High Level (Cirriform) Amount-When-Present (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 32.6 Zonal Averages 15 zones Lat.N Average 85 35.9 75 38.0 65 33.9 55 35.0 45 33.5 35 32.3 25 29.9 15 35.7 5 33.2 -5 30.9 -15 28.3 -25 29.4 -35 33.0 -45 35.2 -55 35.7 Grid Box Averages 330 filled boxes Box # Lat.N Lon.E Average 1 85 60 27.6 2 85 180 44.2 3 85 300 33.5 4 75 20 33.4 5 75 60 32.6 6 75 100 34.2 7 75 140 41.7 8 75 180 45.3 9 75 220 41.2 10 75 260 35.5 11 75 300 33.3 12 75 340 33.2 13 65 10 31.4 14 65 30 32.3 15 65 50 31.8 20 65 150 28.7 21 65 170 34.7 22 65 190 33.4 23 65 210 32.8 25 65 250 39.0 26 65 270 35.9 27 65 290 39.4 28 65 310 32.7 29 65 330 31.8 30 65 350 34.0 31 55 10 34.5 32 55 30 35.4 37 55 130 29.0 38 55 150 33.9 39 55 170 34.7 40 55 190 34.4 41 55 210 32.6 42 55 230 31.8 44 55 270 35.0 45 55 290 38.1 46 55 310 37.1 47 55 330 38.2 48 55 350 34.7 49 45 5 33.9 50 45 15 33.2 51 45 25 37.5 52 45 35 37.1 53 45 45 26.7 54 45 55 33.7 62 45 135 37.1 63 45 145 36.7 64 45 155 33.0 65 45 165 31.4 66 45 175 35.1 67 45 185 36.4 68 45 195 33.4 69 45 205 32.5 70 45 215 30.7 71 45 225 31.1 72 45 235 30.1 77 45 285 39.4 78 45 295 38.4 79 45 305 35.7 80 45 315 36.5 81 45 325 32.1 82 45 335 31.5 83 45 345 30.3 84 45 355 31.4 85 35 5 35.7 86 35 15 35.3 87 35 25 37.4 88 35 35 34.8 90 35 55 31.7 96 35 115 36.5 97 35 125 38.6 98 35 135 39.6 99 35 145 34.7 100 35 155 32.8 101 35 165 39.7 102 35 175 31.5 103 35 185 30.1 104 35 195 28.1 105 35 205 28.1 106 35 215 27.1 107 35 225 29.7 108 35 235 27.8 109 35 245 31.9 112 35 275 37.1 113 35 285 39.1 114 35 295 34.5 115 35 305 29.4 116 35 315 28.9 117 35 325 25.7 118 35 335 27.1 119 35 345 30.9 120 35 355 33.8 124 25 35 38.0 125 25 45 45.1 126 25 55 49.3 127 25 65 50.2 129 25 85 37.8 131 25 105 48.2 132 25 115 34.0 133 25 125 33.6 134 25 135 31.7 135 25 145 27.7 136 25 155 28.8 137 25 165 29.9 138 25 175 29.0 139 25 185 27.8 140 25 195 26.9 141 25 205 27.4 142 25 215 26.9 143 25 225 26.8 144 25 235 24.9 145 25 245 26.5 146 25 255 28.7 147 25 265 29.6 148 25 275 29.1 149 25 285 30.4 150 25 295 29.7 151 25 305 28.3 152 25 315 26.6 153 25 325 28.3 154 25 335 40.1 155 25 345 45.7 160 15 35 46.0 161 15 45 49.8 162 15 55 46.3 163 15 65 45.2 164 15 75 45.3 165 15 85 43.3 166 15 95 42.7 167 15 105 52.2 168 15 115 34.9 169 15 125 35.1 170 15 135 31.9 171 15 145 29.3 172 15 155 33.1 173 15 165 40.0 174 15 175 35.2 175 15 185 32.7 176 15 195 32.4 177 15 205 27.7 178 15 215 28.5 179 15 225 25.6 180 15 235 29.6 181 15 245 28.3 182 15 255 32.2 183 15 265 36.0 184 15 275 35.6 185 15 285 35.5 186 15 295 33.9 187 15 305 35.5 188 15 315 37.9 189 15 325 41.2 190 15 335 46.9 191 15 345 50.5 193 5 5 33.8 197 5 45 35.4 198 5 55 38.8 199 5 65 40.6 200 5 75 42.6 201 5 85 40.3 202 5 95 41.8 203 