Glen St Mary, FL Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Glen St Mary's primary NOAA station, GLEN ST MARY 1 W.
The climate verdict for Glen St Mary
Warm-season cooling demand defines Glen St Mary, Florida, running at more than twice its heating total. The NOAA normal records an annual average of 69°F. It scores 87/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 87% of them.
- 69°F
- average temperature, NOAA 1991-2020 normal
- 87/100
- comfort score, above 87% of station-mapped location scores
- 53.2"
- yearly precipitation total
- 268 days
- frost-free growing season
Glen St Mary: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00083470 · Glen St Mary, FL 69°F mean · 53.2" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-WET · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-MILD 69°F
- RANK-WARM #6,449
- PHOTO-FINISH ≈ Bay City Wtr Wks
- PRCP-WET 53.2"
- SWING-NARROW 29°F
- COMF-TOP 87/100
- LOAD-COOL 2,687 CDD
- STN-1 USC00083470
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Bay City Wtr Wks, TX (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every FL station list.
- Glen St Mary (this station) 69°F
- Cold Jackson Whiteho…, FL 69°F
- Hot Perry Foley, FL 69°F
- Near Bay City Wtr Wks, TX 69°F
- Near Cross City, FL 69°F
Glen St Mary sits in Florida, the #1 hottest U.S. state at 72.6°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · Glen St Mary
Glen St Mary: 78/100 · grade B
Glen St Mary publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Glen St Mary, not an official NOAA rating. Rankings still use Comfort Score 87/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 68.7°F · 1.2° from 67.5°F | 95/100 · A |
| Frost-free season | 268 days/year | 94/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Normal heat + freeze calendar | 97 calendar days | 77/100 · B |
| Precipitation balance | 53.2 in · 18.2 from 35 in | 35/100 · F |
Glen St Mary · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Glen St Mary is a temperate Köppen climate: Cfa
Coldest-month mean 53.5°F and warmest-month mean 82.0°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 82.0°F
- Coldest month
- 53.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · cooling-led station
Where Glen St Mary sits across the climate record
Three NOAA fields for Glen St Mary's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 6% warmest
- Among 6,861 stations, Glen St Mary sits in the warmer third of annual means.
- Annual precipitation
- Top 13% wettest
- Glen St Mary's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 92%
- Warmest-to-coldest month gap for Glen St Mary is compact versus 6,861 complete station-years.
How Glen St Mary compares across U.S. station-mapped locations
Glen St Mary's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
87 Top 13% score exceeds 87% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
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 |
The year, day by day
The year in Glen St Mary runs from a mild 39°F around January 8 to 93°F at the peak near July 17, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from June 3 through September 7, covering 97 dates. The broader mild season, normal highs of 70°F or more, runs February 12 to December 11.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 39°F around January 8.
Where the wet dates fall
The likeliest wet date is June 30, when 46% of years recorded at least a hundredth of an inch. The driest is November 5 at 17%. Summed across the calendar, that is about 106 wet dates a year.
The widest day
April 26 carries the biggest normal gap between afternoon and dawn, 29°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Glen St Mary.
Where Glen St Mary Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 97 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
The normal water year runs well above the national norm at roughly 53 inches.
Glen St Mary earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
8.2 days with precipitation
7.6 days with precipitation
7.7 days with precipitation
5.9 days with precipitation
6.3 days with precipitation
13.5 days with precipitation
13.9 days with precipitation
14.5 days with precipitation
10.2 days with precipitation
6.8 days with precipitation
5.5 days with precipitation
6.2 days with precipitation
Glen St Mary runs a summer-peaked wet season
42% of Glen St Mary's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is June at 8.4", on an unusually narrow 28.5°F seasonal spread. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: June, August, July, taking 42% of the annual total between them.
- Driest month: November at 1.9".
- Winter share: 18% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
When it rains in Glen St Mary, it arrives in quantity
53.2" of precipitation falls across only about 106 wet days here, averaging 0.50 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 106 a year, 29% of all days
- Average depth per wet day
- 0.50 inches
- Most wet days
- August, about 15
- Fewest wet days
- November, about 6
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Glen St Mary's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
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
Nationwide similar cities
Other rankable U.S. places outside FL closest to Glen St Mary on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (69°F here).
- Anahuac, TX 69°F · 0.0°F off
- Baytown, TX 69°F · 0.0°F off
- Bellville, TX 69°F · 0.1°F off
- Columbus, TX 69°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (53.2" here), excluding temperature-peer places.
- Stanton, KY 53.2" · 0.0" off
- Waldron, AR 53.2" · 0.0" off
- Mullins, SC 53.2" · 0.0" off
- Grass Valley, CA 53.2" · 0.0" off
Data-derived climate profile
How Glen St Mary's climate pattern fits together
cooling led · wet · low swing
Warm-season load persists through a relatively even calendar in Glen St Mary. Cooling totals 2,687 degree days, more than double the 1,297 heating measure, and the 28.5°F seasonal range is compact rather than sharply divided.
Warm-season demand is paired with a wet annual normal: 53.2 inches of precipitation at Glen St Mary. Recorded annual snowfall is negligible. The month-by-month bars distinguish a concentrated wet season from moisture spread across the calendar.
Glen St Mary's 28.5°F seasonal spread is compact even though precipitation is abundant. July and January mark the typical warm and cold ends of the calendar. The annual average is 69°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
The frost-free window extends for about 268 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
These labels group NOAA 1991-2020 normals from Glen St Mary's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. For Glen St Mary that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Glen St Mary's climate
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Glen St Mary's primary station: GLEN ST MARY 1 W (USC00083470). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 1226075). Match rule for Glen St Mary: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Glen St Mary comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.