Industry News

October Heating Degree Days

A heating degree day (HDD) is a measure of how cold a location is. It’s derived by comparing the average outdoor temperature to a baseline of 65 degrees. An outdoor temperature of 65 degrees is considered a balancing point at which homeowners don’t need heating to be comfortable indoors.  Monthly HDD data is calculated by summing the total number of HDDs that occur on each day of that month. More extreme cold temperatures result in a higher number of HDDs. Heating degree days have a direct impact on space and water heating fuel demand by propane customers. 

The below data set details the number of HDDs that have occurred in the month of October during the past 10 years, as well as the month’s 10-year average, broken down by state.

October

State 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 10-Year Average
Alabama 52 97 74 71 82 71 175 99 82 95 90
Arkansas 68 137 148 189 214 95 166 120 81 95 131
Arizona 19 23 71 62 19 67 53 29 14 33 39
California 127 87 112 141 41 171 86 95 54 139 105
Colorado 399 580 625 758 588 512 521 541 374 480 538
Connecticut 335 195 373 332 347 243 370 270 325 348 314
Delaware 190 137 196 167 203 125 309 200 211 236 197
Florida 2 2 1 0 1 2 7 4 3 4 3
Georgia 74 102 82 64 80 81 188 116 92 124 100
Idaho 493 626 557 776 510 510 434 492 432 533 536
Illinois 254 273 412 411 465 219 407 323 251 249 326
Indiana 215 254 335 316 386 195 389 291 256 262 290
Iowa 308 362 510 548 580 304 457 364 280 272 399
Kansas 151 222 323 399 369 188 240 216 132 142 238
Kentucky 137 206 218 193 246 143 320 208 196 205 207
Louisiana 16 30 18 29 36 15 60 27 18 17 27
Maine 501 336 630 513 553 398 442 358 480 449 466
Maryland 198 154 212 181 210 122 327 196 231 255 209
Massachusetts 369 220 437 367 367 254 361 264 366 364 337
Michigan 348 319 485 443 520 258 448 380 341 352 389
Minnesota 493 528 719 668 779 403 536 507 402 418 545
Mississippi 39 76 61 70 80 49 128 68 56 55 68
Missouri 159 222 296 362 378 190 310 229 173 158 248
Montana 662 733 733 946 783 642 574 703 553 689 702
Nebraska 287 377 502 565 523 320 374 359 235 244 379
Nevada 144 180 201 276 109 226 118 153 101 172 168
New Hampshire 501 319 586 502 522 372 482 362 489 468 460
New Jersey 281 179 296 242 276 170 356 229 257 297 258
New Mexico 169 248 315 358 239 277 325 219 147 192 249
New York 331 213 387 328 358 222 381 274 317 343 315
North Carolina 123 130 136 96 127 100 251 162 158 196 148
North Dakota 581 611 805 841 843 503 590 651 469 496 639
Ohio 249 257 341 279 366 184 404 297 286 314 298
Oklahoma 58 140 178 244 220 100 142 136 49 67 133
Oregon 421 429 368 534 353 458 248 360 358 447 398
Pennsylvania 314 238 341 302 345 208 439 302 325 362 318
Rhode Island 322 184 381 322 326 216 329 261 322 332 300
South Carolina 69 75 66 45 62 65 169 111 93 126 88
South Dakota 422 518 663 740 716 422 484 521 359 380 523
Tennessee 107 172 167 153 180 125 283 171 158 169 169
Texas 13 44 54 61 59 19 47 31 7 11 35
Utah 435 607 587 769 466 566 475 506 351 512 527
Vermont 525 366 622 538 561 408 523 402 513 515 497
Virginia 188 165 198 168 203 126 333 203 217 259 206
Washington 437 486 463 576 435 494 308 410 426 460 450
West Virginia 241 235 295 233 296 189 440 285 294 323 283
Wisconsin 397 395 581 560 655 315 511 429 361 368 457
Wyoming 538 716 728 928 723 628 611 657 478 602 661

 

Use the slider above to scroll through all the data. Additional HDD data can be found under the Supply and Logistics section on the Member Dashboard of NPGA’s website. For more information, contact NPGA’s Senior Director of State Advocacy & Affairs, Jacob Peterson.

SEPTEMBER 24, 2026

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