Ontario, OR

Oregon · Records since 1945–2026

☁️ 54°F Feels like 51°
Currently in Ontario
As of 4:45 PM MST

Records for November 12

🔥 Record High

67°F

November 12, 1999

+16° from 51° normal

❄ Record Low

14°F

November 12, 2014

-16° from 30° normal
🌞 Normal high: 51°F 🌑 Normal low: 30°F 1991–2020 normals

All-Time Records — Ontario

🔥
113°F
Hottest Day Ever
Jul 12, 1967
❄
-25°F
Coldest Day Ever
Jan 22, 1962
🌧
1.59"
Wettest Day Ever
Sep 14, 1959
☃
10.0"
Most Snow in One Day
Jan 8, 1993

First & Last Dates — Ontario

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)
191 days
Longest growing season
2015
74 days
Shortest growing season
1976
159 days
Normal growing season
1991–2020 average

Top 10 Record Highs — November 12

# Temp Date
🏆 67°F November 12, 1999
2 65°F November 12, 2016
3 63°F November 12, 1977
4 63°F November 12, 1969
5 62°F November 12, 2001
6 60°F November 12, 1973
7 60°F November 12, 1953
8 59°F November 12, 2025
9 59°F November 12, 1966
10 58°F November 12, 2008

Top 5 Record Lows — November 12

# Temp Date
🥶 14°F November 12, 2014
2 16°F November 12, 2018
3 16°F November 12, 1955
4 17°F November 12, 1958
5 18°F November 12, 1976
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 1945–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Ontario

threshold: 102°F (90th percentile of historical Jun–Aug highs)
5.2
Avg heat wave length
days (historical)
107°
Avg peak temp
during heat waves
7
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1945–2026
63
2026 so far
64
Avg/year 1970–2025
69
Avg/year (last 10 complete)
94
Most in a year (1967)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Ontario

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 22, 1971 – Aug 14, 1971 24 110°F (Aug 8) 106°F 62°F
2 Jun 15, 1961 – Jun 26, 1961 12 108°F (Jun 17) 105°F 60°F
3 Aug 10, 1967 – Aug 20, 1967 11 109°F (Aug 19) 106°F 55°F
4 Jul 13, 1960 – Jul 22, 1960 10 112°F (Jul 19) 107°F 62°F
5 Jul 17, 1956 – Jul 26, 1956 10 107°F (Jul 23) 104°F 59°F
6 Jun 28, 2021 – Jul 7, 2021 10 107°F (Jun 30) 105°F 68°F
7 Jul 15, 1959 – Jul 23, 1959 9 111°F (Jul 21) 107°F 59°F
8 Jul 3, 1968 – Jul 11, 1968 9 108°F (Jul 4) 105°F 61°F
9 Jul 16, 2024 – Jul 24, 2024 9 108°F (Jul 22) 105°F 68°F
10 Jul 25, 1973 – Aug 2, 1973 9 107°F (Aug 2) 105°F 60°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
29.1
Avg / summer
1970–2020
72
Most in a summer
2021

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 (1945–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1945, annual totals have trended +0.13" per decade, about +1.0" 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 Ontario is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

171 of 314 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

7.09"
2026 YTD
Normal: 7.48"
-0.39"
0.10"
November so far
November normal: 0.88"
-0.78"
1
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Ontario is 0.39" behind the normal pace

Period Review — Oct 11 – Nov 10, 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)
48.2°F
Average temperature
20th-warmest of 76
+1.6°
vs. average
Normal: 46.6°F (1991–2020)
0.52"
Precipitation
25th-driest of 74
-0.30"
vs. average
Normal: 0.82" · 63% of normal

Average Temperature by Year — Oct 11 – Nov 10

1945–2026 · 2026 highlighted · trend +0.18° per decade (warming since 1945)

Precipitation by Year — Oct 11 – Nov 10

1945–2026 · 2026 highlighted

Warmest Oct 11 – Nov 10 on Record

# Year Avg Temp
1 2015 51.0°F
2 2021 51.0°F
3 1950 50.8°F
4 2014 50.7°F
5 1963 50.5°F
6 1958 50.4°F
7 2023 50.3°F
8 2016 50.3°F
9 2010 50.0°F
10 1983 49.7°F

Coolest Oct 11 – Nov 10 on Record

# Year Avg Temp
1 1951 41.8°F
2 1946 42.1°F
3 2019 42.3°F
4 1995 42.4°F
5 1984 42.6°F
6 2002 42.7°F
7 1971 42.9°F
8 1970 43.3°F
9 1956 43.5°F
10 1949 44.0°F

Wettest Oct 11 – Nov 10 on Record

# Year Total
1 1956 3.21"
2 1970 2.19"
3 1968 2.12"
4 1982 2.04"
5 2017 1.80"
6 2000 1.66"
7 1962 1.62"
8 2021 1.59"
9 2005 1.56"
10 1994 1.55"

Driest Oct 11 – Nov 10 on Record

# Year Total
1 1952 0.00"
2 2018 0.02"
3 1978 0.03"
4 1976 0.03"
5 2003 0.06"
6 1986 0.10"
7 1959 0.17"
8 1954 0.17"
9 1965 0.18"
10 1977 0.19"
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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