0 12 75 340 99.2 13 65 10 99.1 14 65 30 99.2 15 65 50 98.8 21 65 170 99.7 22 65 190 99.7 23 65 210 99.8 25 65 250 99.2 26 65 270 99.5 27 65 290 99.6 28 65 310 99.5 29 65 330 99.4 30 65 350 99.3 31 55 10 99.0 32 55 30 99.7 38 55 150 99.8 39 55 170 99.8 40 55 190 99.7 41 55 210 99.7 42 55 230 99.5 45 55 290 99.4 46 55 310 99.6 47 55 330 99.4 48 55 350 99.0 49 45 5 97.5 50 45 15 94.8 52 45 35 98.6 62 45 135 99.7 63 45 145 99.7 64 45 155 99.8 65 45 165 99.8 66 45 175 99.8 67 45 185 99.8 68 45 195 99.7 69 45 205 99.6 70 45 215 99.4 71 45 225 99.3 72 45 235 99.2 77 45 285 99.0 78 45 295 99.3 79 45 305 99.5 80 45 315 99.5 81 45 325 99.3 82 45 335 99.0 83 45 345 99.0 84 45 355 98.9 85 35 5 97.9 86 35 15 96.0 97 35 125 99.2 98 35 135 99.3 99 35 145 99.5 100 35 155 99.5 101 35 165 99.5 102 35 175 99.3 103 35 185 99.4 104 35 195 99.2 105 35 205 98.7 106 35 215 98.2 107 35 225 97.5 108 35 235 97.4 113 35 285 98.8 114 35 295 98.7 115 35 305 98.6 116 35 315 98.3 117 35 325 98.0 118 35 335 97.5 119 35 345 97.3 120 35 355 97.1 127 25 65 99.5 132 25 115 98.8 133 25 125 99.1 134 25 135 99.0 135 25 145 98.8 136 25 155 98.2 137 25 165 98.3 138 25 175 98.5 139 25 185 97.8 140 25 195 95.5 141 25 205 93.0 142 25 215 95.2 143 25 225 95.4 144 25 235 97.7 145 25 245 98.1 146 25 255 98.5 147 25 265 98.3 148 25 275 97.8 149 25 285 97.4 150 25 295 97.4 151 25 305 97.4 152 25 315 95.2 155 25 345 96.9 162 15 55 97.8 163 15 65 98.7 164 15 75 98.6 165 15 85 99.0 166 15 95 99.7 167 15 105 98.1 168 15 115 99.1 169 15 125 98.9 170 15 135 98.8 171 15 145 98.5 172 15 155 97.7 173 15 165 98.4 177 15 205 96.8 178 15 215 97.1 179 15 225 97.1 180 15 235 97.2 181 15 245 99.0 182 15 255 98.8 183 15 265 98.8 184 15 275 98.0 185 15 285 97.5 186 15 295 96.2 187 15 305 96.4 188 15 315 97.3 189 15 325 98.6 190 15 335 98.1 191 15 345 98.3 193 5 5 99.0 198 5 55 95.8 199 5 65 98.2 200 5 75 98.5 201 5 85 98.5 202 5 95 98.7 203 5 105 98.6 204 5 115 98.6 205 5 125 98.7 206 5 135 97.8 207 5 145 98.3 208 5 155 98.3 209 5 165 99.1 212 5 195 97.7 213 5 205 98.8 214 5 215 98.0 215 5 225 98.8 216 5 235 98.6 217 5 245 98.5 218 5 255 98.8 219 5 265 98.2 220 5 275 98.8 221 5 285 98.8 223 5 305 97.8 224 5 315 97.8 225 5 325 97.8 226 5 335 98.3 227 5 345 98.5 228 5 355 98.4 233 -5 45 96.9 234 -5 55 97.4 235 -5 65 97.5 236 -5 75 98.3 237 -5 85 98.7 238 -5 95 99.0 239 -5 105 98.5 240 -5 115 97.2 241 -5 125 97.5 242 -5 135 97.4 243 -5 145 98.5 244 -5 155 98.2 245 -5 165 97.7 261 -5 325 96.6 262 -5 335 95.6 264 -5 355 95.5 265 -15 5 96.4 269 -15 45 95.1 270 -15 55 96.5 271 -15 65 95.9 272 -15 75 97.5 273 -15 85 97.7 274 -15 95 98.0 275 -15 105 96.3 276 -15 115 98.0 279 -15 145 97.5 280 -15 155 98.0 281 -15 165 98.2 282 -15 175 98.6 283 -15 185 97.2 284 -15 195 98.2 285 -15 205 97.5 286 -15 215 97.4 289 -15 245 94.4 297 -15 325 96.0 299 -15 345 94.4 300 -15 355 96.4 301 -25 5 95.5 302 -25 15 97.9 304 -25 35 97.1 305 -25 45 94.5 306 -25 55 95.3 307 -25 65 95.7 308 -25 75 97.0 309 -25 85 98.5 310 -25 95 98.0 311 -25 105 97.6 312 -25 115 97.5 316 -25 155 97.9 317 -25 165 98.5 318 -25 175 98.5 319 -25 185 98.6 320 -25 195 99.0 321 -25 205 99.1 322 -25 215 98.7 323 -25 225 98.7 324 -25 235 98.3 332 -25 315 98.9 333 -25 325 97.3 334 -25 335 98.3 335 -25 345 97.2 336 -25 355 96.7 337 -35 5 98.2 338 -35 15 98.0 339 -35 25 97.3 340 -35 35 97.8 341 -35 45 97.0 342 -35 55 97.4 343 -35 65 97.6 344 -35 75 97.6 345 -35 85 97.9 346 -35 95 96.3 347 -35 105 96.7 348 -35 115 96.0 349 -35 125 96.9 350 -35 135 96.2 351 -35 145 97.0 352 -35 155 97.5 353 -35 165 97.3 354 -35 175 98.5 355 -35 185 98.5 356 -35 195 98.6 357 -35 205 98.7 358 -35 215 98.7 359 -35 225 98.6 360 -35 235 99.4 364 -35 275 99.3 365 -35 285 99.2 367 -35 305 99.0 368 -35 315 99.0 369 -35 325 98.9 370 -35 335 99.2 371 -35 345 99.4 372 -35 355 97.7 380 -45 75 99.4 387 -45 145 96.9 388 -45 155 97.3 389 -45 165 98.0 390 -45 175 99.0 391 -45 185 98.1 392 -45 195 98.8 393 -45 205 98.7 394 -45 215 99.2 397 -45 245 99.1 398 -45 255 98.6 400 -45 275 99.2 401 -45 285 99.1 402 -45 295 98.0 403 -45 305 99.2 404 -45 315 98.4 405 -45 325 99.4 412 -55 70 99.4 417 -55 170 98.8 423 -55 290 98.5 424 -55 310 98.8 425 -55 330 99.0