Cricket Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cricket Hill 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	13% 8% 3 7% 5% 5% 5% 4 5% 7% 38%	101294
	Night	15% 10% 4 7% 5% 4 4 4 5% 6% 36%	97826
Transparency	Day	42% 8% 13% 22% 13% 2	104864
	Night	46% 7% 12% 21% 13% 2	102384
Seeing	Day	14% 6% 23% 33% 19% 4	15809
	Night	18% 8% 27% 30% 15% 2	25646

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	14% 13% 8% 9% 6% 6% 5% 4 5% 6% 25%	2527
	11th to 20th	Day	13% 14% 7% 14% 5% 5% 8% 10% 6% 4 15%	2530
	21st to end	Day	20% 21% 6% 9% 5% 4 4 3 3 5% 21%	2815
February	1st to 10th	Day	14% 13% 4 9% 6% 5% 5% 4 6% 6% 26%	1775
	11th to 20th	Day	14% 11% 4 7% 6% 5% 4 4 6% 6% 34%	1848
	21st to end	Day	13% 12% 5% 11% 5% 5% 5% 4 6% 5% 31%	1570
March	1st to 10th	Day	15% 12% 3 8% 4 4 4 3 4 5% 37%	3120
	11th to 20th	Day	9% 6% 3 6% 4 5% 5% 5% 7% 8% 41%	3259
	21st to end	Day	19% 11% 5% 11% 6% 5% 5% 4 5% 6% 23%	4165
April	1st to 10th	Day	17% 10% 3 7% 5% 5% 3 4 5% 7% 33%	2280
	11th to 20th	Day	15% 7% 3 6% 5% 6% 5% 4 6% 7% 36%	2254
	21st to end	Day	18% 8% 3 7% 5% 5% 5% 4 5% 8% 34%	2408
May	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 4 5% 8% 36%	4082
	11th to 20th	Day	15% 5% 3 6% 4 4 4 3 5% 8% 43%	4255
	21st to end	Day	10% 6% 2 6% 5% 4 4 4 5% 8% 46%	4824
June	1st to 10th	Day	10% 6% 2 5% 4 5% 5% 4 6% 8% 46%	2660
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 4 7% 9% 45%	2660
	21st to end	Day	10% 5% 2 6% 5% 5% 5% 5% 6% 9% 40%	2660
July	1st to 10th	Day	11% 7% 3 7% 5% 5% 5% 5% 6% 9% 38%	4440
	11th to 20th	Day	7% 4 1 4 4 4 4 4 6% 9% 53%	4440
	21st to end	Day	8% 5% 2 7% 4 5% 5% 4 7% 9% 45%	4813
August	1st to 10th	Day	11% 4 2 5% 4 4 4 4 6% 8% 47%	4295
	11th to 20th	Day	10% 4 1 5% 4 3 4 4 6% 8% 51%	3801
	21st to end	Day	7% 4 2 6% 4 4 4 3 6% 8% 51%	4180
September	1st to 10th	Day	12% 5% 2 5% 4 4 4 3 6% 8% 48%	2280
	11th to 20th	Day	11% 4 2 3 3 4 4 3 5% 8% 52%	2139
	21st to end	Day	12% 6% 2 6% 5% 4 5% 4 6% 8% 41%	2090
October	1st to 10th	Day	14% 7% 3 6% 4 4 4 3 5% 5% 46%	2070
	11th to 20th	Day	19% 7% 3 8% 5% 4 4 5% 4 6% 36%	1862
	21st to end	Day	19% 10% 2 6% 4 6% 5% 3 5% 6% 33%	1881
November	1st to 10th	Day	13% 9% 3 6% 4 4 4 3 5% 7% 43%	1708
	11th to 20th	Day	15% 11% 3 10% 6% 6% 4 4 5% 6% 31%	1710
	21st to end	Day	18% 11% 3 8% 5% 6% 4 3 3 5% 34%	1672
December	1st to 10th	Day	16% 14% 7% 10% 7% 5% 4 4 4 7% 23%	1520
	11th to 20th	Day	13% 12% 6% 11% 5% 6% 5% 4 6% 7% 26%	1918
	21st to end	Day	20% 20% 6% 12% 6% 5% 4 3 4 4 15%	2783
January	1st to 10th	Night	16% 17% 8% 9% 5% 4 4 4 5% 5% 24%	4428
	11th to 20th	Night	18% 17% 6% 14% 5% 4 5% 7% 5% 4 15%	4440
	21st to end	Night	23% 18% 7% 9% 4 4 4 3 4 5% 21%	4852
February	1st to 10th	Night	16% 13% 5% 8% 5% 4 4 3 5% 6% 30%	2404
	11th to 20th	Night	14% 11% 3 8% 5% 5% 5% 4 5% 6% 35%	2218
	21st to end	Night	19% 12% 3 8% 4 4 4 2 4 5% 34%	1884
