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 2025-09-19.

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	17% 11% 4 8% 5% 4 4 3 5% 7% 31%	126630
	Night	16% 13% 4 9% 5% 4 4 3 5% 6% 30%	122494
Transparency	Day	53% 4 12% 21% 9% 1	130148
	Night	55% 4 11% 19% 9% 1	127064
Seeing	Day	23% 15% 31% 21% 8% 2	16311
	Night	24% 12% 30% 26% 9% 1	25292

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	13% 19% 9% 14% 6% 6% 5% 3 4 5% 17%	3158
	11th to 20th	Day	11% 18% 8% 17% 6% 6% 4 3 5% 6% 18%	3243
	21st to end	Day	14% 20% 8% 14% 6% 5% 4 3 4 4 19%	4464
February	1st to 10th	Day	11% 19% 5% 12% 8% 6% 6% 3 5% 5% 20%	1800
	11th to 20th	Day	12% 19% 6% 10% 8% 4 4 3 4 5% 25%	1753
	21st to end	Day	16% 17% 6% 10% 6% 6% 4 3 4 5% 22%	1515
March	1st to 10th	Day	21% 16% 4 8% 4 4 4 3 4 5% 27%	4842
	11th to 20th	Day	15% 13% 4 12% 6% 4 4 3 5% 7% 25%	4980
	21st to end	Day	15% 16% 6% 10% 5% 5% 3 3 3 4 30%	5465
April	1st to 10th	Day	20% 13% 4 7% 4 4 4 3 4 7% 28%	2357
	11th to 20th	Day	22% 12% 3 6% 4 4 4 3 4 6% 33%	2552
	21st to end	Day	23% 12% 2 7% 4 3 3 3 4 5% 35%	2600
May	1st to 10th	Day	21% 9% 3 8% 5% 4 4 3 4 5% 34%	6026
	11th to 20th	Day	14% 8% 3 7% 5% 4 4 4 5% 7% 40%	6318
	21st to end	Day	22% 9% 3 7% 4 4 3 3 4 6% 36%	6984
June	1st to 10th	Day	18% 8% 3 7% 5% 4 5% 4 6% 7% 32%	3000
	11th to 20th	Day	14% 7% 3 7% 6% 4 5% 4 6% 8% 38%	3000
	21st to end	Day	18% 8% 2 7% 5% 5% 5% 4 6% 8% 30%	3000
July	1st to 10th	Day	16% 7% 3 7% 5% 6% 5% 5% 7% 8% 32%	6819
	11th to 20th	Day	12% 5% 2 6% 4 4 5% 4 6% 9% 43%	6820
	21st to end	Day	11% 5% 2 5% 4 4 4 4 6% 9% 46%	6822
August	1st to 10th	Day	12% 6% 3 6% 5% 5% 6% 4 7% 9% 37%	4234
	11th to 20th	Day	18% 6% 2 5% 4 4 5% 4 6% 9% 37%	4174
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 4 6% 7% 41%	4614
September	1st to 10th	Day	16% 8% 3 7% 4 4 5% 4 5% 7% 38%	2400
	11th to 20th	Day	15% 6% 3 6% 4 4 5% 4 6% 7% 40%	2240
	21st to end	Day	24% 8% 2 6% 5% 4 4 2 5% 6% 34%	2066
October	1st to 10th	Day	19% 9% 3 7% 5% 4 4 3 5% 5% 35%	1900
	11th to 20th	Day	25% 14% 3 8% 6% 4 3 4 4 5% 25%	1900
	21st to end	Day	29% 14% 4 8% 5% 4 4 3 4 5% 20%	2024
November	1st to 10th	Day	20% 14% 4 7% 5% 4 4 4 5% 6% 27%	1594
	11th to 20th	Day	18% 16% 5% 10% 5% 6% 5% 3 4 6% 23%	1600
	21st to end	Day	26% 21% 5% 9% 4 4 4 3 3 5% 17%	1600
December	1st to 10th	Day	15% 21% 9% 14% 6% 5% 5% 3 5% 4 12%	2600
	11th to 20th	Day	18% 19% 5% 13% 5% 4 3 2 4 4 24%	2690
	21st to end	Day	23% 20% 8% 15% 6% 3 2 2 3 5% 13%	3476
January	1st to 10th	Night	13% 17% 6% 14% 9% 6% 5% 3 5% 5% 17%	6808
	11th to 20th	Night	12% 18% 6% 13% 7% 6% 5% 4 4 4 21%	6657
	21st to end	Night	11% 20% 8% 15% 6% 5% 4 3 5% 5% 19%	6490
February	1st to 10th	Night	11% 16% 6% 12% 7% 7% 5% 4 5% 5% 24%	2600
	11th to 20th	Night	12% 17% 6% 12% 7% 6% 4 4 4 5% 24%	2533
