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 2024-11-05.

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% 6% 31%	101678
	Night	17% 13% 4 9% 5% 4 4 3 5% 6% 31%	97386
Transparency	Day	53% 4 12% 22% 9% 1	105216
	Night	55% 4 12% 20% 9% 1	101937
Seeing	Day	23% 14% 31% 21% 9% 2	15178
	Night	24% 12% 30% 26% 9% 1	24205

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	17% 21% 9% 11% 4 4 4 2 4 5% 19%	2208
	11th to 20th	Day	11% 17% 8% 17% 6% 6% 4 4 5% 6% 18%	2278
	21st to end	Day	18% 22% 8% 11% 5% 5% 4 3 3 4 16%	3122
February	1st to 10th	Day	10% 19% 5% 12% 8% 6% 5% 4 5% 5% 20%	1710
	11th to 20th	Day	12% 19% 6% 10% 7% 4 4 3 4 6% 25%	1663
	21st to end	Day	16% 17% 5% 10% 6% 6% 4 3 4 5% 23%	1441
March	1st to 10th	Day	20% 16% 4 8% 4 4 4 3 5% 6% 27%	3370
	11th to 20th	Day	11% 16% 5% 14% 6% 4 5% 3 4 6% 26%	3480
	21st to end	Day	12% 15% 5% 11% 5% 5% 3 3 3 5% 33%	3815
April	1st to 10th	Day	21% 13% 4 7% 4 4 4 3 4 7% 27%	2239
	11th to 20th	Day	22% 11% 3 7% 4 4 4 3 4 6% 33%	2423
	21st to end	Day	23% 12% 2 7% 4 3 3 3 4 5% 35%	2470
May	1st to 10th	Day	21% 9% 3 7% 5% 4 4 3 5% 6% 33%	4204
	11th to 20th	Day	15% 8% 3 8% 5% 4 4 4 5% 7% 37%	4398
	21st to end	Day	20% 7% 2 5% 4 3 3 3 5% 7% 41%	4858
June	1st to 10th	Day	18% 9% 3 7% 5% 4 5% 4 6% 7% 32%	2850
	11th to 20th	Day	14% 7% 2 7% 6% 4 5% 4 6% 7% 38%	2850
	21st to end	Day	18% 9% 2 7% 5% 5% 5% 4 6% 8% 30%	2850
July	1st to 10th	Day	16% 7% 3 7% 5% 6% 5% 4 7% 7% 32%	4760
	11th to 20th	Day	13% 6% 2 6% 4 5% 5% 4 6% 9% 39%	4760
	21st to end	Day	12% 5% 2 5% 4 4 4 4 6% 8% 46%	4738
August	1st to 10th	Day	12% 6% 3 6% 5% 5% 6% 4 7% 9% 37%	4104
	11th to 20th	Day	19% 6% 3 5% 4 4 5% 4 6% 9% 37%	4044
	21st to end	Day	12% 7% 2 6% 5% 5% 5% 4 6% 7% 42%	4473
September	1st to 10th	Day	16% 8% 3 7% 4 4 4 4 5% 7% 39%	2280
	11th to 20th	Day	16% 6% 3 6% 4 4 5% 4 6% 7% 40%	2149
	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%	1546
	11th to 20th	Day	18% 16% 4 10% 5% 6% 5% 3 3 7% 23%	1520
	21st to end	Day	27% 21% 5% 9% 4 4 3 3 3 4 17%	1520
December	1st to 10th	Day	17% 20% 8% 10% 5% 4 5% 3 5% 5% 17%	1520
	11th to 20th	Day	18% 19% 6% 10% 4 4 4 3 4 5% 24%	1714
	21st to end	Day	21% 22% 7% 16% 6% 3 3 2 3 3 15%	2431
January	1st to 10th	Night	16% 18% 6% 13% 8% 5% 4 3 5% 5% 16%	4748
	11th to 20th	Night	12% 16% 6% 13% 7% 6% 5% 4 4 5% 21%	4687
	21st to end	Night	14% 23% 8% 12% 7% 5% 4 3 4 4 17%	4532
February	1st to 10th	Night	12% 16% 6% 11% 7% 7% 4 4 5% 5% 23%	2470
	11th to 20th	Night	13% 17% 6% 12% 7% 6% 4 4 4 5% 24%	2403
	21st to end	Night	15% 17% 5% 10% 6% 5% 4 4 4 5% 24%	2011
March	1st to 10th	Night	17% 14% 3 8% 5% 4 4 3 5% 6% 31%	3469
	11th to 20th	Night	12% 16% 5% 11% 5% 4 4 3 4 6% 28%	3479
	21st to end	Night	14% 10% 5% 8% 6% 6% 4 3 4 5% 34%	3817
April	1st to 10th	Night	20% 13% 4 8% 5% 4 3 3 4 6% 30%	1940
	11th to 20th	Night	20% 9% 3 7% 5% 4 3 2 4 6% 37%	1721
	21st to end	Night	21% 10% 3 6% 5% 4 3 4 5% 5% 34%	1710
May	1st to 10th	Night	17% 9% 3 8% 5% 4 4 3 5% 6% 37%	2723
	11th to 20th	Night	14% 7% 3 7% 5% 4 5% 4 5% 8% 38%	2495
	21st to end	Night	15% 8% 2 7% 5% 4 3 3 5% 7% 41%	2715
