Trout Point Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trout Point Lodge clear sky chart from 2005-11-06 to 2024-02-20.

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	22% 11% 4 8% 6% 3 4 4 4 6% 29%	78409
	Night	21% 12% 5% 9% 6% 3 4 4 4 6% 26%	80745
Transparency	Day	56% 5% 10% 17% 10% 1	78114
	Night	59% 6% 9% 16% 8% 1	80575
Seeing	Day	32% 17% 29% 15% 5% 1	15700
	Night	30% 15% 29% 21% 6%	23670

By Month

Percentage Cloud Cover NE (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	20% 16% 7% 13% 10% 4 4 4 4 4 15%	2221
	11th to 20th	Day	20% 18% 7% 17% 8% 4 3 3 3 4 13%	2782
	21st to end	Day	21% 13% 8% 15% 9% 4 3 3 3 4 18%	3124
February	1st to 10th	Day	20% 18% 9% 11% 9% 4 5% 5% 3 5% 13%	1710
	11th to 20th	Day	17% 17% 7% 13% 12% 4 4 3 3 4 16%	1654
	21st to end	Day	13% 16% 8% 10% 10% 4 4 4 4 5% 24%	1429
March	1st to 10th	Day	19% 15% 6% 11% 8% 3 4 4 3 5% 24%	1934
	11th to 20th	Day	18% 12% 6% 9% 7% 3 3 4 4 6% 28%	1980
	21st to end	Day	20% 13% 5% 8% 6% 3 4 3 3 5% 30%	2178
April	1st to 10th	Day	26% 15% 3 6% 5% 3 4 3 4 5% 27%	2075
	11th to 20th	Day	22% 9% 3 4 4 3 3 4 5% 6% 36%	2284
	21st to end	Day	25% 11% 2 5% 5% 2 3 3 4 6% 33%	2340
May	1st to 10th	Day	25% 11% 4 7% 6% 2 3 4 3 5% 29%	2340
	11th to 20th	Day	22% 8% 3 5% 4 2 3 4 5% 7% 37%	2394
	21st to end	Day	24% 9% 3 5% 4 2 4 4 5% 7% 33%	2724
June	1st to 10th	Day	26% 9% 3 5% 4 3 3 4 4 7% 32%	2577
	11th to 20th	Day	23% 6% 3 5% 5% 3 4 4 5% 7% 36%	2700
	21st to end	Day	26% 7% 3 6% 4 2 4 4 6% 6% 31%	2700
July	1st to 10th	Day	21% 7% 3 5% 4 3 4 5% 5% 8% 37%	2700
	11th to 20th	Day	21% 6% 2 5% 5% 3 5% 4 6% 7% 34%	2549
	21st to end	Day	23% 7% 3 5% 5% 3 5% 5% 6% 6% 32%	2548
August	1st to 10th	Day	19% 7% 3 5% 4 3 4 6% 5% 8% 36%	2327
	11th to 20th	Day	19% 7% 3 6% 6% 3 5% 4 4 6% 36%	2304
	21st to end	Day	18% 6% 2 5% 4 2 4 5% 5% 7% 42%	2538
September	1st to 10th	Day	18% 5% 2 4 4 2 4 3 4 7% 46%	2157
	11th to 20th	Day	18% 5% 2 6% 5% 2 3 3 5% 6% 44%	1980
	21st to end	Day	22% 7% 2 4 4 2 3 3 4 6% 42%	1980
October	1st to 10th	Day	21% 7% 2 6% 5% 3 3 4 5% 7% 38%	1814
	11th to 20th	Day	22% 9% 2 6% 5% 3 5% 4 5% 6% 33%	1800
	21st to end	Day	23% 10% 4 8% 5% 3 4 4 5% 5% 29%	1946
November	1st to 10th	Day	22% 10% 3 6% 4 3 4 4 4 6% 33%	1627
	11th to 20th	Day	21% 16% 6% 9% 5% 3 4 4 5% 6% 23%	1520
	21st to end	Day	21% 18% 6% 10% 6% 3 5% 4 3 5% 19%	1520