	21st to end	Night	15% 17% 5% 10% 6% 5% 4 4 4 6% 24%	2113
March	1st to 10th	Night	18% 15% 3 8% 5% 4 4 3 5% 6% 28%	4997
	11th to 20th	Night	15% 14% 5% 11% 5% 5% 5% 4 5% 7% 25%	4979
	21st to end	Night	18% 12% 5% 9% 6% 5% 4 3 4 5% 31%	5467
April	1st to 10th	Night	20% 13% 4 8% 5% 4 3 3 5% 6% 30%	2042
	11th to 20th	Night	20% 9% 3 7% 5% 4 4 2 4 6% 37%	1813
	21st to end	Night	21% 9% 3 7% 6% 4 3 4 5% 5% 33%	1800
May	1st to 10th	Night	17% 9% 2 7% 4 4 3 3 5% 6% 37%	3901
	11th to 20th	Night	12% 7% 3 6% 4 4 4 4 6% 8% 42%	3575
	21st to end	Night	17% 9% 3 7% 5% 4 4 3 4 6% 38%	3890
June	1st to 10th	Night	14% 8% 3 7% 5% 4 5% 4 5% 7% 37%	1400
	11th to 20th	Night	14% 6% 2 6% 4 4 4 4 4 9% 43%	1400
	21st to end	Night	14% 7% 3 6% 4 5% 5% 3 6% 8% 38%	1400
July	1st to 10th	Night	16% 8% 3 8% 4 4 4 4 5% 7% 38%	3160
	11th to 20th	Night	14% 6% 2 5% 4 4 4 3 5% 8% 45%	3160
	21st to end	Night	11% 6% 2 6% 3 3 4 3 5% 8% 49%	4013
August	1st to 10th	Night	12% 6% 2 7% 4 4 5% 4 5% 8% 42%	2915
	11th to 20th	Night	14% 7% 2 6% 3 4 4 3 5% 8% 43%	2875
	21st to end	Night	14% 5% 2 5% 3 3 3 3 4 6% 50%	3251
September	1st to 10th	Night	15% 6% 2 5% 4 3 4 4 5% 7% 47%	2000
	11th to 20th	Night	14% 6% 2 5% 3 3 3 2 5% 6% 50%	2114
	21st to end	Night	19% 6% 2 6% 3 4 3 4 6% 7% 41%	2114
October	1st to 10th	Night	19% 7% 3 7% 5% 4 4 3 5% 6% 36%	2280
	11th to 20th	Night	27% 10% 3 6% 5% 4 4 3 5% 6% 28%	2280
	21st to end	Night	26% 13% 4 8% 5% 4 4 3 5% 6% 23%	2572
November	1st to 10th	Night	21% 10% 3 8% 4 4 4 4 5% 6% 31%	2703
	11th to 20th	Night	19% 15% 4 9% 6% 5% 4 3 5% 5% 25%	2800
	21st to end	Night	23% 17% 4 9% 6% 5% 4 3 5% 5% 19%	2800
December	1st to 10th	Night	17% 21% 5% 11% 7% 5% 5% 4 5% 5% 15%	4580
	11th to 20th	Night	18% 18% 5% 12% 6% 5% 4 3 5% 5% 20%	5510
	21st to end	Night	21% 22% 6% 15% 5% 3 3 2 3 4 16%	7502

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% 3 11% 12% 4	3159
	11th to 20th	Day	70% 1 9% 10% 9%	3270
	21st to end	Day	69% 2 7% 13% 8%	4464
February	1st to 10th	Day	66% 4 9% 15% 6% 1	1800
	11th to 20th	Day	63% 3 10% 14% 9% 1	1762
	21st to end	Day	65% 3 6% 16% 9% 1	1515
March	1st to 10th	Day	61% 2 9% 12% 13% 2	4845
	11th to 20th	Day	60% 3 13% 16% 8% 1	4980
	21st to end	Day	59% 2 9% 18% 10% 2	5465
April	1st to 10th	Day	57% 3 10% 20% 9% 1	2357
	11th to 20th	Day	55% 2 6% 24% 12% 1	2552
	21st to end	Day	54% 3 8% 18% 14% 3	2600
May	1st to 10th	Day	52% 4 6% 21% 13% 4	6035
	11th to 20th	Day	44% 4 12% 24% 14% 2	6322
	21st to end	Day	50% 3 10% 20% 15% 1	6984
June	1st to 10th	Day	50% 4 11% 23% 12% 1	3000
	11th to 20th	Day	44% 4 11% 25% 14% 1	3000
	21st to end	Day	50% 6% 13% 20% 10% 1	3000
July	1st to 10th	Day	46% 8% 16% 25% 6%	6746
	11th to 20th	Day	36% 6% 19% 34% 5%	6739
	21st to end	Day	34% 5% 18% 33% 9%	6626
August	1st to 10th	Day	41% 6% 15% 32% 7%	4221
	11th to 20th	Day	44% 5% 16% 27% 8%	4213