June	1st to 10th	Night	15% 8% 3 7% 5% 4 5% 4 5% 7% 37%	1330
	11th to 20th	Night	14% 6% 2 6% 4 4 4 4 5% 9% 43%	1330
	21st to end	Night	14% 7% 3 6% 4 5% 5% 3 6% 9% 38%	1330
July	1st to 10th	Night	15% 7% 3 7% 4 4 4 3 5% 7% 41%	2210
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 6% 8% 41%	2210
	21st to end	Night	11% 6% 2 6% 4 3 4 4 5% 9% 48%	2796
August	1st to 10th	Night	12% 6% 2 7% 4 4 5% 4 5% 8% 42%	2825
	11th to 20th	Night	14% 7% 3 7% 3 4 4 3 5% 8% 43%	2785
	21st to end	Night	14% 5% 2 5% 3 3 3 3 4 6% 50%	3151
September	1st to 10th	Night	15% 6% 2 5% 3 3 3 3 5% 7% 48%	1900
	11th to 20th	Night	14% 6% 2 5% 3 3 3 2 5% 6% 50%	2028
	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% 32%	2631
	11th to 20th	Night	19% 15% 4 9% 6% 5% 4 3 5% 5% 25%	2660
	21st to end	Night	23% 17% 4 9% 6% 4 4 3 5% 5% 19%	2660
December	1st to 10th	Night	19% 20% 5% 10% 7% 5% 4 3 4 5% 19%	2660
	11th to 20th	Night	20% 17% 5% 9% 5% 4 4 4 5% 6% 21%	3478
	21st to end	Night	21% 21% 7% 16% 5% 3 3 2 3 4 14%	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% 2 14% 11% 2	2209
	11th to 20th	Day	70% 1 12% 12% 6% 1	2278
	21st to end	Day	74% 2 8% 12% 4	3122
February	1st to 10th	Day	65% 4 9% 15% 6% 1	1710
	11th to 20th	Day	62% 3 10% 15% 9% 1	1672
	21st to end	Day	65% 3 6% 16% 10% 1	1441
March	1st to 10th	Day	60% 2 12% 17% 9% 1	3373
	11th to 20th	Day	61% 2 11% 18% 7% 1	3480
	21st to end	Day	56% 2 9% 20% 11% 2	3815
April	1st to 10th	Day	57% 3 11% 19% 9% 1	2239
	11th to 20th	Day	55% 2 6% 24% 11% 1	2423
	21st to end	Day	54% 3 8% 18% 14% 3	2470
May	1st to 10th	Day	52% 4 8% 24% 12% 1	4216
	11th to 20th	Day	47% 3 13% 28% 9% 1	4402
	21st to end	Day	45% 3 13% 20% 19% 1	4858
June	1st to 10th	Day	51% 4 11% 23% 11% 1	2850
	11th to 20th	Day	45% 4 12% 24% 14% 1	2850
	21st to end	Day	50% 6% 13% 20% 10% 1	2850
July	1st to 10th	Day	47% 7% 15% 24% 7%	4686
	11th to 20th	Day	38% 6% 18% 31% 6%	4679
	21st to end	Day	37% 5% 15% 32% 11%	4587
August	1st to 10th	Day	41% 5% 15% 31% 7%	4091
	11th to 20th	Day	44% 5% 16% 27% 8%	4083
	21st to end	Day	40% 5% 13% 33% 9% 1	4473
September	1st to 10th	Day	46% 4 14% 25% 10% 1	2280
	11th to 20th	Day	43% 4 16% 28% 9% 1	2149
	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% 3 15% 18% 7%	1546
	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 12% 10% 4	4748
	11th to 20th	Night	68% 2 12% 14% 4	4687
	21st to end	Night	73% 3 7% 11% 6%	4532
February	1st to 10th	Night	63% 3 11% 16% 6% 1	2470
	11th to 20th	Night	64% 3 10% 16% 6% 1	2405
	21st to end	Night	63% 3 8% 17% 9% 1	2011
March	1st to 10th	Night	55% 3 10% 18% 13% 1	3479
	11th to 20th	Night	58% 2 12% 17% 8% 2	3480
	21st to end	Night	53% 3 9% 21% 12% 3	3817
April	1st to 10th	Night	56% 2 8% 19% 12% 2	1940
	11th to 20th	Night	51% 2 7% 23% 15% 2	1721
	21st to end	Night	53% 3 10% 16% 16% 3	1710
May	1st to 10th	Night	50% 3 8% 24% 14% 2	2730
	11th to 20th	Night	44% 4 11% 27% 13% 2	2496
	21st to end	Night	45% 2 11% 23% 15% 4	2716
June	1st to 10th	Night	46% 4 11% 24% 11% 3	1330
	11th to 20th	Night	39% 5% 12% 25% 18% 1	1330
	21st to end	Night	45% 5% 15% 20% 14% 1	1330
