Fire Panther Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fire Panther Observatory clear sky chart from 2005-11-06 to 2025-12-18.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	13% 7% 3 7% 5% 5% 5% 4 6% 7% 39%	126822
	Night	13% 7% 3 6% 4 4 4 3 5% 7% 43%	124217
Transparency	Day	41% 7% 11% 20% 17% 4	130571
	Night	38% 6% 11% 21% 19% 5%	128536
Seeing	Day	17% 13% 24% 22% 16% 7%	16141
	Night	16% 10% 23% 29% 19% 4	26155

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 10% 5% 5% 3 3 3 3 4 4 44%	4056
	11th to 20th	Day	14% 7% 3 10% 3 3 2 2 3 4 49%	4060
	21st to end	Day	22% 10% 3 5% 3 3 3 3 4 5% 39%	4807
February	1st to 10th	Day	17% 10% 3 7% 4 5% 4 3 4 6% 38%	2000
	11th to 20th	Day	21% 9% 3 7% 5% 4 4 3 4 5% 36%	1948
	21st to end	Day	19% 9% 2 6% 5% 3 5% 3 4 5% 38%	1650
March	1st to 10th	Day	18% 10% 4 8% 4 5% 4 4 5% 5% 32%	4480
	11th to 20th	Day	12% 8% 2 6% 3 3 4 4 4 6% 47%	4934
	21st to end	Day	14% 7% 3 7% 4 4 4 4 5% 7% 41%	5465
April	1st to 10th	Day	11% 8% 2 5% 6% 4 4 4 6% 7% 42%	2394
	11th to 20th	Day	12% 7% 2 7% 5% 4 4 3 5% 6% 45%	2374
	21st to end	Day	10% 6% 2 7% 6% 3 5% 4 6% 8% 43%	2490
May	1st to 10th	Day	16% 8% 3 7% 5% 5% 5% 4 6% 8% 34%	5862
	11th to 20th	Day	17% 8% 3 8% 6% 6% 5% 4 7% 8% 28%	5861
	21st to end	Day	16% 7% 3 6% 4 4 5% 4 6% 7% 38%	6433
June	1st to 10th	Day	10% 6% 3 8% 6% 6% 6% 5% 7% 9% 35%	2600
	11th to 20th	Day	4 5% 2 6% 6% 6% 6% 6% 9% 11% 39%	2600
	21st to end	Day	7% 5% 3 7% 6% 6% 6% 5% 8% 11% 38%	2600
July	1st to 10th	Day	7% 5% 3 7% 6% 6% 7% 6% 7% 10% 35%	5900
	11th to 20th	Day	7% 5% 2 7% 6% 7% 7% 7% 9% 13% 29%	5900
	21st to end	Day	11% 9% 3 10% 8% 7% 7% 6% 8% 10% 21%	6424
August	1st to 10th	Day	5% 4 1 5% 5% 5% 6% 6% 8% 11% 43%	4138
	11th to 20th	Day	7% 5% 2 6% 5% 5% 7% 6% 8% 10% 39%	3849
	21st to end	Day	8% 4 2 7% 5% 5% 6% 4 6% 7% 47%	4312
September	1st to 10th	Day	10% 7% 3 6% 6% 5% 5% 6% 6% 7% 37%	2285
	11th to 20th	Day	15% 6% 2 6% 5% 5% 5% 4 5% 8% 39%	2200
	21st to end	Day	13% 6% 2 6% 4 4 4 3 5% 7% 45%	2200
October	1st to 10th	Day	11% 6% 2 5% 3 4 4 3 5% 6% 52%	2200
	11th to 20th	Day	9% 6% 3 5% 3 3 4 3 4 6% 56%	2156
	21st to end	Day	15% 5% 2 5% 3 3 4 3 5% 5% 51%	2090
November	1st to 10th	Day	12% 6% 2 5% 3 3 3 3 4 6% 52%	1852
	11th to 20th	Day	12% 5% 2 6% 4 3 4 4 5% 6% 49%	1890
	21st to end	Day	14% 7% 2 5% 4 4 4 3 5% 6% 45%	1890
December	1st to 10th	Day	17% 8% 2 7% 4 4 3 3 3 5% 44%	3020
	11th to 20th	Day	14% 11% 4 9% 5% 5% 4 3 4 5% 36%	3436
	21st to end	Day	16% 9% 5% 8% 4 3 4 3 5% 7% 36%	4466
January	1st to 10th	Night	14% 11% 3 8% 3 3 3 3 4 5% 43%	5889
	11th to 20th	Night	16% 8% 4 8% 3 3 2 2 3 4 47%	5900
	21st to end	Night	17% 10% 2 6% 3 4 3 3 4 5% 42%	6145
February	1st to 10th	Night	15% 9% 3 6% 5% 3 4 3 5% 6% 42%	2400
	11th to 20th	Night	20% 8% 4 7% 5% 4 4 3 4 4 38%	2338
	21st to end	Night	19% 8% 3 6% 4 4 4 4 5% 6% 36%	1980