March	1st to 10th	Night	19% 11% 3 7% 4 3 4 3 4 5% 38%	3733
	11th to 20th	Night	9% 7% 2 6% 4 4 4 4 4 7% 48%	3716
	21st to end	Night	20% 12% 7% 8% 5% 4 4 3 4 5% 27%	3480
April	1st to 10th	Night	17% 8% 3 6% 5% 4 5% 4 4 7% 38%	1900
	11th to 20th	Night	19% 8% 3 5% 4 5% 4 3 5% 5% 38%	1875
	21st to end	Night	18% 8% 3 6% 5% 4 4 3 5% 6% 37%	1771
May	1st to 10th	Night	16% 7% 3 8% 6% 4 5% 4 6% 7% 34%	2813
	11th to 20th	Night	18% 7% 2 5% 4 4 5% 5% 6% 8% 37%	2643
	21st to end	Night	13% 6% 2 6% 6% 4 4 3 5% 6% 45%	2743
June	1st to 10th	Night	9% 6% 2 4 5% 5% 4 3 6% 8% 47%	1520
	11th to 20th	Night	10% 7% 2 4 4 3 5% 5% 6% 9% 45%	1520
	21st to end	Night	10% 6% 3 7% 5% 4 5% 4 7% 8% 41%	1520
July	1st to 10th	Night	12% 4 2 6% 6% 5% 5% 5% 6% 9% 40%	2530
	11th to 20th	Night	7% 3 2 5% 4 4 4 4 6% 8% 53%	2530
	21st to end	Night	6% 4 1 6% 5% 5% 6% 5% 8% 8% 46%	2750
August	1st to 10th	Night	9% 4 2 6% 5% 5% 5% 4 6% 8% 48%	2638
	11th to 20th	Night	9% 4 2 5% 4 4 4 4 6% 7% 52%	3025
	21st to end	Night	9% 5% 2 5% 4 4 4 3 5% 7% 52%	3476
September	1st to 10th	Night	12% 5% 2 5% 4 3 4 3 5% 7% 50%	1900
	11th to 20th	Night	11% 4 2 5% 3 3 4 3 5% 8% 53%	2021
	21st to end	Night	13% 5% 2 7% 4 4 4 3 5% 8% 44%	2090
October	1st to 10th	Night	14% 5% 1 6% 4 4 3 3 5% 6% 48%	2107
	11th to 20th	Night	18% 8% 2 7% 4 4 4 3 4 6% 41%	2316
	21st to end	Night	22% 8% 3 7% 4 3 3 3 5% 8% 35%	2717
November	1st to 10th	Night	13% 8% 3 6% 4 4 4 3 4 6% 44%	2470
	11th to 20th	Night	15% 11% 4 8% 5% 5% 4 4 5% 7% 33%	2470
	21st to end	Night	18% 11% 3 7% 5% 5% 4 4 5% 5% 34%	2503
December	1st to 10th	Night	18% 13% 4 9% 7% 6% 5% 4 5% 6% 24%	2660
	11th to 20th	Night	14% 16% 5% 9% 5% 4 5% 3 5% 6% 28%	3279
	21st to end	Night	24% 18% 6% 9% 6% 4 4 3 4 5% 17%	4884

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	59% 9% 15% 12% 5%	2528
	11th to 20th	Day	65% 8% 13% 10% 3	2530
	21st to end	Day	66% 5% 9% 16% 4	2815
February	1st to 10th	Day	56% 8% 13% 14% 9% 1	1775
	11th to 20th	Day	50% 8% 10% 22% 9% 1	1858
	21st to end	Day	53% 9% 12% 16% 9% 2	1570
March	1st to 10th	Day	48% 8% 12% 20% 10% 2	3120
	11th to 20th	Day	37% 11% 13% 30% 9% 1	3259
	21st to end	Day	59% 12% 13% 12% 4	4165
April	1st to 10th	Day	49% 7% 13% 20% 11%	2280
	11th to 20th	Day	46% 8% 10% 20% 12% 4	2254
	21st to end	Day	47% 8% 13% 17% 12% 2	2408
May	1st to 10th	Day	42% 10% 13% 22% 11% 1	4120
	11th to 20th	Day	37% 9% 14% 27% 13% 1	4259
	21st to end	Day	34% 9% 12% 21% 20% 4	4837
June	1st to 10th	Day	35% 8% 13% 23% 18% 2	2660
	11th to 20th	Day	33% 8% 12% 24% 20% 3	2660
	21st to end	Day	37% 11% 15% 20% 14% 2	2660
July	1st to 10th	Day	42% 7% 13% 22% 13% 3	4371
	11th to 20th	Day	26% 8% 17% 31% 17% 1	4365
	21st to end	Day	34% 9% 18% 17% 20% 2	4662
August	1st to 10th	Day	34% 7% 17% 28% 13% 1	4280
	11th to 20th	Day	29% 9% 11% 34% 16% 1	3839
