Glenwood, HI Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
- Warmer national band · Avg annual temp
- 67°FAnnual mean temperature: 67.0°F. National station-mapped location corpus median: 52.2°F across 6,861 measured records.
- Above score median · Comfort score
- 76/100PlainClimate Comfort Score: 76/100. National station-mapped Comfort Score corpus median: 64/100 across 6,189 measured records.
- Wetter national band · Annual precip
- 229.1"Annual precipitation: 229.1 inches. National station-mapped location corpus median: 36.2 inches across 6,352 measured records.
30-year climate normals (1991-2020) from Glenwood's primary NOAA station, GLENWOOD #2 55.4.
The climate verdict for Glenwood
Warm-season cooling demand defines Glenwood, Hawaii, running at more than twice its heating total. The NOAA normal records an annual average of 67°F. It scores 76/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 69% of them.
- 67°F
- average temperature, NOAA 1991-2020 normal
- 76/100
- comfort score, above 69% of station-mapped location scores
- 229.1"
- annual precipitation
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
67°F (19°C)Annual mean temperature: 67.0°F. National station-mapped location corpus median: 52.2°F across 6,861 measured records.
Warmer national band
Avg High
75°FAnnual average daily high: 75.1°F. National station-mapped location corpus median: 63.8°F across 6,861 measured records.
Warmer national band
Avg Low
59°FAnnual average daily low: 58.9°F. National station-mapped location corpus median: 41.1°F across 6,861 measured records.
Warmer national band
Annual Precip
229.1"Annual precipitation: 229.1 inches. National station-mapped location corpus median: 36.2 inches across 6,352 measured records.
Wetter national band
Annual Snow
0.0"Annual snowfall: 0.0 inches. National station-mapped location corpus median: 18.9 inches across 4,098 measured records.
Low-snow national band
Comfort Score
76/100PlainClimate Comfort Score: 76/100. National station-mapped Comfort Score corpus median: 64/100 across 6,189 measured records.
Above score median · Good
Glenwood sits in Hawaii, the #2 hottest U.S. state at 72.4°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · model supports three NOAA data products
Glenwood's broader climate profile: 77/100
A percentile-benchmarked model across annual, daily, and hourly climate normals. This record uses 2 measured NOAA products; every input remains inspectable.
PlainClimate-derived, not an official NOAA rating. This separate index does not replace the established Comfort Score used in rankings, and it is not a verdict on safety, health, housing, culture, or overall quality of life.
-
Annual temperature balance
67.0°F · 0.5° from 67.5°F
96/100 A · weight 25%Distance from a 67.5°F annual mean; smaller is better.
NOAA annual/seasonal normals ·
ANN-TAVG-NORMAL -
Precipitation balance
229.1 in · 194.1 from 35 in
0/100 F · weight 15%Distance from 35 annual inches; smaller is better.
NOAA annual/seasonal normals ·
ANN-PRCP-NORMAL -
Snowfall burden
0.0 inches/year
90/100 A · weight 10%Annual snowfall; lower is better in this formula.
NOAA annual/seasonal normals ·
ANN-SNOW-NORMAL -
Frost-free season
Not measured
N/A N/A · weight 10%Not scored; its 10% weight redistributes across measured dimensions.
Days between NOAA 50% spring and fall freeze dates; longer is better.
NOAA annual/seasonal normals ·
ANN-TMIN-PRBLST-T32FP50 + ANN-TMIN-PRBFST-T32FP50 -
Normal heat + freeze calendar
0 calendar days
100/100 A · weight 25%Normal high ≥90°F days plus normal low ≤32°F days; lower is better.
NOAA daily multivariate normals ·
DLY-TMAX-NORMAL + DLY-TMIN-NORMAL (derived counts) -
Summer moisture balance
Not measured
N/A N/A · weight 15%Not scored; its 15% weight redistributes across measured dimensions.
June–August mean dew point distance from 52.5°F; smaller is better.