	21st to end	Day	40% 5% 13% 32% 9% 1	4614
September	1st to 10th	Day	46% 4 15% 25% 9% 1	2400
	11th to 20th	Day	42% 4 16% 29% 9%	2240
	21st to end	Day	52% 4 12% 24% 7%	2066
October	1st to 10th	Day	47% 5% 12% 28% 8%	3160
	11th to 20th	Day	52% 5% 14% 21% 8%	3140
	21st to end	Day	66% 4 15% 11% 4	3313
November	1st to 10th	Day	58% 4 14% 18% 7%	1594
	11th to 20th	Day	63% 4 12% 15% 5%	1600
	21st to end	Day	73% 3 10% 10% 4	1600
December	1st to 10th	Day	75% 5% 10% 9% 2	2600
	11th to 20th	Day	66% 2 8% 19% 5%	2690
	21st to end	Day	76% 2 6% 11% 4	3476
January	1st to 10th	Night	70% 3 9% 13% 4	6808
	11th to 20th	Night	68% 2 11% 10% 8%	6705
	21st to end	Night	68% 3 6% 11% 11% 1	6490
February	1st to 10th	Night	62% 3 11% 16% 7% 1	2600
	11th to 20th	Night	64% 3 10% 16% 6% 1	2535
	21st to end	Night	63% 3 8% 17% 8% 1	2113
March	1st to 10th	Night	57% 3 8% 15% 13% 4	5007
	11th to 20th	Night	60% 4 12% 16% 7% 1	4980
	21st to end	Night	57% 2 7% 19% 12% 3	5467
April	1st to 10th	Night	56% 2 8% 20% 12% 2	2042
	11th to 20th	Night	50% 3 7% 23% 15% 2	1813
	21st to end	Night	53% 3 10% 16% 15% 3	1800
May	1st to 10th	Night	48% 3 6% 23% 17% 3	3908
	11th to 20th	Night	40% 4 13% 22% 17% 4	3576
	21st to end	Night	48% 3 10% 21% 14% 3	3891
June	1st to 10th	Night	46% 4 12% 24% 11% 3	1400
	11th to 20th	Night	39% 5% 12% 25% 18% 1	1400
	21st to end	Night	45% 5% 15% 20% 14% 1	1400
July	1st to 10th	Night	43% 7% 12% 27% 10% 1	3125
	11th to 20th	Night	37% 6% 14% 33% 10% 1	3118
	21st to end	Night	33% 5% 14% 33% 15%	3895
August	1st to 10th	Night	40% 5% 16% 28% 11% 1	2904
	11th to 20th	Night	40% 6% 16% 28% 8%	2902
	21st to end	Night	36% 5% 15% 32% 12% 1	3251
September	1st to 10th	Night	38% 5% 15% 30% 11% 2	2000
	11th to 20th	Night	36% 4 16% 33% 11%	2114
	21st to end	Night	43% 4 16% 28% 9%	2114
October	1st to 10th	Night	44% 5% 13% 28% 10%	3800
	11th to 20th	Night	49% 5% 13% 28% 5%	3779
	21st to end	Night	56% 6% 19% 13% 5%	4233
November	1st to 10th	Night	53% 4 15% 22% 7%	2703
	11th to 20th	Night	62% 3 12% 16% 6% 1	2800
	21st to end	Night	68% 4 12% 13% 4	2800
December	1st to 10th	Night	71% 6% 11% 11% 2	4580
	11th to 20th	Night	67% 3 8% 13% 9%	5509
	21st to end	Night	75% 3 6% 12% 5%	7502

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	29% 14% 37% 14% 6% 1	200
	11th to 20th	Day	20% 14% 39% 18% 9%	223
	21st to end	Day	25% 11% 36% 18% 8% 1	330
February	1st to 10th	Day	30% 26% 33% 9% 2	300
	11th to 20th	Day	24% 22% 40% 13% 1	300
	21st to end	Day	34% 19% 38% 8% 1	249
March	1st to 10th	Day	26% 19% 36% 16% 3	458
	11th to 20th	Day	23% 18% 36% 19% 3 1	500
	21st to end	Day	27% 21% 29% 18% 3 1	550
April	1st to 10th	Day	28% 17% 30% 17% 7% 1	500
	11th to 20th	Day	36% 17% 23% 16% 6% 3	492
	21st to end	Day	35% 18% 26% 14% 6% 2	500
May	1st to 10th	Day	26% 13% 31% 19% 9% 2	503
