Nimbostratus Amount-When-Present (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 98.4 Zonal Averages 15 zones Lat.N Average 85 98.3 75 99.0 65 99.3 55 99.6 45 99.6 35 99.1 25 97.8 15 98.4 5 98.4 -5 98.2 -15 97.3 -25 98.2 -35 98.4 -45 99.0 -55 98.5 Grid Box Averages 301 filled boxes Box # Lat.N Lon.E Average 1 85 60 98.3 2 85 180 98.1 3 85 300 98.8 4 75 20 99.0 5 75 60 98.9 6 75 100 99.8 7 75 140 98.7 8 75 180 98.7 9 75 220 99.0 10 75 260 99.4 11 75 300 99.2 12 75 340 99.4 13 65 10 99.1 14 65 30 98.9 15 65 50 98.7 20 65 150 99.6 21 65 170 99.8 22 65 190 99.6 23 65 210 99.7 25 65 250 98.8 26 65 270 98.4 27 65 290 99.5 28 65 310 99.4 29 65 330 99.4 30 65 350 99.4 31 55 10 99.0 32 55 30 99.5 37 55 130 99.4 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 44 55 270 99.5 45 55 290 99.5 46 55 310 99.6 47 55 330 99.5 48 55 350 99.1 49 45 5 97.0 50 45 15 96.8 51 45 25 96.2 52 45 35 97.6 62 45 135 99.8 63 45 145 99.8 64 45 155 99.8 65 45 165 99.8 66 45 175 99.8 67 45 185 99.8 68 45 195 99.8 69 45 205 99.7 70 45 215 99.5 71 45 225 99.3 72 45 235 99.2 77 45 285 99.0 78 45 295 99.4 79 45 305 99.5 80 45 315 99.6 81 45 325 99.4 82 45 335 99.1 83 45 345 99.0 84 45 355 98.8 85 35 5 97.7 86 35 15 95.1 87 35 25 94.9 97 35 125 99.3 98 35 135 99.3 99 35 145 99.5 100 35 155 99.6 101 35 165 99.5 102 35 175 99.3 103 35 185 99.4 104 35 195 99.2 105 35 205 98.8 106 35 215 98.3 107 35 225 98.0 108 35 235 98.3 109 35 245 98.8 112 35 275 99.5 113 35 285 98.7 114 35 295 98.6 115 35 305 98.3 116 35 315 98.5 117 35 325 98.3 118 35 335 97.9 119 35 345 97.5 120 35 355 97.5 127 25 65 99.0 132 25 115 98.3 133 25 125 99.0 134 25 135 99.0 135 25 145 98.6 136 25 155 97.8 137 25 165 97.4 138 25 175 97.8 139 25 185 97.5 140 25 195 95.1 141 25 205 94.2 142 25 215 94.9 143 25 225 97.1 144 25 235 97.8 145 25 245 98.7 146 25 255 98.5 147 25 265 97.8 148 25 275 97.5 149 25 285 97.5 150 25 295 97.3 151 25 305 96.9 152 25 315 95.3 153 25 325 94.9 155 25 345 97.8 161 15 45 96.7 162 15 55 98.1 163 15 65 98.9 164 15 75 98.4 165 15 85 99.1 166 15 95 99.0 167 15 105 98.6 168 15 115 99.1 169 15 125 98.8 170 15 135 98.8 171 15 145 98.5 172 15 155 98.1 173 15 165 98.2 174 15 175 96.0 176 15 195 96.7 177 15 205 96.9 178 15 215 97.3 179 15 225 97.8 180 15 235 98.0 181 15 245 99.3 182 15 255 98.6 183 15 265 98.7 184 15 275 98.0 185 15 285 97.4 186 15 295 96.0 187 15 305 96.5 188 15 315 97.2 189 15 325 98.6 190 15 335 98.3 191 15 345 98.5 193 5 5 99.1 198 5 55 95.9 199 5 65 98.0 200 5 75 98.6 201 5 85 98.3 202 5 95 98.6 203 