Annapolis, Maryland climate: Normal weather by month, frost dates and records
Annapolis's normal year runs from 30°F January nights to 86°F July afternoons, with 44.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.3°C, January lows of −1°C, July highs of 30°C, 1,117 mm of precipitation a year.
- NOAA stationAnnapolis Naf
- Station IDUSW00013752
- Location38.98°N 76.47°W
- Elevation8 ft (2 m)
- Population40,689
On October 14, the normal high in Annapolis is 68°F and the normal low 53°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Annapolis.
- Jan 43° 30°
- Feb 45° 32°
- Mar 53° 38°
- Apr 64° 47°
- May 73° 57°
- Jun 82° 68°
- Jul 86° 72°
- Aug 84° 71°
- Sep 77° 65°
- Oct 67° 52°
- Nov 56° 42°
- Dec 47° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Annapolis each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 30°F. The most precipitation falls in September (5.14 in), the least in February (2.38 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 43°F | 30°F | 36.5°F | 2.84 | – | <1 | 20 | 9 h 40 min |
| February | 45°F | 32°F | 38.4°F | 2.38 | – | <1 | 15 | 10 h 40 min |
| March | 53°F | 38°F | 45.7°F | 3.80 | – | <1 | 6 | 11 h 50 min |
| April | 64°F | 47°F | 55.4°F | 3.38 | – | <1 | 1 | 13 h 10 min |
| May | 73°F | 57°F | 65.1°F | 3.15 | – | 1 | <1 | 14 h 20 min |
| June | 82°F | 68°F | 74.6°F | 4.04 | – | 4 | <1 | 14 h 50 min |
| July | 86°F | 72°F | 79.0°F | 4.94 | – | 9 | <1 | 14 h 40 min |
| August | 84°F | 71°F | 77.1°F | 4.27 | – | 5 | <1 | 13 h 40 min |
| September | 77°F | 65°F | 71.1°F | 5.14 | – | 2 | <1 | 12 h 30 min |
| October | 67°F | 52°F | 59.7°F | 4.04 | – | <1 | <1 | 11 h 20 min |
| November | 56°F | 42°F | 49.3°F | 3.03 | – | <1 | 2 | 10 h 10 min |
| December | 47°F | 34°F | 40.6°F | 2.98 | – | <1 | 12 | 9 h 30 min |
| Year (annual) | 65°F | 51°F | 57.7°F | 43.99 | – | 20 | 56 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 6°C | −1°C | 2.5°C | 72 mm |
| February | 7°C | 0°C | 3.6°C | 60 mm |
| March | 12°C | 3°C | 7.6°C | 97 mm |
| April | 18°C | 8°C | 13.0°C | 86 mm |
| May | 23°C | 14°C | 18.4°C | 80 mm |
| June | 28°C | 20°C | 23.7°C | 103 mm |
| July | 30°C | 22°C | 26.1°C | 125 mm |
| August | 29°C | 21°C | 25.1°C | 108 mm |
| September | 25°C | 18°C | 21.7°C | 131 mm |
| October | 19°C | 11°C | 15.4°C | 103 mm |
| November | 13°C | 6°C | 9.6°C | 77 mm |
| December | 8°C | 1°C | 4.8°C | 76 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Baltimore (17 miles away), gets 19 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013752; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Annapolis?
Normal highs sit between 65°F and 85°F in May, June, August, September and October.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013752.
When is the last frost in Annapolis?
In Annapolis, the last spring frost (32°F) comes after March 23 in half of years and after April 6 in one year in ten; the first autumn frost comes before November 20 in half of years and before November 4 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 231 year in 10 after April 6; 9 in 10 after March 8
- First autumn frost, half of years before
- November 201 year in 10 before November 4; 9 in 10 before December 5
NOAA puts the median frost-free season at 241 days, and the season without a hard freeze (28°F) at 266 days.
A hard freeze (28°F) comes after March 12 in half of springs and before December 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Annapolis in zones 7b to 8a across its 2 ZIP code areas (7b in 21401, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Annapolis's NOAA station is in zone 8a: the coldest night of a typical year reaches 13°F (19 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Maryland · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00013752; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Annapolis ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Annapolis's 2 ZIP code areas run from zone 7b to 8a: 1 in 7b and 1 in 8a. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Annapolis?
In a normal year in Annapolis, 20 days a year reach 90°F and 56 nights fall to 32°F or colder.
