High Level (Cirriform) Frequency of Occurrence (%) August (1954 - 1997) Day, Ship Observations Only Global Average: 38.1 Zonal Averages 15 zones Lat.N Average 85 53.1 75 46.2 65 49.0 55 48.7 45 46.5 35 38.2 25 40.4 15 51.0 5 53.1 -5 37.7 -15 25.7 -25 26.2 -35 30.9 -45 34.1 -55 29.1 Grid Box Averages 335 filled boxes Box # Lat.N Lon.E Average 1 85 60 45.9 2 85 180 57.6 3 85 300 56.5 4 75 20 41.1 5 75 60 42.6 6 75 100 39.4 7 75 140 41.4 8 75 180 49.9 9 75 220 51.6 10 75 260 51.8 11 75 300 53.0 12 75 340 48.3 13 65 10 45.8 14 65 30 41.5 15 65 50 40.7 20 65 150 44.2 21 65 170 41.0 22 65 190 47.7 23 65 210 55.2 24 65 230 41.6 25 65 250 57.8 26 65 270 56.2 27 65 290 56.8 28 65 310 54.1 29 65 330 49.3 30 65 350 46.0 31 55 10 45.3 32 55 30 44.5 37 55 130 38.9 38 55 150 41.8 39 55 170 46.0 40 55 190 51.1 41 55 210 50.1 42 55 230 49.0 44 55 270 58.4 45 55 290 58.3 46 55 310 50.9 47 55 330 46.6 48 55 350 51.1 49 45 5 35.8 50 45 15 20.8 51 45 25 12.6 52 45 35 12.4 53 45 45 21.3 54 45 55 19.3 62 45 135 47.7 63 45 145 47.1 64 45 155 52.9 65 45 165 53.3 66 45 175 53.4 67 45 185 54.5 68 45 195 53.3 69 45 205 51.0 70 45 215 51.0 71 45 225 42.5 72 45 235 36.8 77 45 285 46.3 78 45 295 51.0 79 45 305 48.8 80 45 315 47.3 81 45 325 43.9 82 45 335 40.9 83 45 345 39.5 84 45 355 41.5 85 35 5 23.8 86 35 15 13.5 87 35 25 6.2 88 35 35 5.7 90 35 55 20.4 96 35 115 38.1 97 35 125 42.2 98 35 135 53.7 99 35 145 53.3 100 35 155 52.0 101 35 165 55.1 102 35 175 51.3 103 35 185 49.9 104 35 195 43.0 105 35 205 42.5 106 35 215 36.5 107 35 225 28.8 108 35 235 24.1 109 35 245 19.2 112 35 275 58.1 113 35 285 50.9 114 35 295 46.8 115 35 305 43.0 116 35 315 36.3 117 35 325 29.7 118 35 335 27.3 119 35 345 18.9 120 35 355 21.0 124 25 35 15.5 125 25 45 5.6 126 25 55 18.9 127 25 65 32.5 129 25 85 63.1 131 25 105 48.4 132 25 115 56.3 133 25 125 54.3 134 25 135 58.4 135 25 145 57.5 136 25 155 55.6 137 25 165 54.8 138 25 175 52.2 139 25 185 46.7 140 25 195 38.3 141 25 205 31.7 142 25 215 28.1 143 25 225 29.3 144 25 235 29.8 145 25 245 40.1 146 25 255 57.4 147 25 265 58.2 148 25 275 60.8 149 25 285 50.3 150 25 295 41.6 151 25 305 32.3 152 25 315 23.1 153 25 325 17.8 154 25 335 17.4 155 25 345 18.3 160 15 35 28.2 161 15 45 29.6 162 15 55 30.5 163 15 65 42.8 164 15 75 53.8 165 15 85 64.1 166 15 95 65.0 167 15 105 70.1 168 15 115 64.8 169 15 125 67.8 170 15 135 70.6 171 15 145 70.2 172 15 155 64.8 173 15 165 52.9 174 15 175 51.3 175 15 185 48.2 176 15 195 41.6 177 15 205 38.6 178 15 215 42.3 179 15 225 44.2 180 15 235 46.2 181 15 245 53.9 182 15 255 67.2 183 15 265 71.1 184 15 275 64.9 185 15 285 54.9 186 15 295 44.5 187 15 305 36.8 188 15 315 33.0 189 15 325 31.9 190 15 335 36.5 191 15 345 45.2 193 5 5 40.8 197 5 45 40.6 198 5 55 41.5 199 5 65 56.8 200 5 75 64.6 201 5 85 68.7 202 5 95 72.3 203 5 105 66.2 204 5 