Wind on the strip—The strip’s direction is not mapped
Computed from the forecast air temperature, dew point and station pressure (NWS formulas; the correction factor by SAE J1349 and the older 60 °F STD standard). Track temperature is estimated from sun, wind and the surface; it is not a sensor reading. How these are figured.
This week
Day by day
TodayNov 860°15°39°4° 0%Green flag
TomorrowNov 954°12°35°1° 1%Green flag
TueNov 1060°16°42°5° 0%Green flag
WedNov 1151°10°44°7° 33%Red flag
ThuNov 1245°7°33°1° 11%Yellow flag
FriNov 1340°4°29°-2° 1%Yellow flag
SatNov 1444°7°27°-3° 0%Yellow flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Nov 8
Green flag
Clear
60°15°39°4°
0%
25 mph40 km/h W
76°25°
1,015 ft309 m
6:37 AM · 4:44 PM
Tomorrow Nov 9
Green flag
Overcast
54°12°35°1°
1%
20 mph32 km/h SW
71°22°
502 ft153 m
6:39 AM · 4:43 PM
Tue Nov 10
Green flag
Overcast
60°16°42°5°
0%
16 mph26 km/h WNW
82°28°
945 ft288 m
6:40 AM · 4:42 PM
Wed Nov 11
Red flagrain
Drizzle
51°10°44°7°
33% 0.19 in4.7 mm
27 mph44 km/h NE
55°13°
540 ft165 m
6:41 AM · 4:41 PM
Thu Nov 12
Yellow flaggusty wind
Overcast
45°7°33°1°
11% 0.01 in0.3 mm
35 mph56 km/h N
54°12°
-182 ft-55 m
6:42 AM · 4:40 PM
Fri Nov 13
Yellow flaggusty wind, cold
Overcast
40°4°29°-2°
1%
33 mph54 km/h NNW
51°11°
-460 ft-140 m
6:44 AM · 4:39 PM
Sat Nov 14
Yellow flagcold
Overcast
44°7°27°-3°
0%
19 mph30 km/h WNW
61°16°
-138 ft-42 m
6:45 AM · 4:38 PM
Flags judge the racing hours: 9 am to 10 pm at the track for a drag strip. National Weather Service alerts raise them. Days marked partial are at the edge of the forecast. How the flags work
Today’s remaining 11 hours are free. Pro members get all seven days and the CSV.
Hour
Air
Dew pt
Humidity
Barometer
Density alt.
Air density kg/m³
Grains
Track temp (est.)
Wind
Rain
59°15°
43°6°
55%
29.95 inHg1014 hPa
974 ft297 m
1.190
42
76°25°
11 mph18 km/h W · gusts 22 mph36 km/h
0%
60°15°
43°6°
54%
29.94 inHg1014 hPa
1,015 ft309 m
1.189
42
74°23°
11 mph18 km/h WNW · gusts 24 mph38 km/h
0%
58°14°
41°5°
54%
29.97 inHg1015 hPa
843 ft257 m
1.195
39
68°20°
11 mph18 km/h WNW · gusts 24 mph38 km/h
0%
54°12°
42°5°
62%
29.97 inHg1015 hPa
618 ft188 m
1.203
40
59°15°
9 mph14 km/h WNW · gusts 19 mph31 km/h
0%
50°10°
39°4°
67%
29.99 inHg1016 hPa
307 ft94 m
1.214
36
50°10°
7 mph12 km/h WNW · gusts 16 mph26 km/h
0%
47°9°
38°4°
71%
29.98 inHg1015 hPa
140 ft43 m
1.220
35
47°9°
7 mph11 km/h W · gusts 16 mph26 km/h
0%
46°8°
38°3°
74%
29.99 inHg1016 hPa
9 ft3 m
1.225
34
46°8°
7 mph11 km/h W · gusts 16 mph25 km/h
0%
44°7°
37°3°
77%
30.03 inHg1017 hPa
-128 ft-39 m
1.230
33
44°7°
6 mph10 km/h W · gusts 15 mph23 km/h
0%
43°6°
37°3°
80%
30.05 inHg1018 hPa
-239 ft-73 m
1.234
33
43°6°
6 mph10 km/h W · gusts 14 mph23 km/h
0%
42°5°
37°3°
84%
30.05 inHg1018 hPa
-302 ft-92 m
1.236
33
42°5°
6 mph10 km/h W · gusts 14 mph23 km/h
0%
41°5°
37°3°
87%
30.05 inHg1018 hPa
-363 ft-111 m
1.238
33
41°5°
5 mph8 km/h WNW · gusts 14 mph22 km/h
0%
Every hour from the forecast, the same arithmetic as the pit box above (NWS density-altitude formula; track temperature is an estimate). Hours are track time.
Raceway Weather Pro
Plan the whole week at Byron
Pit box, all week
Every forecast hour for the next seven days at Byron: density altitude, air density, grains, track temp and more, with a CSV for the tuning laptop.
Do the models agree?
ECMWF, GFS and ICON side by side for the next three racing days, so you know when the forecast is shaky.
Next 6 hours of rain
Rain in 15-minute steps for the next six hours at your tracks, refreshed every hour.
Alerts for your tracks
An email the morning a red or yellow flag is due at Byron, and a heads-up three days out.
Typical for November here: highs around 48°9°, lows 33°0°, rain on 22% of days.
Month by month
Average highs and lows, rain days, gusty days, freezing and hot days for all twelve months at Byron, from 5 years of records. Part of Raceway Weather Pro.
ClearTemperature 50°10°Rain chance 0%Wind 7 mph12 km/hWNWTrack temperature 50°10°Density altitude 307 ft94 m
OvercastTemperature 39°4°Rain chance 0%Wind 4 mph7 km/hWNWTrack temperature 39°4°Density altitude -520 ft-158 m
Partly cloudyTemperature 38°3°Rain chance 0%Wind 5 mph8 km/hWTrack temperature 38°3°Density altitude -628 ft-191 m
FogTemperature 35°1°Rain chance 0%Wind 2 mph3 km/hWTrack temperature 35°1°Density altitude -938 ft-286 m
OvercastTemperature 42°5°Rain chance 0%Wind 2 mph4 km/hSTrack temperature 54°12°Density altitude -436 ft-133 m
51°10° 44°7° 33%Red flag