March	1st to 10th	Night	22% 11% 4 7% 5% 4 4 3 5% 5% 31%	5373
	11th to 20th	Night	10% 7% 2 6% 4 3 4 4 5% 7% 47%	5012
	21st to end	Night	14% 8% 3 8% 5% 4 4 3 4 5% 41%	5467
April	1st to 10th	Night	11% 5% 2 4 4 4 5% 4 7% 7% 47%	2021
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 5% 7% 50%	1975
	21st to end	Night	10% 6% 2 6% 4 3 4 4 5% 8% 48%	1906
May	1st to 10th	Night	12% 8% 3 9% 5% 5% 5% 4 6% 8% 35%	4033
	11th to 20th	Night	19% 9% 2 9% 6% 5% 5% 4 6% 7% 28%	4032
	21st to end	Night	13% 7% 3 6% 4 4 5% 4 7% 9% 38%	4421
June	1st to 10th	Night	7% 6% 2 7% 6% 6% 5% 4 9% 10% 39%	1800
	11th to 20th	Night	4 4 2 6% 4 4 3 5% 7% 12% 50%	1800
	21st to end	Night	5% 4 2 6% 5% 4 6% 4 8% 12% 45%	1800
July	1st to 10th	Night	7% 5% 2 7% 5% 5% 6% 5% 9% 10% 38%	4058
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 5% 9% 14% 39%	4057
	21st to end	Night	9% 7% 3 8% 5% 6% 6% 5% 7% 11% 32%	4427
August	1st to 10th	Night	5% 3 1 4 4 4 5% 5% 8% 11% 49%	3006
	11th to 20th	Night	7% 4 2 6% 4 3 4 3 6% 9% 50%	3200
	21st to end	Night	7% 4 1 4 3 4 4 4 6% 8% 56%	3586
September	1st to 10th	Night	9% 7% 3 6% 4 4 5% 4 7% 9% 42%	2093
	11th to 20th	Night	13% 6% 2 6% 4 4 4 4 7% 8% 44%	2200
	21st to end	Night	12% 5% 2 5% 4 3 4 4 5% 7% 50%	2200
October	1st to 10th	Night	11% 4 2 5% 3 3 3 2 3 6% 58%	2200
	11th to 20th	Night	11% 5% 2 5% 4 3 4 2 4 4 56%	2241
	21st to end	Night	13% 6% 2 5% 4 2 3 3 4 5% 53%	2747
November	1st to 10th	Night	13% 5% 2 4 4 3 3 3 5% 5% 52%	2666
	11th to 20th	Night	12% 6% 2 5% 3 3 3 2 5% 6% 52%	2730
	21st to end	Night	14% 8% 3 6% 4 3 4 3 5% 5% 45%	2730
December	1st to 10th	Night	16% 9% 3 6% 4 3 3 3 4 5% 45%	4380
	11th to 20th	Night	18% 11% 3 6% 3 3 3 2 3 4 42%	4914
	21st to end	Night	17% 8% 5% 8% 4 4 4 3 5% 6% 35%	6490

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	43% 3 6% 22% 23% 3	4057
	11th to 20th	Day	41% 3 5% 19% 29% 4	4060
	21st to end	Day	47% 3 7% 18% 20% 5%	4807
February	1st to 10th	Day	47% 4 7% 21% 19% 3	2000
	11th to 20th	Day	51% 4 5% 19% 16% 5%	1958
	21st to end	Day	48% 4 8% 14% 21% 5%	1650
March	1st to 10th	Day	51% 6% 7% 10% 19% 7%	4480
	11th to 20th	Day	37% 5% 6% 18% 22% 13%	4934
	21st to end	Day	43% 5% 9% 25% 16% 2	5465
April	1st to 10th	Day	39% 6% 10% 22% 17% 5%	2394
	11th to 20th	Day	38% 4 8% 21% 23% 6%	2374
	21st to end	Day	38% 5% 11% 28% 16% 2	2490
May	1st to 10th	Day	45% 9% 13% 21% 11% 1	5897
	11th to 20th	Day	51% 8% 14% 19% 8%	5865
	21st to end	Day	43% 7% 9% 23% 17% 2	6447
June	1st to 10th	Day	42% 9% 15% 21% 12% 2	2600
	11th to 20th	Day	33% 9% 17% 25% 13% 2	2600
	21st to end	Day	36% 11% 17% 21% 13% 3	2600
July	1st to 10th	Day	39% 11% 18% 22% 9% 1	5835
	11th to 20th	Day	40% 14% 25% 16% 4 1	5831
	21st to end	Day	53% 13% 17% 14% 4	6240
August	1st to 10th	Day	29% 10% 14% 35% 11%	4125
	11th to 20th	Day	33% 10% 17% 25% 13% 2	3885
