Fisher's Paradise
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fisher's Paradise clear sky chart from 2005-11-06 to 2024-01-12.

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	18% 11% 4 7% 6% 3 5% 5% 5% 7% 30%	74697
	Night	18% 12% 4 8% 6% 3 4 4 4 6% 30%	75022
Transparency	Day	54% 4 12% 20% 9% 1	74395
	Night	56% 4 11% 19% 9% 1	74859
Seeing	Day	23% 14% 30% 21% 9% 2	14005
	Night	24% 12% 30% 25% 9% 1	23228

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	16% 20% 9% 11% 6% 4 5% 3 5% 5% 17%	1328
	11th to 20th	Day	16% 18% 7% 11% 5% 3 4 4 3 5% 23%	1312
	21st to end	Day	16% 16% 7% 11% 7% 4 5% 4 4 5% 22%	1780
February	1st to 10th	Day	11% 19% 6% 10% 10% 4 6% 5% 5% 5% 20%	1620
	11th to 20th	Day	13% 18% 6% 8% 9% 3 4 4 4 6% 26%	1573
	21st to end	Day	17% 16% 6% 10% 8% 5% 5% 4 4 5% 22%	1358
March	1st to 10th	Day	15% 12% 5% 8% 7% 3 5% 4 4 6% 31%	1939
	11th to 20th	Day	14% 13% 5% 9% 8% 3 5% 4 4 5% 31%	1980
	21st to end	Day	18% 12% 5% 7% 5% 3 3 3 4 6% 36%	2178
April	1st to 10th	Day	21% 12% 5% 7% 5% 3 4 5% 4 8% 26%	2121
	11th to 20th	Day	22% 10% 3 6% 5% 3 4 4 4 6% 34%	2294
	21st to end	Day	23% 12% 3 6% 4 2 4 3 3 5% 35%	2340
May	1st to 10th	Day	20% 8% 4 7% 6% 3 4 4 5% 7% 33%	2394
	11th to 20th	Day	20% 8% 3 6% 6% 3 4 4 5% 7% 33%	2478
	21st to end	Day	17% 7% 3 5% 5% 3 5% 4 5% 7% 39%	2732
June	1st to 10th	Day	19% 8% 4 7% 5% 3 5% 5% 6% 7% 33%	2700
	11th to 20th	Day	14% 6% 3 7% 6% 3 5% 5% 6% 8% 37%	2700
	21st to end	Day	18% 7% 3 6% 6% 4 5% 6% 6% 9% 31%	2700
July	1st to 10th	Day	11% 4 3 5% 5% 4 6% 6% 7% 8% 41%	2700
	11th to 20th	Day	14% 5% 2 6% 6% 3 5% 5% 7% 10% 36%	2700
	21st to end	Day	14% 5% 2 6% 6% 4 6% 7% 6% 9% 36%	2707
August	1st to 10th	Day	16% 6% 3 5% 5% 4 5% 6% 7% 8% 35%	2327
	11th to 20th	Day	16% 5% 3 5% 6% 3 4 6% 6% 9% 37%	2303
	21st to end	Day	16% 7% 2 6% 6% 4 5% 5% 6% 8% 35%	2543
September	1st to 10th	Day	16% 8% 3 6% 5% 3 4 5% 5% 7% 38%	2160
	11th to 20th	Day	17% 6% 3 5% 5% 3 5% 5% 6% 7% 38%	2036
	21st to end	Day	24% 8% 3 5% 6% 3 4 3 6% 6% 33%	1958
October	1st to 10th	Day	19% 9% 3 6% 6% 3 5% 4 5% 5% 34%	1800
	11th to 20th	Day	26% 13% 4 7% 7% 4 3 5% 4 5% 23%	1800
	21st to end	Day	29% 14% 4 7% 6% 4 3 4 4 5% 20%	1918
November	1st to 10th	Day	20% 13% 4 7% 6% 3 4 4 5% 7% 27%	1513
	11th to 20th	Day	19% 14% 6% 9% 6% 5% 5% 5% 3 7% 23%	1520
	21st to end	Day	27% 19% 6% 8% 5% 3 3 4 3 4 17%	1520
December	1st to 10th	Day	17% 19% 8% 9% 7% 3 5% 4 5% 6% 17%	1520
	11th to 20th	Day	18% 19% 6% 9% 5% 3 3 4 4 5% 24%	1714
	21st to end	Day	21% 21% 8% 14% 8% 2 3 3 3 4 15%	2431
January	1st to 10th	Night	18% 18% 7% 11% 8% 4 4 3 3 5% 19%	2838
	11th to 20th	Night	18% 18% 7% 9% 7% 3 5% 4 4 4 21%	2683
	21st to end	Night	15% 12% 7% 10% 8% 4 5% 4 5% 6% 23%	2574
February	1st to 10th	Night	13% 15% 7% 10% 9% 5% 6% 4 5% 6% 23%	2340