	11th to 20th	Day	22% 17% 32% 18% 9% 3	527
	21st to end	Day	23% 13% 31% 21% 10% 2	582
June	1st to 10th	Day	19% 16% 34% 25% 6% 1	730
	11th to 20th	Day	17% 18% 30% 26% 6% 3	730
	21st to end	Day	22% 13% 31% 24% 9% 1	730
July	1st to 10th	Day	12% 12% 33% 31% 11% 1	721
	11th to 20th	Day	16% 10% 31% 26% 14% 3	718
	21st to end	Day	15% 9% 30% 28% 13% 4	611
August	1st to 10th	Day	18% 8% 27% 27% 15% 6%	526
	11th to 20th	Day	17% 6% 24% 27% 18% 9%	519
	21st to end	Day	19% 9% 30% 22% 14% 5%	583
September	1st to 10th	Day	20% 12% 29% 25% 10% 4	530
	11th to 20th	Day	15% 8% 27% 29% 13% 7%	522
	21st to end	Day	28% 11% 24% 20% 13% 4	490
October	1st to 10th	Day	26% 16% 25% 20% 12% 2	490
	11th to 20th	Day	29% 19% 33% 14% 4 1	490
	21st to end	Day	34% 18% 29% 16% 2 1	473
November	1st to 10th	Day	34% 20% 31% 13% 2 1	214
	11th to 20th	Day	25% 21% 38% 13% 4 1	200
	21st to end	Day	35% 18% 31% 14% 3	200
December	1st to 10th	Day	28% 18% 33% 19% 4	200
	11th to 20th	Day	32% 19% 29% 16% 4 1	200
	21st to end	Day	34% 16% 33% 14% 2 1	220
January	1st to 10th	Night	25% 14% 34% 22% 5%	1000
	11th to 20th	Night	29% 14% 29% 23% 5%	1000
	21st to end	Night	22% 11% 30% 26% 10% 1	880
February	1st to 10th	Night	19% 17% 39% 22% 4	800
	11th to 20th	Night	21% 16% 37% 21% 4	783
	21st to end	Night	22% 19% 34% 22% 3	660
March	1st to 10th	Night	23% 18% 33% 24% 3	800
	11th to 20th	Night	23% 16% 35% 20% 5% 1	800
	21st to end	Night	20% 15% 34% 24% 5% 1	880
April	1st to 10th	Night	27% 14% 31% 24% 4	800
	11th to 20th	Night	24% 18% 27% 22% 8% 1	629
	21st to end	Night	26% 13% 28% 25% 7% 1	600
May	1st to 10th	Night	18% 10% 31% 32% 9% 1	539
	11th to 20th	Night	19% 10% 32% 29% 9% 1	394
	21st to end	Night	18% 11% 32% 32% 6%	433
June	1st to 10th	Night	18% 7% 33% 34% 8%	400
	11th to 20th	Night	18% 8% 30% 36% 9%	400
	21st to end	Night	17% 9% 28% 31% 15% 1	400
July	1st to 10th	Night	9% 7% 31% 42% 9% 1	390
	11th to 20th	Night	12% 4 29% 38% 16%	388
	21st to end	Night	11% 5% 27% 41% 16% 1	511
August	1st to 10th	Night	14% 5% 22% 39% 18% 1	597
	11th to 20th	Night	18% 3 22% 33% 22% 2	594
	21st to end	Night	20% 6% 25% 31% 17% 2	675
September	1st to 10th	Night	19% 7% 26% 29% 19% 1	800
	11th to 20th	Night	17% 9% 22% 28% 20% 3	793
	21st to end	Night	22% 7% 26% 28% 16% 2	760
October	1st to 10th	Night	24% 11% 29% 26% 9% 1	760
	11th to 20th	Night	34% 10% 26% 23% 7% 1	760
	21st to end	Night	34% 12% 28% 20% 5%	836
November	1st to 10th	Night	27% 12% 30% 24% 6% 1	780
	11th to 20th	Night	28% 14% 30% 21% 7% 1	800
	21st to end	Night	34% 12% 27% 20% 5% 1	800
December	1st to 10th	Night	31% 15% 30% 19% 5% 1	800
	11th to 20th	Night	30% 14% 32% 19% 5% 1	950
	21st to end	Night	31% 15% 28% 20% 5%	1100

Page generated at 2025-09-16 01:49:14. Version ac07

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