United States · elevation 4154 ft AMSL
· 42.4818, -114.4880
Joslin Field Magic Valley Regional Airport (Twin Falls) is an airport with the ICAO code KTWF and the IATA code TWF. Country: United States. Nearest settlement listed in the database: Twin Falls. OurAirports classifies it as a medium-sized airport. Its ICAO code starts with the KT prefix, which marks airports in United States. The four-letter code KTWF is used in flight operations and weather reports, while the three-letter IATA code TWF is used for ticketing and baggage handling. The airport reference point sits at 42°28'54"N, 114°29'17"W, at an elevation of 4,154 ft (1,266 m) above sea level. The applicable time zone is America/Boise.
Aerial imagery showing the runway and apron layout - the zoom is matched to the longest runway.
| Threshold | Course | Length | Width | Surface |
|---|---|---|---|---|
| 08 | 80° | 2,653 m (8,704 ft) | 46 m (150 ft) | asphalt |
| 26 | 260° | |||
| 12 | 120° | 983 m (3,224 ft) | 23 m (75 ft) | asphalt |
| 30 | 300° |
The course is derived from the runway designator (number × 10), not from a survey - the actual magnetic bearing can differ by a few degrees.
Declared distances (TORA, TODA, ASDA, LDA) are published in the national AIP - they are not part of this table.
What the METAR reports from KTWF for 2023-2025 show - counted hour by hour.
We computed these statistics from 26,243 METAR reports issued by KTWF in 2023-2025. VFR conditions prevailed 93% of the time, MVFR 4% and IFR or LIFR 3%. Best month for VFR flying: June (100% of hours VFR). Most IFR and LIFR hours: January (10%).
Through the day, IFR or LIFR conditions are most frequent around 15:00 UTC (4% of reports at that hour) and least frequent around 02:00 UTC (2%).
Fog (FG) was reported on 19 days a year on average, most often in January. Thunderstorms (TS) occurred on 7.3 days a year on average, and snowfall on 39.
The wind most often blows from SSW (203°) - 16% of reports. Calm (0 kt) made up 4% of reports, and gusts of 25 kt or more appeared in 7%. Warmest month: July (average high 33.0 °C); coldest: January (average low -4.9 °C).
Day counts are for the selected period (for all years - the yearly average).
The top of each bar is the average daily high, the bottom the average daily low (usually around dawn), in °C.
Most often: SSW - 16% of reports. Each petal shows the direction the wind blows from (as in METAR) - the longer it is, the more often. Colour shows wind speed.
| Month | Avg high °C | Avg low °C | VFR | IFR/LIFR | Fog days | Thunderstorm days | Snow days |
|---|---|---|---|---|---|---|---|
| January | 2.9 | -4.9 | 80% | 10% | 4.7 | 0 | 7 |
| February | 6.0 | -3.1 | 89% | 4% | 4 | 0 | 8.3 |
| March | 9.7 | -0.8 | 88% | 6% | 3.3 | 0 | 11 |
| April | 16.5 | 2.1 | 97% | 2% | 1 | 0 | 2.7 |
| May | 21.9 | 7.4 | 96% | <1% | 0 | 2 | 0.3 |
| June | 27.1 | 12.0 | 100% | 0% | 0 | 1 | 0 |
| July | 33.0 | 17.1 | 96% | <1% | 0 | 0.7 | 0 |
| August | 31.0 | 15.2 | 98% | <1% | 0 | 2.7 | 0 |
| September | 26.6 | 10.8 | 99% | <1% | 0 | 1 | 0 |
| October | 18.5 | 4.6 | 92% | 2% | 0 | 0 | 0.7 |
| November | 10.3 | -0.8 | 93% | 3% | 2 | 0 | 2.7 |
| December | 7.0 | -1.8 | 86% | 7% | 3.7 | 0 | 6.3 |
Temperatures are averages of daily highs and lows. Day counts are the average per month over the period.
According to OurAirports data (compiled from AIP and FAA sources), Joslin Field Magic Valley Regional Airport (Twin Falls) has 2 runways: 08/26 - 2,653 m long (8,704 ft), 46 m wide, asphalt surface; 12/30 - 983 m long (3,224 ft), 23 m wide, asphalt surface.
The longest of them is 08/26, at 2,653 m.
The thresholds are oriented as follows: 08/26 on 80° and 260° magnetic, 12/30 on 120° and 300° magnetic. A threshold designator is its magnetic heading divided by ten (ICAO Annex 14), so the runway axis can be read straight off the numbers.
For the 08/26 axis, wind from the south (around 170°) or from the north (around 350°) blows perpendicular to the runway and produces the largest crosswind component. Wind from around 80° or 260° acts along the runway, as a headwind or a tailwind. The decoder on this page computes those components automatically from the current METAR.
Weather reports for Joslin Field Magic Valley Regional Airport (Twin Falls) are published under the ICAO code KTWF. A METAR is an observation of current conditions, usually issued every 30 or 60 minutes; a TAF is a forecast for the airport area, typically covering 9 to 30 hours.
The decoder breaks the KTWF report down into its parts: wind direction and speed including gusts and variability, visibility (including CAVOK and directional minimum visibility), weather phenomena by WMO code, cloud layers with their bases, temperature and dew point, QNH pressure, and the resulting flight category - VFR, MVFR, IFR or LIFR - using FAA thresholds.
Not every airport issues its own reports; many smaller airfields have no weather station. If no current data is available for KTWF, check the nearby airports listed below.
Reports always use UTC (the Z suffix). The America/Boise zone is GMT-07:00 in winter and GMT-06:00 in summer - that is the shift to apply to the time in the report to get local time at the airport.
The closest airports in the database, measured in a straight line from the reference point, are Jerome County Airport (KJER, 27 km), Gooding Municipal Airport (KGNG, 53 km), Burley Municipal Airport (KBYI, 59 km). When no report is available for KTWF, they usually give the best approximation of conditions in the area.
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The METAR archive for KTWF goes back to 31/12/1972. Pick a date and see every observation from that day.
Run a flying club, a training organisation or an airfield website? Embed a ready-made panel with the current KTWF METAR - flight category, wind, visibility, temperature and pressure, refreshed automatically. The configurator lets you pick language, theme and units; you paste the code once.