NOAA hourly normals ·
HLY-DEWP-NORMAL
Live national benchmark table and calculation
Each raw metric is linearly interpolated across its live p10, p25, p50, p75, and p90 breakpoints. Equal-valued breakpoints collapse to their mean percentile; values outside p10-p90 extrapolate toward 0 or 100 using the nearest non-flat segment, then clamp to that range. Scores favor the direction shown, then combine by the listed weights. Missing dimensions are removed from both the weighted sum and available weight before normalization.
| Dimension | Weight | Better | p10 | p25 | p50 | p75 | p90 | n |
|---|---|---|---|---|---|---|---|---|
| Annual temperature balance | 25% | Lower | 3.4 | 7.9 | 15.3 | 21 | 25.2 | 6,861 |
| Precipitation balance | 15% | Lower | 2.7 | 7.1 | 14.2 | 20.9 | 25.7 | 6,352 |
| Snowfall burden | 10% | Lower | 0 | 2.1 | 18.9 | 42.7 | 69.8 | 4,098 |
| Frost-free season | 10% | Higher | 127 | 150 | 180 | 215 | 253 | 6,446 |
| Normal heat + freeze calendar | 25% | Lower | 56 | 102 | 145 | 180 | 207 | 6,859 |
| Summer moisture balance | 15% | Lower | 2.7 | 6.1 | 9.3 | 14.8 | 18.4 | 417 |
Grades: A 85–100 · B 70–84 · C 55–69 · D 40–54 · F below 40.
Established ranking Comfort Score: 76/100 · inspect its separate fixed-point formula
This legacy score keeps the rankings stable. It uses annual/seasonal normals only; unlike the Climate Living Index above, it is not percentile-scored per dimension.
- Temperature mildness67.0°F annual mean40/40 points
- Precipitation moderation229.1 inches/year10/30 points
- Snow burden0.0 inches/year15/15 points
- Frost-free seasonNot measuredN/A · weight removed
65/85 available points → 76/100. Full Comfort Score method.
Source: NOAA NCEI U.S. Climate Normals v1.0.1 (1991–2020). This record uses NOAA annual/seasonal normals and NOAA daily multivariate normals; the model also supports hourly normals where published · data updated 2026-08-04. Full methodology and limits.
How Glenwood compares with its closest stations
Against the 6 closest stations in the record, Glenwood averages 67°F a year, warmer than Hawaii Vol National Park Headquarters, HI (62°F) and Mauna Loa, HI (46°F), and cooler than Hilo, HI (74°F) and Kihalani, HI (71°F). On comfort score it places 2 of 6 in that local group.
Corpus-relative placement
Where Glenwood sits across the climate record
These comparisons place this primary-station normal among station-mapped locations with the same NOAA 1991–2020 fields.
- Annual temperature
- Warmer than 92%
- of 6,861 measured location normals.
- Annual precipitation
- Wetter than 99%
- of 6,352 measured location normals.
- Seasonal temperature swing
- Larger than 0%
- of 6,861 complete location-year normals.
How Glenwood compares across U.S. station-mapped locations
Glenwood's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
76 Top 31% score exceeds 69% 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%). This entry sits in this band.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 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 | 74°F (23°C) | 56°F (13°C) | 65°F (18°C) | 13.1" | 0.0" | 0.0 | 0.6 |
| February | 72°F (22°C) | 56°F (13°C) | 64°F (18°C) | 15.8" | 0.0" | 0.0 | 0.0 |
| March | 73°F (23°C) | 57°F (14°C) | 65°F (18°C) | 22.9" | 0.0" | 0.0 | 0.0 |
| April | 73°F (23°C) | 58°F (14°C) | 66°F (19°C) | 22.0" | 0.0" | 0.0 | 0.0 |
| May | 75°F (24°C) | 59°F (15°C) | 67°F (19°C) | 15.0" | 0.0" | 0.0 | 0.0 |
| June | 76°F (24°C) | 60°F (16°C) | 68°F (20°C) | 18.1" | 0.0" | 0.0 | 0.0 |
| July | 77°F (25°C) | 62°F (16°C) | 69°F (21°C) | 19.0" | 0.0" | 0.0 | 0.0 |
| August | 77°F (25°C) | 62°F (17°C) | 70°F (21°C) | 23.5" | 0.0" | 0.0 | 0.0 |
| September | 78°F (26°C) | 61°F (16°C) | 70°F (21°C) | 16.1" | 0.0" | 0.0 | 0.0 |
| October | 77°F (25°C) | 61°F (16°C) | 69°F (20°C) | 18.2" | 0.0" | 0.0 | 0.0 |
| November | 75°F (24°C) | 59°F (15°C) | 67°F (19°C) | 23.1" | 0.0" | 0.0 | 0.0 |
| December | 74°F (23°C) | 57°F (14°C) | 66°F (19°C) | 22.3" | 0.0" | 0.0 | 0.0 |
The year, day by day
The calendar barely moves in Glenwood: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 56°F near January 28 and 78°F near September 16.