December	1st to 10th	Day	25% 18% 7% 10% 7% 3 5% 3 3 4 16%	1520
	11th to 20th	Day	27% 16% 6% 11% 6% 4 5% 3 4 5% 12%	1906
	21st to end	Day	23% 15% 10% 11% 8% 3 3 3 3 4 16%	2527
January	1st to 10th	Night	17% 14% 7% 20% 9% 4 5% 4 3 3 14%	4717
	11th to 20th	Night	20% 18% 7% 17% 8% 4 4 3 3 4 12%	4172
	21st to end	Night	19% 15% 6% 15% 9% 4 5% 5% 4 4 15%	4532
February	1st to 10th	Night	20% 15% 6% 12% 9% 5% 5% 5% 5% 4 14%	2470
	11th to 20th	Night	18% 14% 6% 11% 12% 5% 5% 5% 4 4 16%	2397
	21st to end	Night	13% 13% 6% 11% 8% 6% 6% 6% 4 6% 21%	1826
March	1st to 10th	Night	16% 12% 5% 11% 8% 3 4 4 4 5% 26%	2012
	11th to 20th	Night	20% 10% 5% 9% 8% 4 5% 5% 4 5% 25%	1979
	21st to end	Night	18% 10% 5% 8% 5% 3 4 4 4 6% 32%	2178
April	1st to 10th	Night	24% 13% 3 6% 5% 3 4 3 5% 5% 28%	1883
	11th to 20th	Night	23% 8% 3 6% 5% 3 5% 4 4 7% 32%	1622
	21st to end	Night	24% 11% 3 5% 4 2 4 4 5% 6% 31%	1620
May	1st to 10th	Night	21% 10% 4 7% 4 3 4 4 4 7% 31%	1620
	11th to 20th	Night	23% 9% 2 7% 5% 2 5% 3 5% 6% 32%	1498
	21st to end	Night	21% 11% 4 6% 5% 2 3 4 5% 7% 32%	1550
June	1st to 10th	Night	27% 8% 3 5% 4 2 5% 5% 4 8% 28%	1396
	11th to 20th	Night	21% 8% 3 6% 5% 2 4 4 6% 7% 34%	1260
	21st to end	Night	25% 9% 4 6% 5% 3 4 4 5% 6% 28%	1260
July	1st to 10th	Night	22% 7% 3 6% 5% 3 5% 5% 6% 7% 32%	1260
	11th to 20th	Night	22% 8% 4 6% 6% 3 4 5% 7% 8% 26%	1384
	21st to end	Night	21% 7% 3 6% 6% 3 4 4 7% 7% 31%	1770
August	1st to 10th	Night	18% 9% 3 6% 4 2 3 4 5% 8% 37%	1612
	11th to 20th	Night	22% 9% 3 7% 5% 3 4 4 4 7% 32%	1596
	21st to end	Night	17% 7% 2 6% 5% 3 4 4 6% 7% 40%	1818
September	1st to 10th	Night	18% 7% 2 4 4 2 4 4 5% 8% 42%	1800
	11th to 20th	Night	21% 6% 2 4 5% 2 4 3 4 6% 44%	1980
	21st to end	Night	22% 7% 3 5% 4 3 3 3 4 7% 39%	1980
October	1st to 10th	Night	21% 7% 2 5% 5% 3 4 3 5% 6% 38%	2146
	11th to 20th	Night	19% 9% 3 6% 4 2 4 4 5% 6% 38%	2160
	21st to end	Night	25% 11% 4 7% 4 3 4 4 4 5% 29%	2407
November	1st to 10th	Night	21% 10% 3 6% 5% 3 4 5% 5% 7% 31%	2449
	11th to 20th	Night	21% 13% 4 8% 6% 4 6% 5% 5% 6% 23%	2660
	21st to end	Night	20% 15% 6% 9% 7% 3 4 4 5% 6% 23%	2660
December	1st to 10th	Night	26% 16% 6% 10% 6% 3 4 4 5% 5% 16%	2660
	11th to 20th	Night	27% 14% 6% 9% 7% 3 4 4 4 5% 16%	3293
	21st to end	Night	24% 15% 8% 11% 6% 3 4 4 3 3 20%	5118