	11th to 20th	Night	14% 15% 6% 10% 7% 4 6% 4 4 5% 25%	2273
	21st to end	Night	15% 16% 6% 9% 7% 4 4 4 4 6% 24%	1896
March	1st to 10th	Night	15% 11% 5% 8% 7% 4 4 4 4 6% 32%	2007
	11th to 20th	Night	15% 12% 5% 9% 6% 3 4 4 4 6% 31%	1979
	21st to end	Night	15% 10% 5% 6% 5% 2 4 4 4 6% 38%	2178
April	1st to 10th	Night	21% 12% 5% 7% 6% 2 4 4 4 6% 30%	1838
	11th to 20th	Night	20% 8% 4 7% 6% 3 4 3 4 5% 37%	1630
	21st to end	Night	20% 10% 4 6% 6% 3 4 4 5% 6% 34%	1620
May	1st to 10th	Night	17% 8% 3 7% 5% 3 5% 5% 4 7% 36%	1566
	11th to 20th	Night	16% 6% 3 5% 6% 4 5% 5% 6% 8% 36%	1415
	21st to end	Night	15% 7% 2 6% 5% 3 4 4 5% 6% 45%	1540
June	1st to 10th	Night	14% 7% 3 6% 6% 3 5% 5% 5% 7% 38%	1260
	11th to 20th	Night	14% 6% 2 5% 4 3 4 5% 4 9% 44%	1260
	21st to end	Night	14% 7% 3 5% 5% 4 6% 4 5% 9% 38%	1260
July	1st to 10th	Night	8% 5% 2 6% 5% 3 5% 6% 6% 10% 44%	1260
	11th to 20th	Night	10% 6% 2 5% 5% 4 4 4 5% 9% 45%	1260
	21st to end	Night	10% 5% 2 6% 5% 3 4 5% 6% 10% 44%	1604
August	1st to 10th	Night	12% 6% 3 7% 5% 3 5% 5% 5% 7% 42%	1611
	11th to 20th	Night	12% 5% 3 4 4 4 5% 5% 6% 8% 44%	1598
	21st to end	Night	17% 7% 2 5% 5% 3 4 5% 5% 6% 42%	1795
September	1st to 10th	Night	15% 6% 2 4 4 2 4 4 5% 7% 47%	1800
	11th to 20th	Night	15% 6% 2 5% 4 2 4 3 5% 6% 48%	1921
	21st to end	Night	19% 6% 3 5% 4 3 4 4 6% 7% 40%	2002
October	1st to 10th	Night	20% 7% 3 6% 5% 3 4 4 4 7% 36%	2160
	11th to 20th	Night	29% 10% 3 5% 5% 3 4 3 5% 6% 27%	2160
	21st to end	Night	27% 12% 4 7% 6% 3 4 3 5% 6% 23%	2436
November	1st to 10th	Night	21% 9% 4 7% 5% 3 4 4 5% 6% 32%	2564
	11th to 20th	Night	19% 13% 5% 8% 7% 4 5% 4 4 5% 25%	2660
	21st to end	Night	23% 16% 4 8% 7% 4 4 4 5% 5% 19%	2660
December	1st to 10th	Night	20% 19% 6% 9% 8% 3 4 4 4 5% 19%	2660
	11th to 20th	Night	21% 16% 5% 8% 6% 3 4 5% 5% 6% 21%	3478
	21st to end	Night	22% 20% 7% 14% 7% 3 3 3 3 4 15%	5236

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	71% 4 10% 12% 3	1329
	11th to 20th	Day	66% 1 9% 13% 10% 1	1312
	21st to end	Day	66% 3 7% 16% 7% 1	1780
February	1st to 10th	Day	66% 4 9% 14% 6% 1	1620
	11th to 20th	Day	62% 3 9% 15% 10% 1	1582
	21st to end	Day	66% 3 6% 15% 9%	1358
March	1st to 10th	Day	56% 3 12% 17% 11% 1	1942
	11th to 20th	Day	58% 3 8% 21% 9% 1	1980
	21st to end	Day	52% 2 8% 19% 15% 3	2178
April	1st to 10th	Day	58% 3 11% 18% 9% 1	2121
	11th to 20th	Day	54% 2 6% 25% 11% 1	2294
	21st to end	Day	54% 3 8% 18% 14% 3	2340
May	1st to 10th	Day	51% 4 9% 20% 13% 3	2394
	11th to 20th	Day	51% 4 9% 21% 14% 2	2482
	21st to end	Day	45% 5% 13% 22% 14% 2	2732
June	1st to 10th	Day	50% 4 11% 23% 11% 1	2700
	11th to 20th	Day	45% 4 11% 24% 14% 1	2700
	21st to end	Day	49% 6% 13% 21% 10% 1	2700
July	1st to 10th	Day	37% 5% 16% 29% 11% 1	2626
	11th to 20th	Day	41% 4 15% 30% 9%	2619
	21st to end	Day	45% 5% 14% 27% 8%	2556
