Heating demand in Virginia typically begins in October, the month when the state’s reference station near Virginia Beach sees its average temperature drop below the 65°F line that NOAA uses to track heating need. Demand peaks in January and the season stretches roughly seven months, easing off as spring averages climb back above that threshold in May.
When the heating season starts in Virginia
That 65°F line isn’t arbitrary. It’s the base NOAA uses nationwide to calculate heating degree days, a running tally of how far below comfortable each day’s average temperature falls. At OCEANA NAS, the reference station used here, October’s normal mean temperature sits at 61.9°F, just low enough to cross the threshold and mark the start of the season. January is colder still, averaging well below that mark, which is why it carries the most heating degree days of any month: 746.
None of this means Virginians should circle a date on the calendar. A monthly normal is an average built from thirty years of weather, not a forecast for any particular year. The first real cold snap almost always shows up before the October average would suggest, sometimes as an early frost in late September, sometimes as a cold front that rolls through and then retreats for two more weeks of Indian summer. The month is a pattern, not a promise.
The table below lays out how that pattern moves through the year, month by month, in heating degree days.
| Month | Heating degree days |
|---|---|
| January | 746 |
| February | 620 |
| March | 510 |
| April | 245 |
| May | 85 |
| June | 9 |
| September | 11 |
| October | 152 |
| November | 415 |
| December | 631 |
Notice the table skips July and August entirely. Neither month carries any heating degree days at this station, which simply means heating has nothing to do during those weeks. The shape of the rest of the year is worth sitting with for a second: a slow climb from September through January, then a slower fall back down through spring, rather than a sharp on-off switch.
How hard the winter works here
Heating degree days matter because they translate weather into something closer to a fuel bill. Roughly twice the annual degree days means roughly twice the fuel burned to keep the same house at the same temperature, all else being equal. At OCEANA NAS, the annual figure comes to about 3,424 heating degree days, alongside about 1,546 cooling degree days on the same base.
What that annual number can’t tell you on its own is whether a place has a long, mild season or a short, brutal one, and two very different climates can land on similar yearly totals. The monthly table above answers that question for Virginia: the season is long, running from October into April with real numbers, but no single month approaches the extremes seen in colder parts of the country. January’s 746 degree days is a meaningful load, not a spike that dwarfs everything around it. That’s a climate where steady, moderate heating over several months matters more than surviving one brutal cold snap.
This shape has practical consequences. A system sized to handle occasional deep cold but that runs inefficiently at moderate loads will spend most of its Virginia winter working outside its sweet spot, since so much of the season sits in that October-through-April middle range rather than at January’s peak.
What most homes in Virginia actually heat with
The Residential Energy Consumption Survey gives a clear picture of what’s actually installed in Virginia homes, both by equipment type and by fuel.
| System or fuel | Share of Virginia homes |
|---|---|
| Furnace | 56% |
| Central heat pump | 27% |
| Steam or hot-water boiler | 4% |
| Natural gas | 36% |
| Electricity | 50% |
| Fuel oil or kerosene | 4% |
| Propane | 5% |
A furnace is the most common piece of equipment in the state, but that share reflects what builders installed decades ago when a particular fuel was cheap, not a verdict on what’s best for a house today. Reading it as a recommendation would be a mistake.
Still, since furnaces dominate, it’s worth knowing what that means day to day. A forced-air furnace heats a house quickly and evenly once the air is moving, and it pairs naturally with central air conditioning through the same ductwork. Where it struggles is consistency in older homes with drafty rooms far from the unit, since forced air cools fast once it stops circulating. The one maintenance item that punishes skippers more than any other is the air filter. A clogged filter starves the system of airflow, forces the blower motor to work harder, and can shorten the life of the whole unit, all for the cost of a part that takes five minutes to swap.
Run it once before you need it
Systems tend to fail on the first genuinely cold night of the year, which is exactly when every heating technician in the region is already booked solid. The fix is to test the system weeks ahead of that, sometime in October, while there’s still room on a service schedule if something’s wrong.
- Turn the thermostat down a few degrees below room temperature, then back up, and listen for the system to kick on within a minute or two. A delay, a rattle, or a clicking sound that doesn’t resolve is worth noting.
- Expect a faint burnt-dust smell for the first several minutes. That’s normal: it’s dust that settled on the heat exchanger or in ductwork over the summer, burning off as things warm up. It should fade quickly and not return on later cycles.
- Check the filter and replace it if it’s dusty or discolored. This is the cheapest, fastest step on this list and the one most often skipped.
- Walk the house and clear space around vents, radiators, or the outdoor heat pump unit. Furniture, curtains, and leaf litter around an outdoor unit all choke airflow the system needs to work efficiently.
- Test the carbon monoxide alarm using its test button, and replace batteries if it’s been more than a year. Any fuel-burning furnace produces carbon monoxide as a byproduct, and a working alarm is the backstop that catches a venting problem before it becomes dangerous.
- If the system runs but a room stays cold, don’t assume the furnace is broken. The U.S. Department of Energy notes that in a typical house, “about 20%-30% of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts,” which means a perfectly healthy furnace can still leave a far room chilly. That’s a job for a technician who can pressure-test the ducts, not a reason to replace the unit.
- Call a professional if the system won’t start at all, trips a breaker, or produces a burning smell that doesn’t fade after ten minutes. Those are signs worth having checked before the coldest week of the year arrives.
What turning it down is actually worth
The Department of Energy puts a real number on thermostat setbacks: “You can save as much as 10% a year on heating and cooling by simply turning your thermostat back 7-10°F for 8 hours a day from its normal setting.” That figure covers heating and cooling together over a full year, not a single winter month, and it’s not a per-degree rule to be scaled up or down.
For a state where heating demand stretches across roughly seven months, from October through April, that 8-hour setback has a lot of hours to work with. Nights and empty-house workdays both qualify, and in a season this long, a consistent setback schedule adds up across far more days than it would in a place where real cold only lasts a few weeks.