Marianna has chilly, snowy winters and pleasant summers
A typical July afternoon reaches 84°, a January night drops to 21°, and about 30 inches of snow falls in a normal winter.
A year in Marianna at a glance
Each month’s typical high and low, and what it brings.
What stands out about Marianna’s climate
Read from where Marianna sits among Pennsylvania’s towns. The page puts what stands out first.
Warmer than it used to be
The last 30 years in Marianna averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 71% of U.S. towns.
Change by month
30 inches of snow, 42 of rain and melt
May is the wettest month and February the driest. Rain or snow falls on about 152 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
What a year in Marianna feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 164 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 15.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Marianna’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
164 frost-free days. The last frost comes by May 3 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 15.
About 30" a winter over 9 days with an inch or more, most in January. Snow covers the ground about 30 days a year.
Months averaging under 55° run from October through April. Heating is 90% of the year’s heating-and-cooling load.
About 10 days a year reach 90°, and July afternoons average 84°.
The nicest months are May, June, July, August, September and October.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →How Marianna compares
Against every U.S. town on TownTapestry, each counted once, with its place in Pennsylvania.
Marianna weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 21° | 3.2" | 9.5" | 15 | 12 | 22° – 39° |
| February | 42° | 23° | 2.8" | 8.1" | 13 | 8 | 20° – 41° |
| March | 51° | 30° | 3.5" | 5.6" | 13 | 4 | 34° – 51° |
| April | 64° | 39° | 3.6" | 0.4" | 14 | 0 | 46° – 56° |
| May | 73° | 48° | 4.3" | 0 | 14 | 0 | 54° – 67° |
| June | 81° | 57° | 4.2" | 0 | 13 | 0 | 65° – 71° |
| July | 84° | 61° | 4.3" | 0 | 11 | 0 | 68° – 76° |
| August | 83° | 60° | 3.6" | 0 | 11 | 0 | 67° – 76° |
| September | 77° | 54° | 3.4" | 0 | 10 | 0 | 62° – 70° |
| October | 65° | 42° | 3.0" | 0.2" | 11 | 0 | 50° – 60° |
| November | 53° | 33° | 2.8" | 0.7" | 12 | 1 | 36° – 48° |
| December | 43° | 26° | 3.2" | 5.6" | 14 | 6 | 24° – 45° |
| Year | 63° | 41° | 41.9" | 30.1" | 152 | 30 |
Heating and cooling a home in Marianna
90% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 24° to 45°. June is the most reliable, staying within 7°.
Common questions about Marianna’s climate
What is the coldest month in Marianna?
January, with a typical high of 38° and a low of 21°.
What is the hottest month in Marianna?
July, with a typical high of 84° and a low of 61°. About 10 days a year reach 90°.
How much snow does Marianna get?
About 30 inches in a normal winter, most of it in January.
When is the first frost in Marianna?
In half of years the first 32° night comes by October 15, and the last spring frost by May 3.
What is the rainiest month in Marianna?
May, with 4.3 inches of rain and melted snow. The year totals 42 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Marianna.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Marianna itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Waynesburg 1 E, PA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.