	21st to end	Day	34% 9% 12% 26% 19% 2	4311
September	1st to 10th	Day	42% 9% 13% 16% 15% 5%	2285
	11th to 20th	Day	42% 7% 11% 21% 17% 2	2200
	21st to end	Day	38% 5% 12% 18% 20% 7%	2200
October	1st to 10th	Day	25% 5% 6% 15% 38% 12%	3590
	11th to 20th	Day	21% 3 6% 18% 32% 20%	3487
	21st to end	Day	28% 4 7% 24% 27% 11%	3353
November	1st to 10th	Day	34% 4 8% 18% 29% 8%	1852
	11th to 20th	Day	35% 4 6% 21% 25% 8%	1890
	21st to end	Day	40% 3 6% 21% 24% 5%	1890
December	1st to 10th	Day	44% 3 5% 16% 27% 5%	3020
	11th to 20th	Day	50% 4 7% 18% 16% 5%	3433
	21st to end	Day	46% 4 10% 24% 14% 2	4466
January	1st to 10th	Night	44% 3 7% 21% 21% 3	5889
	11th to 20th	Night	42% 3 5% 19% 25% 7%	5900
	21st to end	Night	44% 3 5% 19% 23% 7%	6145
February	1st to 10th	Night	43% 4 8% 19% 21% 5%	2400
	11th to 20th	Night	50% 4 6% 17% 16% 6%	2339
	21st to end	Night	47% 4 8% 15% 19% 6%	1980
March	1st to 10th	Night	53% 5% 6% 13% 19% 4	5373
	11th to 20th	Night	34% 5% 7% 18% 21% 15%	5012
	21st to end	Night	45% 4 7% 23% 18% 4	5467
April	1st to 10th	Night	33% 6% 13% 22% 21% 5%	2021
	11th to 20th	Night	34% 4 8% 23% 22% 10%	1975
	21st to end	Night	33% 6% 12% 27% 19% 3	1906
May	1st to 10th	Night	44% 10% 15% 18% 12% 1	4060
	11th to 20th	Night	51% 9% 14% 18% 8%	4033
	21st to end	Night	38% 8% 14% 24% 14% 1	4429
June	1st to 10th	Night	36% 9% 17% 21% 14% 2	1800
	11th to 20th	Night	25% 9% 20% 28% 16% 2	1800
	21st to end	Night	29% 10% 18% 24% 14% 5%	1800
July	1st to 10th	Night	36% 12% 19% 24% 8% 1	4015
	11th to 20th	Night	32% 12% 31% 19% 5% 2	4006
	21st to end	Night	44% 11% 22% 18% 4 1	4297
August	1st to 10th	Night	25% 10% 17% 35% 12% 1	2995
	11th to 20th	Night	28% 8% 22% 25% 15% 1	3230
	21st to end	Night	25% 8% 15% 24% 26% 2	3586
September	1st to 10th	Night	36% 9% 17% 19% 15% 5%	2093
	11th to 20th	Night	37% 7% 13% 20% 21% 2	2200
	21st to end	Night	33% 6% 12% 22% 21% 7%	2200
October	1st to 10th	Night	21% 5% 7% 20% 31% 16%	3590
	11th to 20th	Night	20% 3 4 18% 33% 22%	3649
	21st to end	Night	25% 3 5% 26% 29% 12%	4434
November	1st to 10th	Night	34% 4 9% 20% 24% 10%	2666
	11th to 20th	Night	33% 3 6% 21% 27% 10%	2730
	21st to end	Night	40% 3 6% 22% 22% 6%	2730
December	1st to 10th	Night	42% 4 5% 19% 26% 4	4380
	11th to 20th	Night	46% 4 6% 17% 23% 4	4916
	21st to end	Night	46% 4 10% 23% 15% 1	6490

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	27% 29% 32% 11% 2	300
	11th to 20th	Day	29% 28% 31% 7% 5% 1	300
	21st to end	Day	23% 32% 32% 11% 2	330
February	1st to 10th	Day	28% 25% 33% 10% 3	300
	11th to 20th	Day	42% 25% 26% 5% 1	300
	21st to end	Day	34% 28% 32% 5% 2	249
March	1st to 10th	Day	29% 24% 30% 11% 4 1	300
	11th to 20th	Day	25% 25% 27% 18% 5%	480
	21st to end	Day	22% 19% 37% 16% 5%	550
April	1st to 10th	Day	19% 24% 29% 17% 9% 2	500
	11th to 20th	Day	17% 20% 32% 19% 11% 1	492
