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Trilla, IL Weather
Trilla, Illinois sits at 39.3751, -88.3507. Its warmest month is July, when the day usually reaches 86F, and its coldest is January, when the night usually falls to 21F. May is the wettest, with rain on about 12 days. The hottest day in the station record is 106F on July 7, 2012, and the coldest night -14F on January 6, 2014. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About Trilla weather
Trilla sits at 39.3751, -88.3507 and covers about 0.193 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in Trilla
Trilla is warmest in July, when the day usually reaches 86F, and coldest in January, when the night usually falls to 21F. May is the wettest month, with rain on about 12 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
January
36F
21F
7
February
40F
24F
7
March
52F
33F
9
April
64F
44F
10
May
74F
54F
12
June
83F
63F
10
July
86F
66F
10
August
84F
64F
9
September
80F
57F
8
October
66F
45F
8
November
53F
35F
8
December
40F
26F
8
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Mattoon Charleston Coles Co Ap station 8 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
Trilla weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Trilla: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Trilla weather records
In 29,431 days of observations Trilla has been as hot as 106F and as cold as -14F. Not averages: the actual days.
Hottest day
106F
July 7, 2012
Coldest night
-14F
January 6, 2014
Wettest day
5.56 in
July 21, 1896
Biggest snow
11.0 in
January 9, 1997
NOAA GHCN daily station records, observed 1998 to 2025: temperature at the Mattoon Charleston Coles Co Ap station, 8 miles away; precipitation at the Mattoon station, 6.8 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about Trilla weather
Common questions
What is the weather usually like in Trilla, IL?
Trilla is warmest in July, when the day usually reaches 86F, and coldest in January, when the night usually falls to 21F. Rain falls on roughly 106 days a year, most often in May. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Trilla, IL?
About 106 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. May is the wettest month with rain on about 12 of its days, and January the driest with about 7.
What is the hottest it has ever been in Trilla, IL?
The hottest day measured for Trilla reached 106F on July 7, 2012, and the coldest night -14F on January 6, 2014. Both are real NOAA station measurements from the GHCN daily archive, observed 1998 to 2025, at the Mattoon Charleston Coles Co Ap station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Trilla, IL?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the Trilla forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.