Baltimore weather in December

Regulars call this a genuine favourite month, festivals and football season overlapping with comfortable weather, but split the calendar in half - early September can run as warm as a Las Vegas afternoon, while late in the month a sweater becomes a real necessity in the evenings. Our row backs the average across that swing, 27.7C reading as a hot 29C at 76 percent humidity, over 19.4C nights, with 106.2mm of rain across 7.2 days. Regulars are consistent this month rewards checking the forecast close to a trip's dates rather than trusting either half's reputation blindly. The sea stays swimmable at 24.6C. The record: 8.6 hours of sun, a 17.2 kph wind and AQI 45.

Regulars describe this as the start of a genuinely hot, humid summer here, mornings still mild but afternoons pushing into real heat by mid-month. Our row backs the swing, 29.6C reading as a real 31C at 72.1 percent humidity, over 20C nights, with 80.1mm of rain across 7.6 days - regulars describe the rain as spread fairly evenly across the month rather than arriving as one prolonged soak, and often unpredictable day to day. The Inner Harbor's open waterfront plans are the ones most exposed to a passing shower, so regulars suggest keeping at least one indoor backup in mind for any single day. The sea sits at a swimmable 22.7C. The record: 11.4 hours of sun, a 17.7 kph wind and AQI 68.

Regulars rate late April into May as the good stretch here and treat early April as still spring rather than yet spring. Our row splits the difference at 19.9C days over 10C nights - but the felt figures are 18C and 6C, because a 22.4 kph wind runs off the water through the harbour. Dry air too, a dew point of 4.4C, so the shade is cold and the sun is not. The blossom is the early-April draw: the cherry trees at Fort McHenry are inside a paid site, but the seawall walk past them is free. Rain is 92.3mm across 7.6 days, which is a wet month delivered in few visits. The record: humidity 68 percent, 9.2 hours of sun, a 14.6C harbour and AQI 46.

October in Baltimore is the month regulars refuse to predict. Their list of what it can be runs from Indian summer through warm, rainy, cool, sunny and cold, and the figure they give for the swing is 90 one day and 45 the next - so the packing is layers with something waterproof. Mid-October in particular gets named for rain. What they will commit to is the evenings: the days can still be very warm, but the nights have turned pleasant, which our row puts at a 22C day over a 13C night. The month's fixture is the Fells Point festival on the first weekend, at the end of a September-and-October run of them. The record: 5.2 precipitation days carrying 62.6mm, humidity 74 percent and 7.8 hours of sun.