when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are giving birth these days (average date of birth is June 10th) so flights will be diminished, unless a north front moves through that stirs up insect activity.
Sunset: 8:32 pm
Dark: 9:02 pm (10-20 min. earlier if cloudy)
Sunrise: 6:29 am
Tuesday June 10, 2025
Flight: 8:52 pm
Notes: ~20 minutes after sunset, only ~12% of the colony flew 12 miles SSW (only ~1% of the those flew to altitude) on NE Winds at 13 mph – with gusts to 21 mph – had been easterly 3-17 mph all afternoon with gusts to 24 mph around 6:30pm, Visibility 10 miles, Partly Cloudy, Temp 81°F, Dew Point 73°F steady, 18 Cooling Degree Days, Cloud Base 1824′, RH 77% rising, Heat Index 86°F, BP 29.90 falling, sea level 1011.4 mb falling, bats viewable until 10:07 pm under streetlights
Tuesday June 10, 2025
8:40 pm – 9:10 pm
when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are giving birth these days (average date of birth is June 10th) so flights will be diminished, unless a north front moves through that stirs up insect activity.
Sunset: 8:32 pm
Dark: 9:02 pm (10-20 min. earlier if cloudy)
Sunrise: 6:29 am
Monday June 9, 2025
Flight: 8:52 pm
Notes:14 mins after sunset, a whopping 63% of the colony emerged to chase to frontal passage – some went 46 miles WNE while most went 12 miles SSW on NE Winds at 10 mph – had been S 10-18 mph earlier with gusts to 35 mph turning NE 13-20 mph around 4:30pm, Visibility 10 miles, A Few Clouds, N/A Heating Degree Days, Cloud Base 3192′, Temp 86°F, Dew Point 72°F falling, RH 63% rising, Heat Index 92°F, BP 29.87 rising, sea level 1010.3mb rising, bats viewable until 10:07 pm under streetlights
Monday June 9, 2025
8:40 pm – 9:10 pm
when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are giving birth these days (average date of birth around June 10th) so flights will be diminished, unless a north front moves through that stirs up insect activity.
Sunset: 8:32 pm
Dark: 9:02 pm (10-20 min. earlier if cloudy)
Sunrise: 6:29 am
Sunday June 8, 2025
Flight: 8:52 pm
Notes:~25 minutes after sunset (close to dark) ~77k flew – most went 4 miles NW while some went 4 miles E to altitude) on S Winds at 12 mph – had been S 10-16 mph all afternoon with gusts to 18 mph around 3:30pm, Visibility 10 miles, A Few Clouds, Temp 87°F, Dew Point 71°F rising, 22 Cooling Degree Days, Cloud Base 3648′, RH 59% rising, Heat Index 93°F, BP 29.86 rising, sea level 1009.8mb rising, bats viewable until 10:05 pm under streetlights
Sunday June 8, 2025
Rain from the W, storms developing over SanAnto and Bracken heading SSE, Frio 0:52, Chiroptorium 1:12, Bracken Stuart 1:32, Huber 1:38, McNeil Seguin 1:42, 410&IH35 SanPedro BalconesHeights Camden D’Hanis 1:46, OldTunnel DavisBlowout WellsBranch Wimberley Lockhart SanMarcos SMCenterpoint SCUCISD SchertzClemens TX28 SMRB(Slayden) Ney 1:54, NLamar Crestwood&IH35 1:56, Congress(~18% of the colony went 18 miles ESE – 14% of those went to altitude) Wimberley2 2:00, Loyola 2:02, SmythCrossing 2:04, FosterRd SanAngelo OCFisher 2:10, EaglePass 2:12, Temple 2:16, GrapeCreek 2:22,
when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are giving birth these days (average date of birth around June 10th) so flights will be diminished, unless a north front moves through that stirs up insect activity.
Sunset: 8:31 pm
Dark: 9:01 pm (10-20 min. earlier if cloudy)
Sunrise: 6:29 am
Saturday June 7, 2025
Flight: 8:56 pm
Notes:~25 minutes after sunset (close to dark) ~77k flew – most went 4 miles NW while some went 4 miles E to altitude) on S Winds at 12 mph – had been S 10-16 mph all afternoon with gusts to 18 mph around 3:30pm, Visibility 10 miles, A Few Clouds, Temp 87°F, Dew Point 71°F rising, 22 Cooling Degree Days, Cloud Base 3648′, RH 59% rising, Heat Index 93°F, BP 29.86 rising, sea level 1009.8mb rising, bats viewable until 10:05 pm under streetlights