115 70.8 205 5 125 67.9 206 5 135 69.3 207 5 145 69.6 208 5 155 68.1 209 5 165 61.1 210 5 175 63.9 211 5 185 51.4 212 5 195 47.0 213 5 205 43.7 214 5 215 42.9 215 5 225 38.2 216 5 235 44.3 217 5 245 50.0 218 5 255 48.0 219 5 265 54.9 220 5 275 66.9 221 5 285 69.5 223 5 305 43.9 224 5 315 35.9 225 5 325 29.1 226 5 335 39.5 227 5 345 40.5 228 5 355 30.3 229 -5 5 27.2 230 -5 15 19.6 232 -5 35 22.4 233 -5 45 32.4 234 -5 55 48.6 235 -5 65 63.1 236 -5 75 61.6 237 -5 85 71.0 238 -5 95 63.9 239 -5 105 51.8 240 -5 115 42.7 241 -5 125 42.0 242 -5 135 45.5 243 -5 145 58.1 244 -5 155 63.1 245 -5 165 57.3 246 -5 175 55.6 247 -5 185 48.3 248 -5 195 35.3 249 -5 205 28.8 250 -5 215 23.9 251 -5 225 13.6 252 -5 235 14.9 253 -5 245 16.8 254 -5 255 20.6 255 -5 265 22.0 256 -5 275 28.7 260 -5 315 21.6 261 -5 325 21.2 262 -5 335 19.9 263 -5 345 18.4 264 -5 355 19.3 265 -15 5 18.8 266 -15 15 18.8 268 -15 35 8.4 269 -15 45 14.5 270 -15 55 20.3 271 -15 65 22.4 272 -15 75 36.2 273 -15 85 33.8 274 -15 95 39.3 275 -15 105 29.9 276 -15 115 18.8 277 -15 125 20.7 278 -15 135 35.3 279 -15 145 28.4 280 -15 155 31.6 281 -15 165 33.5 282 -15 175 30.7 283 -15 185 36.1 284 -15 195 31.1 285 -15 205 24.8 286 -15 215 23.0 287 -15 225 18.8 288 -15 235 16.6 289 -15 245 18.2 290 -15 255 18.3 291 -15 265 17.7 292 -15 275 23.0 293 -15 285 28.1 297 -15 325 29.8 298 -15 335 31.1 299 -15 345 23.9 300 -15 355 24.2 301 -25 5 18.2 302 -25 15 17.6 304 -25 35 14.2 305 -25 45 15.4 306 -25 55 17.1 307 -25 65 20.0 308 -25 75 16.2 309 -25 85 18.5 310 -25 95 18.4 311 -25 105 20.1 312 -25 115 14.8 315 -25 145 15.5 316 -25 155 18.4 317 -25 165 22.8 318 -25 175 25.6 319 -25 185 28.0 320 -25 195 31.0 321 -25 205 38.6 322 -25 215 35.1 323 -25 225 37.4 324 -25 235 36.8 325 -25 245 33.9 326 -25 255 33.8 327 -25 265 23.4 328 -25 275 20.7 329 -25 285 27.7 332 -25 315 37.0 333 -25 325 34.7 334 -25 335 34.0 335 -25 345 32.4 336 -25 355 28.8 337 -35 5 37.7 338 -35 15 27.4 339 -35 25 30.5 340 -35 35 27.0 341 -35 45 28.8 342 -35 55 24.7 343 -35 65 28.3 344 -35 75 23.5 345 -35 85 17.9 346 -35 95 22.3 347 -35 105 22.8 348 -35 115 26.0 349 -35 125 30.2 350 -35 135 34.6 351 -35 145 39.3 352 -35 155 29.7 353 -35 165 28.9 354 -35 175 30.8 355 -35 185 31.1 356 -35 195 29.8 357 -35 205 32.5 358 -35 215 32.0 359 -35 225 40.7 360 -35 235 42.6 364 -35 275 24.6 365 -35 285 28.1 367 -35 305 40.9 368 -35 315 36.6 369 -35 325 36.4 370 -35 335 37.1 371 -35 345 37.9 372 -35 355 38.4 378 -45 55 24.7 379 -45 65 31.0 386 -45 135 47.6 387 -45 145 38.8 388 -45 155 42.9 389 -45 165 39.9 390 -45 175 39.1 391 -45 185 35.6 392 -45 195 21.1 393 -45 205 30.9 395 -45 225 25.9 400 -45 275 25.1 401 -45 285 30.3 402 -45 295 48.6 403 -45 305 39.5 404 -45 315 38.5 405 -45 325 26.1 412 -55 70 17.1 417 -55 170 31.1 423 -55 290 43.9 424 -55 310 30.0 425 -55 330 25.9