- Days at 90°F or more
- 20a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 56a normal year
- Days that stay below freezing
- 8high of 32°F or less
The highest temperature in Annapolis's official record (kept by the National Weather Service since 1894) is 106°F, on August 6, 1918; the lowest is −8°F, on January 22, 1984.
The wettest calendar year on that record is 2003, with 66.43 in; the snowiest season is 1957–58, with 49.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00013752; records: ACIS (NOAA Regional Climate Centers), NWS threaded record NAKthr. Records use complete months only; a month missing more than three days is left out.
How sunny is Annapolis?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Annapolis, 4.2 kWh per square metre a day. July is the sunniest month (84%) and January the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.2 |
| February | 72% | 3.0 |
| March | 72% | 4.0 |
| April | 75% | 5.2 |
| May | 76% | 5.8 |
| June | 82% | 6.4 |
| July | 84% | 6.3 |
| August | 82% | 5.6 |
| September | 79% | 4.5 |
| October | 76% | 3.4 |
| November | 76% | 2.5 |
| December | 71% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Annapolis need?
A normal year in Annapolis brings 4,062 heating degree days, 24% fewer than the median U.S. place (5,373), and 1,436 cooling degree days, 58% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,246 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 885 | 0 |
| February | 746 | 0 |
| March | 599 | 1 |
| April | 301 | 14 |
| May | 85 | 90 |
| June | 4 | 292 |
| July | 0 | 432 |
| August | 0 | 375 |
| September | 15 | 198 |
| October | 198 | 33 |
| November | 474 | 1 |
| December | 755 | 0 |
| Year (annual) | 4,062 | 1,436 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013752. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Annapolis been warmer than normal lately?
2025 averaged 57.2°F, 0.5°F below the 1991-2020 normal of 57.7°F. 2 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.9°F | +1.2°F | 37.52 |
| 2024 | 59.6°F | +1.9°F | 38.96 |
| 2025 | 57.2°F | −0.5°F | 42.42 |
Over 33 complete years from 1946 to 2025, the station's annual mean temperature rose at a fitted 2.8°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00013752; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Annapolis's climate compare?
Annapolis is warmer than 22 of the other 25 places with their own NOAA record in Maryland, and wetter than 6. Across the 7,247 U.S. stations with normals, its annual mean of 57.7°F is warmer than 68%.
In the Köppen classification computed from these normals, Annapolis is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Annapolis share this climate record?
6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Annapolis Neck, MD12,484 people · 4 mi SW
- Cape St. Claire, MD9,016 people · 4 mi N
- Mayo, MD8,322 people · 6 mi SW
- Shady Side, MD4,460 people · 11 mi S
- Naval Academy, MD1,592 people · 1 mi W
- Highland Beach, MD107 people · 4 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Annapolis's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Annapolis. This page uses Annapolis Naf; the other differs by site and elevation, and the linked ones have pages of their own:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Annapolis Police Barracks USC00180193 | 2 mi W | 25 ft | 58.8°F | 29°F | 89°F | – | – | March 27 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Annapolis's climate
What is the coldest month in Annapolis?
January, with a normal high of 43°F and a normal low of 30°F. The warmest is July (86°F by day, 72°F at night).
Does it snow in Annapolis?
Yes. NOAA publishes no 1991-2020 snowfall normal for Annapolis's NOAA station; the nearest record that keeps one, Baltimore (17 miles away), records 19 inches of snow in a normal year.
What is the rainiest month in Annapolis?
September, with 5.14 in of precipitation in a normal year; the driest is February with 2.38 in.
What plant hardiness zone is Annapolis in?
The USDA's 2023 map puts Annapolis in zones 7b to 8a across its 2 ZIP code areas (7b in 21401, the largest). By the same method at Annapolis's NOAA station, the coldest night of a typical year reaches 13°F (19 years, 1991-2020): zone 8a.
How late can frost come in Annapolis?
In half of years the last 32°F night comes after March 23; in one year in ten it comes after April 6. Waiting until April 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Annapolis in OctoberThis month day by day, its records and recent years
- Maryland climateThe statewide normals and every place in the state
- Annapolis Police Barracks, MD2 miles from this station, 58.8°F a year
- Stevensville, MD7 miles from this station, 57.1°F a year
- Baltimore, MD17 miles from this station, 56.2°F a year
- Glenn Dale, MD18 miles from this station, 54.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made