July	1st to 10th	Night	41% 6% 14% 25% 13% 2	2175
	11th to 20th	Night	40% 6% 15% 30% 8% 1	2168
	21st to end	Night	34% 5% 14% 29% 18%	2707
August	1st to 10th	Night	40% 5% 15% 28% 11% 1	2814
	11th to 20th	Night	40% 6% 16% 29% 8%	2812
	21st to end	Night	36% 5% 15% 31% 13% 1	3151
September	1st to 10th	Night	37% 5% 15% 30% 12% 2	1900
	11th to 20th	Night	37% 4 16% 32% 11%	2028
	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% 3 15% 22% 7%	2631
	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% 14% 39% 18% 9% 1	200
	21st to end	Day	26% 10% 36% 19% 8% 1	297
February	1st to 10th	Day	30% 25% 33% 9% 3	270
	11th to 20th	Day	24% 20% 39% 15% 1	270
	21st to end	Day	34% 20% 38% 8%	225
March	1st to 10th	Day	24% 19% 38% 16% 4	420
	11th to 20th	Day	22% 18% 37% 20% 3 1	460
	21st to end	Day	26% 21% 30% 17% 4 1	506
April	1st to 10th	Day	27% 17% 30% 18% 7% 1	460
	11th to 20th	Day	36% 17% 23% 16% 5% 3	452
	21st to end	Day	34% 19% 26% 13% 7% 2	460
May	1st to 10th	Day	25% 13% 30% 20% 10% 2	463
	11th to 20th	Day	22% 16% 31% 18% 9% 3	487
	21st to end	Day	21% 14% 33% 20% 10% 2	537
June	1st to 10th	Day	19% 15% 33% 25% 6% 1	680
	11th to 20th	Day	17% 17% 30% 26% 7% 3	680
	21st to end	Day	21% 13% 31% 25% 9% 1	680
July	1st to 10th	Day	12% 11% 33% 31% 11% 1	671
	11th to 20th	Day	16% 9% 30% 27% 15% 3	668
	21st to end	Day	15% 8% 29% 29% 14% 5%	565
August	1st to 10th	Day	19% 7% 27% 26% 15% 6%	486
	11th to 20th	Day	18% 5% 23% 26% 19% 9%	479
	21st to end	Day	20% 9% 29% 22% 15% 5%	539
September	1st to 10th	Day	20% 11% 28% 25% 11% 4	490
	11th to 20th	Day	16% 8% 28% 29% 13% 6%	490
	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% 19% 32% 12% 2 1	202
	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	29% 14% 29% 23% 5%	950
	21st to end	Night	22% 10% 30% 26% 10% 1	836
February	1st to 10th	Night	19% 16% 38% 22% 4	760
	11th to 20th	Night	22% 15% 38% 21% 5%	743
	21st to end	Night	23% 19% 33% 21% 3	628
March	1st to 10th	Night	22% 18% 33% 24% 3	760
	11th to 20th	Night	23% 16% 34% 21% 5% 1	760
	21st to end	Night	20% 15% 35% 24% 5% 1	836
April	1st to 10th	Night	27% 13% 31% 24% 4	760
	11th to 20th	Night	24% 18% 27% 23% 8% 1	597
	21st to end	Night	25% 13% 27% 25% 8% 1	570
May	1st to 10th	Night	18% 9% 30% 33% 9% 1	512
	11th to 20th	Night	19% 11% 31% 29% 10% 1	374
	21st to end	Night	17% 11% 33% 32% 6%	411
June	1st to 10th	Night	18% 6% 33% 34% 8%	380
	11th to 20th	Night	18% 8% 29% 35% 9%	380
	21st to end	Night	17% 8% 27% 31% 15% 1	380
July	1st to 10th	Night	9% 7% 31% 42% 10% 1	370
	11th to 20th	Night	13% 4 28% 38% 17%	368
	21st to end	Night	11% 5% 26% 40% 17% 1	485
August	1st to 10th	Night	14% 6% 23% 38% 17% 1	567
	11th to 20th	Night	17% 3 22% 33% 22% 2	564
	21st to end	Night	20% 5% 24% 31% 17% 2	641
September	1st to 10th	Night	19% 6% 25% 29% 19% 1	760
	11th to 20th	Night	18% 10% 23% 28% 19% 3	760
	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	26% 12% 30% 25% 6% 1	760
	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

Page generated at 2024-11-03 02:11:21. Version ac07

Copyright © 2024 Attilla Danko.