Jerome, ID

Idaho · Records since 1915–2026

🌙 61°F Feels like 51°
Currently in Jerome
As of 8:15 PM MDT

Records for September 26

🔥 Record High

91°F

September 26, 1952

+18° from 73° normal

❄ Record Low

23°F

September 26, 1926

-23° from 46° normal
🌞 Normal high: 73°F 🌑 Normal low: 46°F 1991–2020 normals

All-Time Records — Jerome

🔥
110°F
Hottest Day Ever
Jun 19, 1940
❄
-25°F
Coldest Day Ever
Jan 21, 1937
🌧
2.08"
Wettest Day Ever
Apr 8, 2009
☃
8.0"
Most Snow in One Day
Feb 2, 1916

First & Last Dates — Jerome

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
198 days
Longest growing season
1987
80 days
Shortest growing season
1916
149 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 91°F September 26, 1952
2 89°F September 26, 1994
3 89°F September 26, 1991
4 89°F September 26, 1989
5 89°F September 26, 1957
6 88°F September 26, 1978
7 88°F September 26, 1969
8 88°F September 26, 1963
9 88°F September 26, 1960
10 87°F September 26, 1962

Top 5 Record Lows — September 26

# Temp Date
🥶 23°F September 26, 1926
2 26°F September 26, 1984
3 26°F September 26, 1934
4 30°F September 26, 1936
5 31°F September 26, 1970
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1915–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Jerome

threshold: 97°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
101°
Avg peak temp
during heat waves
4
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1916–2026
40
2026 so far
46
Avg/year 1970–2025
46
Avg/year (last 10 complete)
76
Most in a year (1940)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Jerome

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 17, 1931 – Jul 28, 1931 12 106°F (Jul 20) 101°F 65°F
2 Aug 10, 1967 – Aug 21, 1967 12 100°F (Aug 12) 99°F 59°F
3 Jul 2, 1985 – Jul 12, 1985 11 103°F (Jul 7) 100°F 62°F
4 Jul 27, 1969 – Aug 5, 1969 10 103°F (Jul 27) 98°F 58°F
5 Jul 14, 1936 – Jul 22, 1936 9 105°F (Jul 18) 100°F 65°F
6 Jul 14, 1960 – Jul 22, 1960 9 103°F (Jul 19) 99°F 59°F
7 Jun 17, 1961 – Jun 25, 1961 9 100°F (Jun 20) 99°F 57°F
8 Jul 21, 1988 – Jul 28, 1988 8 105°F (Jul 22) 99°F 61°F
9 Jun 27, 2015 – Jul 4, 2015 8 103°F (Jun 28) 99°F 66°F
10 Jul 16, 1959 – Jul 23, 1959 8 102°F (Jul 17) 100°F 58°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

63
2026 total
above-normal nights
31.8
Avg / summer
1970–2020
65
Most in a summer
2022

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1915–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1915, annual totals have trended +0.16" per decade, about +1.8" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Jerome is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

167 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

3.55"
2026 YTD
Normal: 6.76"
-3.21"
0.43"
September so far
September normal: 0.33"
+0.10"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Jerome is 3.21" behind the normal pace

Period Review — Aug 26 – Sep 25, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
64.5°F
Average temperature
43rd-warmest of 109
+0.6°
vs. average
Normal: 63.9°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1916–2026 · 2026 highlighted · trend +0.13° per decade (warming since 1916)

Precipitation by Year — Aug 26 – Sep 25

1916–2025 · 2026 highlighted · trend +0.01" per decade (wetter since 1916)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1938 69.9°F
2 1967 69.1°F
3 1990 68.8°F
4 2022 68.7°F
5 1935 67.9°F
6 2009 67.7°F
7 1997 67.5°F
8 2025 67.5°F
9 1998 67.5°F
10 2020 67.3°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1965 56.7°F
2 1921 58.4°F
3 1964 59.0°F
4 1926 59.1°F
5 1978 59.2°F
6 2004 59.3°F
7 1985 59.4°F
8 1941 59.5°F
9 1948 59.9°F
10 1993 60.0°F
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
← Back to all stations