5 105 38.9 204 5 115 37.7 205 5 125 33.2 206 5 135 32.4 207 5 145 28.7 208 5 155 29.6 209 5 165 34.1 210 5 175 33.2 211 5 185 28.4 212 5 195 28.9 213 5 205 25.5 214 5 215 22.9 215 5 225 28.6 216 5 235 25.2 217 5 245 28.0 218 5 255 30.2 219 5 265 33.2 220 5 275 37.3 221 5 285 45.2 223 5 305 29.3 224 5 315 26.6 225 5 325 27.5 226 5 335 33.3 227 5 345 36.6 228 5 355 33.3 229 -5 5 37.2 230 -5 15 44.4 233 -5 45 29.1 234 -5 55 36.3 235 -5 65 38.0 236 -5 75 35.1 237 -5 85 34.8 238 -5 95 36.8 239 -5 105 35.3 240 -5 115 27.9 241 -5 125 28.4 242 -5 135 31.8 243 -5 145 30.6 244 -5 155 31.0 245 -5 165 29.2 246 -5 175 31.1 247 -5 185 26.5 248 -5 195 25.8 249 -5 205 24.5 250 -5 215 22.2 251 -5 225 19.7 252 -5 235 21.4 253 -5 245 22.8 254 -5 255 23.7 255 -5 265 24.8 256 -5 275 37.6 260 -5 315 21.4 261 -5 325 24.3 262 -5 335 26.1 263 -5 345 33.0 264 -5 355 32.9 265 -15 5 31.0 266 -15 15 40.5 268 -15 35 25.9 269 -15 45 20.6 270 -15 55 24.2 271 -15 65 25.4 272 -15 75 30.3 273 -15 85 29.9 274 -15 95 28.5 275 -15 105 27.3 276 -15 115 23.9 277 -15 125 29.9 278 -15 135 30.6 279 -15 145 29.9 280 -15 155 28.6 281 -15 165 31.0 282 -15 175 29.5 283 -15 185 31.1 284 -15 195 26.6 285 -15 205 22.4 286 -15 215 22.0 287 -15 225 24.1 288 -15 235 23.7 289 -15 245 24.6 290 -15 255 21.1 291 -15 265 31.1 292 -15 275 44.2 293 -15 285 46.0 297 -15 325 25.8 298 -15 335 24.6 299 -15 345 27.4 300 -15 355 29.5 301 -25 5 29.4 302 -25 15 31.5 304 -25 35 28.4 305 -25 45 25.0 306 -25 55 23.0 307 -25 65 28.3 308 -25 75 26.5 309 -25 85 26.8 310 -25 95 25.9 311 -25 105 25.5 312 -25 115 25.2 315 -25 145 24.0 316 -25 155 24.9 317 -25 165 25.4 318 -25 175 27.5 319 -25 185 31.1 320 -25 195 30.3 321 -25 205 33.3 322 -25 215 28.8 323 -25 225 31.2 324 -25 235 29.2 325 -25 245 33.3 326 -25 255 31.3 328 -25 275 29.9 329 -25 285 31.8 332 -25 315 33.0 333 -25 325 29.5 334 -25 335 29.6 335 -25 345 29.1 336 -25 355 31.2 337 -35 5 36.6 338 -35 15 32.9 339 -35 25 32.7 340 -35 35 31.1 341 -35 45 27.5 342 -35 55 30.6 343 -35 65 27.8 344 -35 75 28.9 345 -35 85 31.2 346 -35 95 33.1 347 -35 105 29.6 348 -35 115 31.7 349 -35 125 32.6 350 -35 135 33.7 351 -35 145 33.9 352 -35 155 30.0 353 -35 165 29.7 354 -35 175 31.1 355 -35 185 32.1 356 -35 195 33.2 357 -35 205 32.6 358 -35 215 33.9 359 -35 225 38.6 360 -35 235 38.3 364 -35 275 38.5 365 -35 285 37.9 367 -35 305 35.1 368 -35 315 35.6 369 -35 325 34.4 370 -35 335 33.0 371 -35 345 31.2 372 -35 355 31.5 380 -45 75 36.3 387 -45 145 32.5 388 -45 155 32.3 389 -45 165 35.3 390 -45 175 30.5 391 -45 185 27.1 393 -45 205 30.0 394 -45 215 35.8 397 -45 245 42.8 398 -45 255 34.8 400 -45 275 41.2 401 -45 285 40.9 402 -45 295 38.3 403 -45 305 39.2 404 -45 315 38.2 405 -45 325 34.2 417 -55 170 37.7 423 -55 290 36.1 424 -55 310 34.9 425 -55 330 33.3