Jerome, ID

Idaho · Records since 1915–2026

☀️ 75°F Feels like 70°
Currently in Jerome
As of 12:30 PM MDT

Records for September 11

🔥 Record High

98°F

September 11, 1943

+18° from 80° normal

❄ Record Low

33°F

September 11, 1916

-17° from 50° normal
🌞 Normal high: 80°F 🌑 Normal low: 50°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 11

# Temp Date
🏆 98°F September 11, 1943
2 95°F September 11, 1953
3 94°F September 11, 1996
4 94°F September 11, 1990
5 93°F September 11, 1963
6 93°F September 11, 1955
7 92°F September 11, 1993
8 92°F September 11, 1976
9 92°F September 11, 1959
10 92°F September 11, 1958

Top 5 Record Lows — September 11

# Temp Date
🥶 33°F September 11, 1916
2 36°F September 11, 1948
3 36°F September 11, 1931
4 37°F September 11, 1988
5 37°F September 11, 1928
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

161 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

3.39"
2026 YTD
Normal: 6.60"
-3.21"
0.27"
September so far
September normal: 0.33"
-0.06"
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 — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
62.6°F
Average temperature
24th-coolest of 106
-3.1°
vs. average
Normal: 65.6°F (1991–2020)
0.27"
Precipitation
13th-wettest of 110
+0.19"
vs. average
Normal: 0.08" · 338% of normal

Average Temperature by Year — Sep 1 – Sep 10

1916–2026 · 2026 highlighted · trend +0.20° per decade (warming since 1916)

Precipitation by Year — Sep 1 – Sep 10

1916–2026 · 2026 highlighted

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2017 74.9°F
2 1998 73.6°F
3 1997 73.2°F
4 2022 73.2°F
5 1967 73.1°F
6 1990 72.5°F
7 1955 71.9°F
8 2025 71.8°F
9 1963 71.5°F
10 2024 71.3°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2000 56.7°F
2 1948 57.2°F
3 1921 57.8°F
4 1929 57.8°F
5 1999 59.0°F
6 2016 59.4°F
7 1964 59.5°F
8 2008 59.6°F
9 2010 59.6°F
10 1922 59.7°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1961 1.69"
2 1978 1.59"
3 1985 1.45"
4 1964 0.54"
5 1991 0.54"
6 1972 0.51"
7 2000 0.42"
8 1956 0.40"
9 1970 0.38"
10 2002 0.34"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2025 0.00"
2 2022 0.00"
3 2018 0.00"
4 2017 0.00"
5 2015 0.00"
6 2014 0.00"
7 2013 0.00"
8 2012 0.00"
9 2011 0.00"
10 2009 0.00"
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.
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