	21st to end	Day	30% 7% 15% 26% 20% 2	4179
September	1st to 10th	Day	34% 8% 14% 23% 18% 3	2280
	11th to 20th	Day	29% 7% 13% 29% 20% 2	2139
	21st to end	Day	39% 8% 12% 24% 17% 1	2090
October	1st to 10th	Day	27% 5% 7% 37% 23% 1	3434
	11th to 20th	Day	37% 6% 11% 26% 20%	3078
	21st to end	Day	45% 5% 10% 26% 11% 3	3081
November	1st to 10th	Day	41% 6% 15% 22% 15% 2	1708
	11th to 20th	Day	51% 7% 14% 18% 8% 1	1710
	21st to end	Day	54% 7% 11% 21% 8%	1672
December	1st to 10th	Day	58% 11% 13% 13% 6%	1520
	11th to 20th	Day	55% 8% 14% 19% 4	1915
	21st to end	Day	72% 8% 9% 8% 2	2783
January	1st to 10th	Night	60% 8% 13% 14% 4	4428
	11th to 20th	Night	69% 7% 12% 9% 3	4440
	21st to end	Night	67% 6% 11% 13% 4	4852
February	1st to 10th	Night	55% 5% 12% 16% 10% 1	2404
	11th to 20th	Night	48% 6% 13% 21% 11% 1	2219
	21st to end	Night	53% 5% 12% 18% 10% 3	1884
March	1st to 10th	Night	48% 6% 12% 23% 9% 2	3733
	11th to 20th	Night	35% 7% 12% 26% 17% 2	3716
	21st to end	Night	59% 7% 9% 19% 6% 1	3480
April	1st to 10th	Night	45% 7% 12% 22% 13% 1	1900
	11th to 20th	Night	46% 7% 8% 19% 17% 3	1875
	21st to end	Night	47% 7% 10% 21% 13% 2	1771
May	1st to 10th	Night	46% 8% 10% 20% 13% 2	2840
	11th to 20th	Night	41% 8% 14% 25% 10% 1	2644
	21st to end	Night	39% 7% 10% 17% 21% 5%	2751
June	1st to 10th	Night	33% 7% 13% 25% 19% 3	1520
	11th to 20th	Night	34% 6% 13% 25% 21% 2	1520
	21st to end	Night	37% 9% 16% 20% 16% 2	1520
July	1st to 10th	Night	40% 7% 16% 20% 11% 6%	2490
	11th to 20th	Night	27% 8% 15% 28% 20% 2	2482
	21st to end	Night	31% 9% 17% 18% 22% 4	2662
August	1st to 10th	Night	33% 7% 15% 27% 17% 1	2629
	11th to 20th	Night	30% 7% 14% 28% 21% 1	3053
	21st to end	Night	31% 6% 12% 31% 18% 3	3476
September	1st to 10th	Night	32% 7% 13% 25% 21% 3	1900
	11th to 20th	Night	30% 5% 9% 28% 26% 2	2021
	21st to end	Night	38% 6% 11% 27% 16% 2	2090
October	1st to 10th	Night	23% 4 8% 38% 25% 2	3510
	11th to 20th	Night	38% 5% 9% 22% 24% 2	3839
	21st to end	Night	42% 5% 10% 25% 17% 2	4467
November	1st to 10th	Night	40% 6% 11% 24% 15% 3	2470
	11th to 20th	Night	49% 7% 13% 20% 9% 1	2470
	21st to end	Night	51% 7% 13% 21% 8%	2503
December	1st to 10th	Night	56% 11% 12% 13% 6% 1	2660
	11th to 20th	Night	55% 7% 15% 17% 5%	3281
	21st to end	Night	69% 7% 10% 10% 3	4884

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	21% 10% 33% 29% 7% 1	270
	11th to 20th	Day	22% 11% 34% 27% 5%	270
	21st to end	Day	22% 11% 31% 30% 6%	297
February	1st to 10th	Day	19% 10% 38% 26% 7% 1	270
	11th to 20th	Day	17% 15% 36% 27% 4	270
	21st to end	Day	15% 9% 43% 27% 6%	225
March	1st to 10th	Day	15% 12% 35% 34% 4	270
	11th to 20th	Day	17% 11% 35% 30% 7%	314
	21st to end	Day	23% 10% 32% 25% 9% 1	506
April	1st to 10th	Day	20% 10% 32% 30% 8%	460
	11th to 20th	Day	15% 10% 33% 28% 12% 3	452
	21st to end	Day	20% 7% 30% 29% 13% 2	460