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 56°F around January 28.
Where the wet dates fall
The likeliest wet date is August 7, when 93% of years recorded at least a hundredth of an inch. The driest is January 16 at 58%. Summed across the calendar, that is about 302 wet dates a year.
The widest day
January 13 carries the biggest normal gap between afternoon and dawn, 18°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Glenwood.
Where Glenwood Stands Nationally
This is one of the wettest normals climates ranked: about 229 inches of precipitation in a normal year, a total fewer than one station in ten surpasses.
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 18°F.
Standing computed against the distribution of 6,860 NOAA 1991–2020 normals stations in the PlainClimate database; only nationally notable standings are shown.
Monthly Precipitation
Average monthly rainfall and snowfall
17.4 days with precipitation
20.3 days with precipitation
25.9 days with precipitation
28.0 days with precipitation
25.4 days with precipitation
27.2 days with precipitation
27.8 days with precipitation
28.6 days with precipitation
25.9 days with precipitation
26.9 days with precipitation
25.1 days with precipitation
22.6 days with precipitation
Glenwood spreads its precipitation across the year
Neither half of the year dominates here: June through August take 26% of the annual total and December through February 22%, with neither reaching the 35% that would mark a distinct wet season. Glenwood has no dry season to plan around, though it does carry an unusually narrow 5.8°F seasonal spread.
The gap between the wettest and driest month still matters: August averages 23.5" and January 13.1". The three wettest months together take 30% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Glenwood, it arrives in quantity
229.1" of precipitation falls across only about 301 wet days here, averaging 0.76 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 301 a year, 82% of all days
- Average depth per wet day
- 0.76 inches
- Most wet days
- August, about 29
- Fewest wet days
- January, about 17
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.
Glenwood'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
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
168
Higher = more heating needed
Cooling Degree Days
904
Higher = more cooling needed
Warmest Month
September
Coldest Month
February
Places with a similar climate profile
NOAA 1991–2020 annual normals connect this location to non-geographic peers. Temperature peers use annual mean temperature; energy peers use both heating and cooling degree days.
Closest annual-temperature peers
What Glenwood's climate means for you
Glenwood runs 67°F a year - peaking in September, coldest in February.
- Air conditioning drives the bills rather than the furnace: 904 cooling degree days against 168 for heating.
- See how Glenwood lines up against the rest of Hawaii and the national rankings. See rankings
Climate Guides
Data-derived climate profile
How Glenwood's climate pattern fits together
cooling led · wet · low swing
Warm-season load persists through a relatively even calendar in Glenwood. Cooling totals 904 degree days, more than double the 168 heating measure, and the 5.8°F seasonal range is compact rather than sharply divided.
Warm-season demand is paired with a wet annual normal: 229.1 inches of precipitation at Glenwood. Recorded annual snowfall is negligible. The month-by-month bars distinguish a concentrated wet season from moisture spread across the calendar.
Glenwood's 5.8°F seasonal spread is compact even though precipitation is abundant. September and February mark the typical warm and cold ends of the calendar. The annual average is 67°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
A frost-free growing-season length is not available for Glenwood. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
These labels group NOAA 1991-2020 normals from Glenwood's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. They are descriptive ranges, not an official NOAA classification or a forecast for any specific year.
The year in four calendar signals
- Warmest normal
- September
- Even at its warmest the station only averages 70°F (21°C), so no month here is hot by national standards.
- Coldest normal
- February
- The coldest month still averages 64°F (18°C), above freezing, so this calendar has no hard winter.
- Rainfall rhythm
- August to January
- August is typically wettest; January is driest.
- Mild-temperature window
- January through December
- Monthly means sit between 55°F and 75°F in this window.
Frequently Asked Questions
What is the average temperature in Glenwood, HI? ▼
How much rain does Glenwood get? ▼
What is the comfort score for Glenwood? ▼
How much energy does heating and cooling require in Glenwood? ▼
Where does this Glenwood climate data come from? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Glenwood's primary station: GLENWOOD #2 55.4 (USC00510746). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. The reproducible method is an exact normalized name-and-state match; unresolved is an upper bound on facilities because spelling variants can be missed.
Related
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.