Hannibal gets about 140 inches of snow a winter, more than all but 76 U.S. towns
Midsummer highs settle at about 80°. Its July afternoons stay fresher than in 90% of U.S. towns. The latest 30-year average runs 1.4° warmer than 1901–2000’s, with December up the most. Seedlings are safe outdoors from about April 22, with the first autumn frost due around October 29.
A year in Hannibal at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hannibal’s climate
Compared with towns across the U.S., with Hannibal’s place in New York beside it.
What a year in Hannibal feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 187 frost-free days a year
In half of years the last 32° night comes by April 22 and the first by October 29. Frost and day counts come from NOAA’s station at Oswego, NY, 9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hannibal’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −7°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 140 inches of snow a winter
Snow, measured at Oswego, NY, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 172 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hannibal
92% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Oswego, NY.
Living with Hannibal’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
187 frost-free days in zone 6a. The last frost comes by Apr 22 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 29.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Hannibal from natural hazards, river flooding is the largest share (82%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hannibal and similar climates
TownRatings has no climate map of the towns around Hannibal yet.
Climates most like Hannibal’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Hannibal, NY | 16° | 80° | 42" | 140" |
| Chardon, OH | 18° | 81° | 45" | 114" |
| Corry, PA | 16° | 80° | 47" | 114" |
| Jericho, VT | 9° | 79° | 43" | 139" |
| Allegan, MI | 18° | 83° | 39" | 109" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Hannibal averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.9°).
A bigger shift than in 54% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Hannibal compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hannibal’s place among New York’s.
Hannibal weather by month
Highs, lows and precipitation from NOAA’s grid at Hannibal’s center; snow, wet days and snow on the ground from Oswego, NY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 16° | 3.3" | 44.7" | 20 | 24 | 12° – 32° |
| February | 33° | 17° | 2.6" | 35.3" | 16 | 24 | 11° – 33° |
| March | 41° | 24° | 2.9" | 17.1" | 15 | 17 | 25° – 45° |
| April | 54° | 35° | 3.5" | 2.8" | 14 | 1 | 38° – 51° |
| May | 67° | 46° | 3.4" | 0.0" | 13 | 0 | 50° – 62° |
| June | 76° | 56° | 3.7" | 0.0" | 12 | 0 | 63° – 71° |
| July | 80° | 61° | 3.7" | 0.0" | 11 | 0 | 65° – 75° |
| August | 79° | 59° | 3.5" | 0.0" | 11 | 0 | 66° – 73° |
| September | 72° | 52° | 3.7" | 0.0" | 11 | 0 | 58° – 67° |
| October | 59° | 42° | 4.4" | 0.2" | 15 | 0 | 46° – 57° |
| November | 47° | 32° | 3.8" | 9.4" | 16 | 5 | 34° – 46° |
| December | 36° | 24° | 3.7" | 30.6" | 19 | 17 | 22° – 41° |
| Year | 56° | 39° | 42.1" | 140.1" | 172 | 89 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 11° to 33°. August is the most reliable, staying within 8°.
Where Hannibal’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Hannibal’s center.
- Snow: Oswego, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Oswego, NY, 9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Hannibal’s climate
What is the weather like in Hannibal?
A typical July afternoon reaches 80°, a January night drops to 16°, and about 140 inches of snow falls in a normal winter. Colder January nights than 81% of U.S. towns; cooler July afternoons than 90% of U.S. towns.
How cold does it get in Hannibal in winter?
January nights average 16°. About 119 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 12°.
How much snow does Hannibal get?
About 140 inches in a normal winter at Oswego, NY, most of it in January, with snow on the ground about 89 days a year.
How hot does it get in Hannibal?
July, with a typical high of 80° and a low of 61°. About 3 days a year reach 90° (Oswego, NY).
When is the first and last frost in Hannibal?
In half of years the last spring frost (32°) comes by April 22 and the first fall frost by October 29, about 187 frost-free days, at Oswego, NY.
What growing zone is Hannibal in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −7°.
What is the best time of year to visit Hannibal?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hannibal getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hannibal.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.