5 105 98.9 204 5 115 98.7 205 5 125 98.7 206 5 135 98.3 207 5 145 98.8 208 5 155 98.5 209 5 165 98.5 210 5 175 97.1 211 5 185 97.2 212 5 195 98.0 213 5 205 98.9 214 5 215 97.5 215 5 225 98.8 216 5 235 98.5 217 5 245 99.0 218 5 255 98.3 219 5 265 98.5 220 5 275 98.7 221 5 285 98.8 223 5 305 97.4 224 5 315 97.7 225 5 325 98.1 226 5 335 98.7 227 5 345 98.8 228 5 355 98.8 233 -5 45 96.3 234 -5 55 98.9 235 -5 65 98.5 236 -5 75 98.0 237 -5 85 98.7 238 -5 95 98.9 239 -5 105 98.7 240 -5 115 97.6 241 -5 125 97.7 242 -5 135 98.0 243 -5 145 98.6 244 -5 155 98.6 245 -5 165 97.8 255 -5 265 96.2 256 -5 275 98.6 261 -5 325 96.7 262 -5 335 96.1 264 -5 355 96.9 265 -15 5 96.4 266 -15 15 100.0 269 -15 45 95.4 270 -15 55 97.0 271 -15 65 96.6 272 -15 75 97.9 273 -15 85 97.7 274 -15 95 98.0 275 -15 105 97.7 276 -15 115 97.9 279 -15 145 98.2 280 -15 155 98.4 281 -15 165 98.8 282 -15 175 97.6 283 -15 185 97.8 284 -15 195 97.1 285 -15 205 97.1 286 -15 215 97.0 287 -15 225 96.5 288 -15 235 96.3 289 -15 245 94.5 290 -15 255 93.9 297 -15 325 96.6 299 -15 345 94.4 300 -15 355 95.5 301 -25 5 95.4 302 -25 15 98.4 304 -25 35 97.2 305 -25 45 96.6 306 -25 55 96.4 307 -25 65 96.1 308 -25 75 97.5 309 -25 85 98.2 310 -25 95 97.8 311 -25 105 97.5 312 -25 115 98.0 316 -25 155 97.9 317 -25 165 98.0 318 -25 175 98.7 319 -25 185 98.5 320 -25 195 99.2 321 -25 205 98.9 322 -25 215 99.0 323 -25 225 98.7 324 -25 235 98.4 325 -25 245 98.2 332 -25 315 98.9 333 -25 325 97.7 334 -25 335 98.1 335 -25 345 97.2 336 -25 355 97.1 337 -35 5 98.4 338 -35 15 97.8 339 -35 25 97.8 340 -35 35 98.5 341 -35 45 97.3 342 -35 55 98.2 343 -35 65 97.9 344 -35 75 97.7 345 -35 85 97.5 346 -35 95 97.7 347 -35 105 97.3 348 -35 115 96.8 349 -35 125 96.6 350 -35 135 97.1 351 -35 145 97.3 352 -35 155 97.5 353 -35 165 97.6 354 -35 175 98.5 355 -35 185 98.2 356 -35 195 98.1 357 -35 205 98.0 358 -35 215 99.2 359 -35 225 98.7 360 -35 235 99.1 362 -35 255 99.3 364 -35 275 99.3 365 -35 285 98.4 367 -35 305 99.5 368 -35 315 99.1 369 -35 325 99.5 370 -35 335 99.6 371 -35 345 99.1 372 -35 355 97.9 379 -45 65 99.5 380 -45 75 99.5 387 -45 145 97.5 388 -45 155 97.7 389 -45 165 98.9 390 -45 175 99.0 391 -45 185 97.5 392 -45 195 98.6 393 -45 205 98.8 394 -45 215 99.2 396 -45 235 99.2 397 -45 245 99.2 398 -45 255 99.3 399 -45 265 99.6 400 -45 275 99.0 401 -45 285 99.5 402 -45 295 98.0 403 -45 305 99.5 404 -45 315 98.3 405 -45 325 99.4 411 -55 50 99.2 412 -55 70 99.5 417 -55 170 98.9 420 -55 230 97.2 422 -55 270 96.7 423 -55 290 99.1 424 -55 310 99.1 425 -55 330 99.4