August	1st to 10th	Day	44% 5% 17% 25% 9%	2314
	11th to 20th	Day	44% 5% 18% 25% 7% 1	2303
	21st to end	Day	47% 4 15% 26% 8%	2543
September	1st to 10th	Day	46% 4 14% 25% 10% 1	2160
	11th to 20th	Day	45% 4 16% 28% 7%	2036
	21st to end	Day	53% 5% 13% 24% 5%	1958
October	1st to 10th	Day	53% 3 12% 21% 10%	1800
	11th to 20th	Day	64% 3 12% 15% 5%	1800
	21st to end	Day	68% 3 11% 13% 5%	1918
November	1st to 10th	Day	58% 3 15% 18% 7%	1513
	11th to 20th	Day	63% 4 13% 15% 5%	1520
	21st to end	Day	73% 3 10% 9% 4	1520
December	1st to 10th	Day	69% 4 10% 13% 4	1520
	11th to 20th	Day	65% 2 10% 19% 4 1	1714
	21st to end	Day	77% 1 8% 12% 2	2431
January	1st to 10th	Night	71% 3 9% 12% 5%	2838
	11th to 20th	Night	68% 3 9% 12% 7% 1	2683
	21st to end	Night	62% 4 7% 16% 10% 1	2574
February	1st to 10th	Night	63% 3 10% 15% 6% 1	2340
	11th to 20th	Night	63% 3 10% 16% 7% 1	2275
	21st to end	Night	63% 3 8% 17% 8% 1	1896
March	1st to 10th	Night	54% 4 10% 17% 13% 2	2017
	11th to 20th	Night	55% 3 10% 18% 11% 2	1980
	21st to end	Night	49% 4 9% 20% 15% 4	2178
April	1st to 10th	Night	56% 2 8% 19% 12% 2	1838
	11th to 20th	Night	51% 2 7% 23% 15% 2	1630
	21st to end	Night	53% 3 10% 15% 16% 3	1620
May	1st to 10th	Night	48% 3 8% 23% 14% 3	1566
	11th to 20th	Night	45% 5% 8% 23% 15% 3	1416
	21st to end	Night	42% 3 14% 22% 17% 3	1541
June	1st to 10th	Night	45% 4 12% 24% 11% 3	1260
	11th to 20th	Night	39% 5% 12% 25% 17% 2	1260
	21st to end	Night	44% 5% 16% 19% 14% 1	1260
July	1st to 10th	Night	32% 7% 14% 28% 16% 2	1225
	11th to 20th	Night	37% 5% 14% 29% 14% 1	1218
	21st to end	Night	37% 5% 18% 30% 10%	1515
August	1st to 10th	Night	43% 5% 18% 24% 11% 1	1600
	11th to 20th	Night	38% 7% 16% 28% 10% 1	1598
	21st to end	Night	44% 4 15% 25% 10% 1	1795
September	1st to 10th	Night	37% 5% 15% 29% 12% 2	1800
	11th to 20th	Night	39% 4 16% 32% 9%	1921
	21st to end	Night	43% 4 16% 29% 7%	2002
October	1st to 10th	Night	50% 4 13% 22% 11%	2160
	11th to 20th	Night	60% 3 11% 20% 5%	2160
	21st to end	Night	64% 3 12% 13% 7% 1	2436
November	1st to 10th	Night	52% 4 15% 22% 7%	2564
	11th to 20th	Night	62% 3 12% 16% 6% 1	2660
	21st to end	Night	68% 4 12% 12% 4	2660
December	1st to 10th	Night	70% 4 9% 14% 4	2660
	11th to 20th	Night	66% 3 9% 16% 6%	3477
	21st to end	Night	77% 2 6% 11% 4	5236

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	31% 15% 34% 13% 6% 1	180
	11th to 20th	Day	21% 13% 38% 17% 10% 1	182
	21st to end	Day	25% 11% 36% 18% 9% 1	264
February	1st to 10th	Day	31% 26% 31% 8% 3	240
	11th to 20th	Day	27% 20% 38% 14% 1	240
	21st to end	Day	32% 21% 38% 8% 1	198
March	1st to 10th	Day	23% 19% 37% 16% 4	382
	11th to 20th	Day	22% 18% 37% 19% 4 1	420
	21st to end	Day	28% 20% 29% 18% 4 2	462
April	1st to 10th	Day	27% 16% 31% 18% 7% 1	420
	11th to 20th	Day	34% 17% 23% 17% 6% 3	412
	21st to end	Day	33% 18% 27% 14% 6% 2	420
