Climate Comfort Score
87/100
Excellent
NOAA 1991–2020 normals 69°F annual avg Public-domain federal data
Glen ST Mary, FL Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 69°F
- Avg annual temp
- 87/100
- Comfort score
- 53.2"
- Annual precip
- 268d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Glen ST Mary
Glen ST Mary, Florida averages 69°F a year and scores 87/100 on the comfort index - excellent, milder than 89% of U.S. cities.
- 69°F
- average temperature, NOAA 1991-2020 normal
- 87/100
- comfort score, milder than 89% of U.S. cities
- 53.2"
- yearly precipitation total
- 268 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
69°F (20°C)
Avg High
81°F
Avg Low
56°F
Annual Precip
53.2"
Annual Snow
0.0"
Comfort Score
87/100
Excellent
Avg Annual Temperature
69°F
30-year mean (NOAA NCEI)
Annual Precipitation
53.2"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Glen ST Mary) 87.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Glen ST Mary area.
How Glen ST Mary compares to every U.S. city
Glen ST Mary's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
87 Top 11% higher than 89% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Glen ST Mary
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Glen ST Mary captures average conditions across the spread shown, the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 67°F (19°C) | 40°F (4°C) | 54°F (12°C) | 3.7" | 0.0" | 10.5 | 0.0 |
| February | 71°F (21°C) | 44°F (7°C) | 57°F (14°C) | 3.5" | 0.0" | 5.9 | 0.0 |
| March | 76°F (24°C) | 48°F (9°C) | 62°F (17°C) | 3.7" | 0.0" | 2.0 | 0.1 |
| April | 82°F (28°C) | 53°F (12°C) | 68°F (20°C) | 3.1" | 0.0" | 0.1 | 1.1 |
| May | 88°F (31°C) | 61°F (16°C) | 74°F (23°C) | 2.9" | 0.0" | 0.0 | 8.1 |
| June | 91°F (33°C) | 69°F (20°C) | 80°F (27°C) | 8.4" | 0.0" | 0.0 | 16.9 |
| July | 93°F (34°C) | 71°F (22°C) | 82°F (28°C) | 6.8" | 0.0" | 0.0 | 23.0 |
| August | 92°F (33°C) | 71°F (22°C) | 82°F (28°C) | 7.1" | 0.0" | 0.0 | 19.5 |
| September | 89°F (32°C) | 68°F (20°C) | 79°F (26°C) | 5.8" | 0.0" | 0.0 | 11.1 |
| October | 83°F (28°C) | 59°F (15°C) | 71°F (21°C) | 3.6" | 0.0" | 0.1 | 1.3 |
| November | 75°F (24°C) | 49°F (10°C) | 62°F (17°C) | 1.9" | 0.0" | 2.0 | 0.1 |
| December | 69°F (21°C) | 43°F (6°C) | 56°F (13°C) | 2.6" | 0.0" | 7.3 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 3.7"
8.2 days with precipitation
February 3.5"
7.6 days with precipitation
March 3.7"
7.7 days with precipitation
April 3.1"
5.9 days with precipitation
May 2.9"
6.3 days with precipitation
June 8.4"
13.5 days with precipitation
July 6.8"
13.9 days with precipitation
August 7.1"
14.5 days with precipitation
September 5.8"
10.2 days with precipitation
October 3.6"
6.8 days with precipitation
November 1.9"
5.5 days with precipitation
December 2.6"
6.2 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 1
50% probability date
Last Spring Freeze
March 8
50% probability date
Growing Season
268 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,297
Higher = more heating needed
Cooling Degree Days
2,687
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Glen ST Mary's climate means for you
Glen ST Mary runs 69°F a year - peaking in July, coldest in January.
- Gardeners get about 268 frost-free days, with the last spring freeze near March 8 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,297 heating and 2,687 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Glen ST Mary, FL
Glen ST Mary, Florida runs an annual average of 69°F, ranging from a mean daily high of 81°F to a mean daily low of 56°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00083470, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Glen ST Mary averages 53.2 inches of precipitation a year, with negligible snowfall, and that matters as much to daily life here as temperature does. The frost-free season averages 268 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 8 and the first fall freeze near December 1. As for energy demand, 1,297 heating degree days and 2,687 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Glen ST Mary scores 87/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Glen ST Mary, FL? ▼
The average annual temperature in Glen ST Mary, Florida is 69°F. The warmest month averages 93°F (34°C) and the coldest averages 40°F (4°C).
How much rain does Glen ST Mary get? ▼
Glen ST Mary receives 53.2 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Glen ST Mary? ▼
Glen ST Mary has a climate comfort score of 87/100 (Excellent), milder than 89% of U.S. cities in the PlainClimate database.
When is the growing season in Glen ST Mary? ▼
Glen ST Mary has approximately 268 frost-free days per year, with the last spring freeze around March 8 and the first fall freeze around December 1.
How much energy does heating and cooling require in Glen ST Mary? ▼
Glen ST Mary has 1,297 heating degree days and 2,687 cooling degree days annually, a cooling-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Glen ST Mary climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00083470 near Glen ST Mary.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00083470. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.