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	70% 9% 12% 8% 2	2222
	11th to 20th	Day	74% 7% 8% 8% 3	2782
	21st to end	Day	71% 6% 8% 9% 6%	3124
February	1st to 10th	Day	75% 6% 8% 7% 5%	1710
	11th to 20th	Day	73% 5% 6% 11% 4	1662
	21st to end	Day	62% 6% 10% 15% 6% 2	1429
March	1st to 10th	Day	64% 4 9% 14% 7% 1	1938
	11th to 20th	Day	57% 5% 9% 16% 12% 1	1980
	21st to end	Day	58% 3 8% 18% 11% 2	2178
April	1st to 10th	Day	61% 3 8% 14% 12% 1	2075
	11th to 20th	Day	49% 5% 10% 23% 12% 1	2284
	21st to end	Day	53% 4 9% 18% 13% 2	2340
May	1st to 10th	Day	59% 4 7% 19% 10% 2	2340
	11th to 20th	Day	48% 5% 9% 22% 14% 2	2398
	21st to end	Day	51% 6% 12% 19% 12% 1	2724
June	1st to 10th	Day	54% 4 9% 21% 11% 1	2577
	11th to 20th	Day	50% 4 11% 19% 14% 2	2700
	21st to end	Day	53% 6% 11% 19% 9% 1	2700
July	1st to 10th	Day	45% 6% 13% 21% 13% 2	2625
	11th to 20th	Day	48% 6% 13% 22% 10% 1	2468
	21st to end	Day	50% 7% 13% 21% 8% 1	2406
August	1st to 10th	Day	45% 6% 13% 22% 12% 1	2314
	11th to 20th	Day	48% 7% 12% 22% 11%	2304
	21st to end	Day	41% 6% 11% 24% 16% 1	2538
September	1st to 10th	Day	40% 5% 11% 23% 19% 2	2157
	11th to 20th	Day	42% 4 10% 25% 17% 3	1980
	21st to end	Day	45% 4 7% 23% 19% 2	1980
October	1st to 10th	Day	46% 5% 10% 26% 12% 1	1814
	11th to 20th	Day	51% 6% 11% 22% 10%	1800
	21st to end	Day	57% 5% 9% 17% 11% 1	1946
November	1st to 10th	Day	53% 5% 11% 20% 9% 1	1627
	11th to 20th	Day	62% 7% 10% 15% 6%	1520
	21st to end	Day	67% 7% 10% 13% 3	1520
December	1st to 10th	Day	72% 6% 8% 12% 3	1520
	11th to 20th	Day	74% 6% 7% 8% 4	1905
	21st to end	Day	70% 8% 13% 7% 2	2527
January	1st to 10th	Night	72% 8% 7% 10% 2	4717
	11th to 20th	Night	75% 7% 7% 9% 3	4172
	21st to end	Night	71% 8% 7% 10% 4	4532
February	1st to 10th	Night	71% 7% 8% 9% 5%	2470
	11th to 20th	Night	70% 7% 6% 11% 5%	2400
	21st to end	Night	61% 8% 10% 14% 7% 1	1826
March	1st to 10th	Night	60% 5% 9% 16% 8% 1	2021
	11th to 20th	Night	60% 5% 11% 13% 11% 1	1980
	21st to end	Night	52% 6% 9% 19% 12% 2	2178
April	1st to 10th	Night	58% 5% 8% 14% 12% 2	1883
	11th to 20th	Night	51% 6% 8% 21% 12% 1	1622
	21st to end	Night	53% 5% 10% 18% 12% 1	1620
May	1st to 10th	Night	55% 4 9% 20% 11% 1	1620
	11th to 20th	Night	52% 5% 6% 24% 11% 1	1499
	21st to end	Night	52% 6% 13% 20% 9% 1	1551
June	1st to 10th	Night	55% 5% 9% 22% 7% 1	1396
	11th to 20th	Night	50% 6% 11% 20% 12% 1	1260
	21st to end	Night	57% 6% 10% 16% 10% 2	1260
July	1st to 10th	Night	50% 8% 14% 19% 9%	1225
	11th to 20th	Night	53% 8% 12% 17% 9% 1	1342
	21st to end	Night	51% 6% 13% 21% 8% 1	1672
August	1st to 10th	Night	47% 5% 12% 26% 10%	1600
	11th to 20th	Night	52% 7% 11% 21% 9%	1596
	21st to end	Night	42% 8% 12% 24% 14% 1	1818
September	1st to 10th	Night	40% 6% 10% 29% 14% 1	1800
	11th to 20th	Night	42% 4 8% 28% 16% 2	1980
	21st to end	Night	47% 5% 7% 22% 17% 2	1980
October	1st to 10th	Night	47% 5% 11% 22% 14% 2	2146
	11th to 20th	Night	46% 5% 13% 25% 11%	2160
	21st to end	Night	56% 6% 9% 18% 10% 1	2407
November	1st to 10th	Night	52% 7% 12% 19% 9%	2449
	11th to 20th	Night	60% 8% 11% 16% 6%	2660
	21st to end	Night	62% 7% 14% 13% 4	2660
December	1st to 10th	Night	70% 6% 9% 12% 3	2660
	11th to 20th	Night	70% 7% 8% 12% 4	3295
	21st to end	Night	67% 7% 10% 13% 3	5118