May	1st to 10th	Day	26% 13% 29% 20% 10% 2	423
	11th to 20th	Day	24% 15% 30% 17% 10% 4	447
	21st to end	Day	21% 14% 34% 19% 10% 2	492
June	1st to 10th	Day	20% 15% 33% 25% 6% 1	630
	11th to 20th	Day	17% 18% 28% 27% 7% 3	630
	21st to end	Day	20% 12% 31% 25% 10% 2	630
July	1st to 10th	Day	11% 11% 33% 32% 11% 1	621
	11th to 20th	Day	16% 10% 29% 27% 15% 3	618
	21st to end	Day	15% 8% 30% 28% 14% 5%	520
August	1st to 10th	Day	20% 7% 25% 26% 15% 6%	446
	11th to 20th	Day	17% 5% 23% 27% 19% 9%	439
	21st to end	Day	20% 9% 30% 21% 14% 5%	495
September	1st to 10th	Day	20% 12% 27% 26% 12% 5%	450
	11th to 20th	Day	17% 9% 30% 29% 11% 5%	450
	21st to end	Day	28% 12% 25% 20% 12% 4	450
October	1st to 10th	Day	26% 15% 25% 20% 13% 2	450
	11th to 20th	Day	30% 18% 32% 14% 4 2	450
	21st to end	Day	34% 19% 29% 16% 2 1	433
November	1st to 10th	Day	34% 19% 31% 12% 2 1	193
	11th to 20th	Day	23% 21% 38% 13% 4 1	180
	21st to end	Day	36% 17% 30% 13% 3	180
December	1st to 10th	Day	28% 17% 32% 18% 4	180
	11th to 20th	Day	31% 19% 31% 14% 4 1	180
	21st to end	Day	33% 18% 34% 13% 2 1	198
January	1st to 10th	Night	26% 14% 33% 22% 5%	950
	11th to 20th	Night	30% 14% 28% 23% 5%	910
	21st to end	Night	22% 9% 30% 27% 10% 1	792
February	1st to 10th	Night	20% 16% 39% 21% 4	720
	11th to 20th	Night	22% 15% 37% 21% 5%	703
	21st to end	Night	23% 20% 32% 21% 3 1	592
March	1st to 10th	Night	22% 18% 32% 24% 3	720
	11th to 20th	Night	23% 16% 34% 21% 5% 1	720
	21st to end	Night	20% 15% 34% 25% 6% 1	792
April	1st to 10th	Night	28% 13% 31% 24% 4	720
	11th to 20th	Night	23% 18% 26% 23% 8% 1	566
	21st to end	Night	25% 13% 27% 26% 7% 1	540
May	1st to 10th	Night	18% 8% 31% 33% 9% 1	486
	11th to 20th	Night	20% 10% 32% 28% 10%	354
	21st to end	Night	17% 10% 34% 32% 6% 1	389
June	1st to 10th	Night	18% 6% 34% 34% 8%	360
	11th to 20th	Night	19% 8% 29% 34% 10%	360
	21st to end	Night	17% 7% 28% 31% 16% 1	360
July	1st to 10th	Night	8% 7% 33% 41% 11% 1	350
	11th to 20th	Night	13% 5% 28% 38% 17%	348
	21st to end	Night	11% 5% 26% 41% 16% 1	459
August	1st to 10th	Night	14% 5% 23% 38% 18% 1	537
	11th to 20th	Night	17% 2 22% 34% 22% 2	534
	21st to end	Night	20% 6% 25% 29% 17% 2	607
September	1st to 10th	Night	19% 6% 26% 29% 19% 1	720
	11th to 20th	Night	19% 10% 24% 28% 17% 2	720
	21st to end	Night	21% 7% 28% 26% 16% 2	720
October	1st to 10th	Night	24% 10% 29% 26% 10% 1	720
	11th to 20th	Night	35% 10% 26% 22% 7% 1	720
	21st to end	Night	35% 12% 27% 21% 5%	792
November	1st to 10th	Night	26% 12% 30% 24% 6% 1	740
	11th to 20th	Night	28% 14% 30% 21% 7% 1	760
	21st to end	Night	34% 12% 28% 20% 5% 1	760
December	1st to 10th	Night	31% 15% 31% 18% 5% 1	760
	11th to 20th	Night	31% 14% 31% 19% 5% 1	902
	21st to end	Night	31% 15% 29% 20% 5%	1045

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