May	1st to 10th	Day	20% 5% 29% 33% 11% 2	463
	11th to 20th	Day	18% 3 23% 37% 17% 2	583
	21st to end	Day	13% 3 19% 35% 24% 6%	734
June	1st to 10th	Day	10% 3 20% 38% 25% 4	680
	11th to 20th	Day	11% 1 19% 39% 26% 4	680
	21st to end	Day	10% 4 18% 41% 23% 4	680
July	1st to 10th	Day	7% 3 12% 36% 29% 13%	671
	11th to 20th	Day	10% 2 12% 40% 28% 8%	668
	21st to end	Day	7% 1 14% 41% 32% 5%	739
August	1st to 10th	Day	8% 2 10% 37% 35% 9%	600
	11th to 20th	Day	9% 5% 11% 37% 30% 8%	479
	21st to end	Day	7% 3 11% 34% 36% 10%	539
September	1st to 10th	Day	13% 3 17% 30% 30% 7%	490
	11th to 20th	Day	9% 3 11% 32% 31% 13%	490
	21st to end	Day	15% 6% 22% 26% 24% 8%	490
October	1st to 10th	Day	17% 3 23% 31% 20% 6%	470
	11th to 20th	Day	17% 15% 26% 25% 13% 2	300
	21st to end	Day	25% 12% 26% 31% 6% 1	330
November	1st to 10th	Day	14% 10% 27% 33% 16% 1	282
	11th to 20th	Day	20% 15% 33% 22% 9% 1	270
	21st to end	Day	27% 8% 31% 30% 4	270
December	1st to 10th	Day	15% 16% 37% 27% 5%	270
	11th to 20th	Day	15% 14% 41% 23% 7%	270
	21st to end	Day	20% 16% 40% 21% 2	297
January	1st to 10th	Night	19% 14% 39% 23% 5%	950
	11th to 20th	Night	22% 16% 33% 24% 5% 1	950
	21st to end	Night	21% 12% 35% 27% 5%	1045
February	1st to 10th	Night	22% 8% 38% 25% 7%	884
	11th to 20th	Night	19% 11% 36% 29% 5%	743
	21st to end	Night	24% 10% 38% 24% 4	628
March	1st to 10th	Night	21% 8% 35% 27% 9%	760
	11th to 20th	Night	15% 8% 31% 36% 9% 1	760
	21st to end	Night	23% 7% 29% 29% 11% 1	641
April	1st to 10th	Night	19% 9% 31% 32% 8% 1	570
	11th to 20th	Night	21% 7% 26% 29% 14% 1	563
	21st to end	Night	20% 7% 26% 32% 14% 1	570
May	1st to 10th	Night	18% 4 23% 39% 14% 1	570
	11th to 20th	Night	19% 2 18% 35% 24% 1	561
	21st to end	Night	14% 2 14% 38% 28% 4	617
June	1st to 10th	Night	11% 2 14% 42% 29% 2	570
	11th to 20th	Night	12% 3 16% 41% 25% 3	570
	21st to end	Night	10% 2 18% 38% 29% 3	570
July	1st to 10th	Night	9% 2 7% 38% 34% 9%	555
	11th to 20th	Night	9% 3 10% 38% 33% 7%	552
	21st to end	Night	6% 1 12% 43% 34% 4	624
August	1st to 10th	Night	7% 1 9% 41% 33% 8%	567
	11th to 20th	Night	8% 3 10% 38% 33% 9%	564
	21st to end	Night	9% 2 14% 32% 37% 6%	627
September	1st to 10th	Night	12% 3 16% 32% 31% 6%	570
	11th to 20th	Night	12% 4 12% 33% 30% 9%	691
	21st to end	Night	14% 7% 20% 29% 23% 7%	760
October	1st to 10th	Night	15% 5% 19% 36% 21% 4	760
	11th to 20th	Night	21% 11% 29% 26% 11% 1	760
	21st to end	Night	26% 11% 29% 25% 10%	836
November	1st to 10th	Night	18% 9% 36% 23% 13% 1	760
	11th to 20th	Night	19% 17% 32% 26% 5% 1	760
	21st to end	Night	21% 13% 35% 25% 6%	793
December	1st to 10th	Night	23% 15% 37% 21% 5%	950
	11th to 20th	Night	21% 13% 37% 25% 4	950
	21st to end	Night	29% 14% 35% 19% 2	1045

Page generated at 2024-11-03 01:11:27. Version ac07

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