	21st to end	Day	17% 14% 33% 21% 12% 2	500
May	1st to 10th	Day	15% 14% 34% 21% 11% 4	503
	11th to 20th	Day	14% 10% 25% 28% 14% 9%	527
	21st to end	Day	18% 7% 21% 25% 19% 11%	573
June	1st to 10th	Day	14% 6% 20% 29% 18% 12%	530
	11th to 20th	Day	5% 5% 17% 30% 24% 18%	530
	21st to end	Day	9% 3 19% 29% 23% 16%	530
July	1st to 10th	Day	10% 3 13% 26% 28% 19%	525
	11th to 20th	Day	9% 3 11% 25% 32% 20%	524
	21st to end	Day	10% 3 11% 25% 30% 22%	576
August	1st to 10th	Day	12% 4 13% 27% 28% 16%	526
	11th to 20th	Day	12% 4 13% 30% 28% 13%	519
	21st to end	Day	14% 3 12% 26% 30% 15%	583
September	1st to 10th	Day	11% 4 15% 31% 26% 12%	530
	11th to 20th	Day	16% 5% 14% 25% 29% 11%	530
	21st to end	Day	16% 7% 17% 30% 26% 5%	530
October	1st to 10th	Day	13% 6% 24% 28% 21% 7%	530
	11th to 20th	Day	12% 11% 28% 32% 15% 1	530
	21st to end	Day	19% 11% 30% 25% 13% 2	473
November	1st to 10th	Day	21% 13% 33% 23% 9% 1	330
	11th to 20th	Day	16% 18% 42% 21% 4	330
	21st to end	Day	20% 25% 33% 16% 5% 2	330
December	1st to 10th	Day	29% 23% 33% 12% 2 1	330
	11th to 20th	Day	22% 21% 34% 17% 6%	321
	21st to end	Day	31% 19% 31% 15% 3 1	330
January	1st to 10th	Night	23% 22% 32% 21% 4	800
	11th to 20th	Night	23% 19% 30% 23% 6%	800
	21st to end	Night	20% 19% 35% 25% 2	880
February	1st to 10th	Night	21% 14% 35% 27% 4	800
	11th to 20th	Night	26% 22% 31% 19% 2	783
	21st to end	Night	25% 20% 32% 20% 2	660
March	1st to 10th	Night	20% 16% 32% 27% 4	800
	11th to 20th	Night	19% 18% 30% 26% 7% 1	800
	21st to end	Night	18% 15% 31% 27% 9%	880
April	1st to 10th	Night	14% 18% 28% 30% 10%	621
	11th to 20th	Night	15% 10% 33% 29% 11% 1	593
	21st to end	Night	12% 9% 28% 36% 14% 1	600
May	1st to 10th	Night	9% 7% 29% 33% 19% 2	600
	11th to 20th	Night	15% 6% 22% 31% 21% 6%	591
	21st to end	Night	11% 4 13% 34% 33% 5%	650
June	1st to 10th	Night	8% 2 15% 36% 34% 5%	600
	11th to 20th	Night	4 2 12% 36% 35% 11%	600
	21st to end	Night	5% 2 11% 30% 42% 10%	600
July	1st to 10th	Night	9% 2 8% 25% 44% 12%	585
	11th to 20th	Night	9% 2 6% 26% 43% 14%	582
	21st to end	Night	8% 1 9% 26% 45% 11%	657
August	1st to 10th	Night	9% 2 5% 25% 47% 13%	597
	11th to 20th	Night	11% 3 10% 29% 40% 7%	594
	21st to end	Night	13% 2 9% 27% 40% 10%	660
September	1st to 10th	Night	10% 2 11% 33% 35% 8%	693
	11th to 20th	Night	14% 3 11% 29% 37% 6%	800
	21st to end	Night	14% 4 16% 30% 34% 3	800
October	1st to 10th	Night	13% 5% 20% 30% 27% 6%	800
	11th to 20th	Night	14% 9% 25% 33% 19% 1	800
	21st to end	Night	17% 8% 21% 36% 16% 3	880
November	1st to 10th	Night	17% 8% 21% 34% 18% 2	820
	11th to 20th	Night	14% 13% 31% 31% 10% 1	840
	21st to end	Night	19% 14% 27% 29% 11% 1	840
December	1st to 10th	Night	22% 17% 26% 27% 7%	840
	11th to 20th	Night	20% 14% 29% 27% 9%	829
	21st to end	Night	24% 16% 24% 29% 6%	880

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