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	42% 21% 28% 6% 2	180
	11th to 20th	Day	38% 22% 26% 10% 3	338
	21st to end	Day	28% 23% 35% 12% 2	407
February	1st to 10th	Day	37% 19% 31% 11% 2	370
	11th to 20th	Day	39% 27% 21% 10% 2	363
	21st to end	Day	35% 21% 29% 12% 3	324
March	1st to 10th	Day	34% 23% 32% 8% 3	420
	11th to 20th	Day	38% 24% 23% 9% 5% 1	420
	21st to end	Day	32% 24% 27% 11% 5% 1	462
April	1st to 10th	Day	45% 22% 23% 7% 3	420
	11th to 20th	Day	35% 22% 30% 10% 2	412
	21st to end	Day	39% 17% 28% 11% 5% 1	420
May	1st to 10th	Day	37% 25% 26% 8% 2 1	423
	11th to 20th	Day	32% 18% 29% 16% 3 1	540
	21st to end	Day	34% 14% 31% 17% 4 1	680
June	1st to 10th	Day	37% 13% 29% 16% 5% 1	630
	11th to 20th	Day	27% 15% 31% 20% 5% 1	630
	21st to end	Day	34% 12% 28% 19% 6% 1	630
July	1st to 10th	Day	27% 12% 29% 21% 10% 1	620
	11th to 20th	Day	25% 10% 33% 23% 8% 1	570
	21st to end	Day	25% 12% 35% 21% 6% 1	488
August	1st to 10th	Day	21% 12% 37% 21% 7% 1	446
	11th to 20th	Day	25% 10% 35% 18% 10% 2	439
	21st to end	Day	25% 13% 30% 19% 10% 2	495
September	1st to 10th	Day	19% 15% 36% 21% 7% 2	450
	11th to 20th	Day	26% 15% 32% 16% 6% 4	450
	21st to end	Day	25% 16% 34% 16% 7% 3	450
October	1st to 10th	Day	28% 13% 27% 20% 9% 3	367
	11th to 20th	Day	29% 13% 31% 18% 6% 3	360
	21st to end	Day	32% 21% 26% 13% 7% 1	396
November	1st to 10th	Day	31% 17% 28% 16% 6% 1	365
	11th to 20th	Day	38% 18% 27% 12% 4 1	370
	21st to end	Day	35% 22% 29% 10% 3 1	370
December	1st to 10th	Day	38% 20% 27% 11% 2	370
	11th to 20th	Day	45% 22% 21% 10% 2	370
	21st to end	Day	44% 22% 21% 9% 4 1	255
January	1st to 10th	Night	33% 22% 27% 16% 2	841
	11th to 20th	Night	37% 16% 27% 16% 3	760
	21st to end	Night	27% 22% 31% 16% 4	836
February	1st to 10th	Night	35% 16% 30% 17% 2	760
	11th to 20th	Night	34% 23% 24% 16% 3	742
	21st to end	Night	25% 20% 34% 16% 5%	592
March	1st to 10th	Night	28% 20% 33% 18% 3	720
	11th to 20th	Night	29% 19% 28% 19% 6%	720
	21st to end	Night	27% 16% 33% 17% 6% 1	792
April	1st to 10th	Night	37% 16% 31% 15% 1	623
	11th to 20th	Night	29% 18% 35% 15% 3	534
	21st to end	Night	34% 14% 29% 18% 6%	540
May	1st to 10th	Night	29% 17% 34% 17% 3	540
	11th to 20th	Night	30% 11% 35% 19% 4	532
	21st to end	Night	27% 10% 37% 21% 4 1	583
June	1st to 10th	Night	33% 9% 33% 20% 5%	496
	11th to 20th	Night	24% 9% 32% 28% 5% 1	360
	21st to end	Night	32% 3 33% 25% 7%	360
July	1st to 10th	Night	25% 5% 33% 30% 7%	350
	11th to 20th	Night	23% 9% 35% 24% 9%	428
	21st to end	Night	23% 4 37% 30% 6%	590
August	1st to 10th	Night	21% 7% 31% 31% 9% 1	538
	11th to 20th	Night	26% 8% 27% 31% 8%	532
	21st to end	Night	20% 7% 31% 30% 12% 1	594
September	1st to 10th	Night	22% 8% 30% 29% 10%	540
	11th to 20th	Night	25% 10% 27% 23% 14% 2	720
	21st to end	Night	26% 11% 26% 26% 10% 2	720
October	1st to 10th	Night	28% 10% 24% 27% 11% 1	720
	11th to 20th	Night	25% 14% 28% 24% 9% 1	720
	21st to end	Night	34% 16% 24% 21% 5%	792
November	1st to 10th	Night	28% 13% 27% 23% 8% 1	760
	11th to 20th	Night	32% 16% 26% 20% 6%	850
	21st to end	Night	31% 21% 24% 18% 5%	850
December	1st to 10th	Night	37% 16% 27% 17% 3	850
	11th to 20th	Night	38% 20% 25% 14% 3	850
	21st to end	Night	36% 21% 22% 18% 3	935

Page generated at 2024-02-17 07:28:38. Version ac07

Copyright 2024 Attilla Danko