Mosquito Hill Nature Center
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mosquito Hill Nature Center clear sky chart from 2005-11-06 to 2024-11-10.

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 6% 7% 38%	101528
	Night	13% 10% 3 8% 5% 4 4 3 5% 6% 38%	97712
Transparency	Day	43% 6% 12% 25% 13% 1	105036
	Night	45% 6% 11% 23% 13% 1	102332
Seeing	Day	16% 10% 29% 26% 15% 5%	15990
	Night	17% 8% 31% 31% 12% 1	25850

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	12% 12% 4 12% 6% 6% 5% 3 4 5% 30%	2527
	11th to 20th	Day	11% 12% 4 12% 7% 7% 8% 6% 6% 7% 22%	2530
	21st to end	Day	15% 16% 6% 13% 6% 5% 4 3 5% 5% 21%	2783
February	1st to 10th	Day	9% 12% 4 11% 5% 4 6% 4 7% 6% 32%	1705
	11th to 20th	Day	10% 11% 4 8% 6% 4 5% 3 6% 6% 37%	1787
	21st to end	Day	12% 11% 4 9% 6% 4 4 4 5% 7% 34%	1570
March	1st to 10th	Day	13% 8% 2 5% 4 3 3 3 5% 7% 47%	3120
	11th to 20th	Day	9% 8% 4 8% 5% 4 4 4 6% 8% 42%	3281
	21st to end	Day	21% 12% 4 10% 4 4 4 3 4 5% 29%	4164
April	1st to 10th	Day	16% 12% 3 8% 5% 5% 5% 4 4 6% 31%	2280
	11th to 20th	Day	20% 9% 3 6% 5% 6% 4 4 5% 5% 34%	2254
	21st to end	Day	19% 9% 3 8% 6% 5% 4 4 6% 5% 33%	2409
May	1st to 10th	Day	14% 7% 3 6% 5% 4 5% 4 6% 7% 40%	4235
	11th to 20th	Day	13% 6% 2 6% 3 4 4 3 5% 8% 45%	4399
	21st to end	Day	13% 7% 3 7% 5% 4 5% 4 6% 7% 39%	4824
June	1st to 10th	Day	11% 5% 2 6% 5% 4 4 4 6% 8% 43%	2660
	11th to 20th	Day	13% 7% 3 6% 4 4 5% 4 7% 9% 39%	2660
	21st to end	Day	10% 6% 2 7% 4 5% 5% 4 6% 9% 41%	2660
July	1st to 10th	Day	13% 5% 2 6% 5% 5% 6% 5% 7% 10% 36%	4440
	11th to 20th	Day	5% 3 1 4 3 4 5% 5% 8% 11% 50%	4440
	21st to end	Day	8% 6% 2 6% 5% 5% 4 4 6% 7% 46%	4813
August	1st to 10th	Day	9% 6% 3 6% 4 5% 6% 4 7% 8% 42%	4423
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 6% 9% 45%	3915
	21st to end	Day	10% 6% 3 7% 5% 4 5% 4 6% 8% 41%	4180
September	1st to 10th	Day	12% 6% 3 6% 4 4 4 4 6% 8% 44%	2280
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 5% 9% 47%	2195
	21st to end	Day	12% 8% 2 7% 4 5% 4 4 6% 7% 41%	2090
October	1st to 10th	Day	14% 8% 3 6% 3 4 4 4 5% 6% 45%	1971
	11th to 20th	Day	19% 9% 3 7% 5% 4 4 3 6% 7% 32%	1876
	21st to end	Day	17% 10% 3 8% 5% 4 3 3 4 6% 36%	1881
November	1st to 10th	Day	14% 7% 2 7% 4 4 5% 4 4 7% 42%	1753
	11th to 20th	Day	12% 12% 4 11% 6% 5% 5% 3 6% 6% 31%	1682
	21st to end	Day	15% 11% 4 7% 6% 4 4 4 5% 6% 35%	1520
December	1st to 10th	Day	13% 12% 4 9% 7% 6% 5% 4 6% 6% 29%	1520
	11th to 20th	Day	14% 13% 5% 10% 6% 6% 5% 3 4 7% 27%	1918
	21st to end	Day	19% 18% 6% 13% 6% 5% 4 3 3 4 18%	2783
January	1st to 10th	Night	13% 14% 7% 10% 5% 4 3 2 3 4 33%	4428
	11th to 20th	Night	12% 13% 4 13% 7% 6% 7% 5% 7% 5% 21%	4440
	21st to end	Night	14% 19% 6% 11% 6% 4 4 3 4 5% 24%	4884
February	1st to 10th	Night	9% 13% 5% 11% 5% 4 4 4 5% 5% 35%	2470
	11th to 20th	Night	10% 9% 4 8% 6% 5% 5% 4 5% 5% 38%	2278
	21st to end	Night	15% 12% 4 8% 5% 4 3 4 4 6% 36%	1884
March	1st to 10th	Night	14% 8% 3 6% 3 3 4 3 5% 7% 44%	3733
	11th to 20th	Night	9% 9% 3 8% 6% 5% 4 3 5% 6% 40%	3709
	21st to end	Night	20% 10% 3 10% 5% 5% 4 3 5% 5% 30%	3466
April	1st to 10th	Night	18% 11% 3 8% 4 3 4 3 4 6% 36%	1900
	11th to 20th	Night	21% 6% 2 6% 4 4 3 4 5% 7% 36%	1875
	21st to end	Night	17% 8% 3 6% 5% 4 4 4 6% 6% 38%	1770
May	1st to 10th	Night	17% 8% 3 7% 5% 5% 4 4 6% 7% 35%	2662
	11th to 20th	Night	12% 6% 2 7% 4 4 5% 4 7% 7% 44%	2506
	21st to end	Night	16% 7% 3 7% 5% 5% 4 3 5% 6% 40%	2743
June	1st to 10th	Night	10% 4 2 7% 4 4 5% 3 7% 7% 47%	1520
	11th to 20th	Night	11% 6% 3 8% 5% 4 4 4 6% 9% 42%	1520
	21st to end	Night	7% 6% 2 5% 4 4 5% 4 6% 9% 47%	1520
July	1st to 10th	Night	14% 6% 2 6% 4 4 4 3 6% 7% 43%	2530
	11th to 20th	Night	5% 3 1 5% 3 3 4 4 7% 9% 55%	2530
	21st to end	Night	6% 6% 2 6% 4 5% 4 4 6% 9% 48%	2750
August	1st to 10th	Night	11% 5% 2 6% 4 4 4 3 6% 8% 47%	2517
	11th to 20th	Night	11% 6% 2 6% 4 4 5% 4 5% 7% 46%	2914
	21st to end	Night	9% 5% 2 6% 5% 4 4 3 6% 7% 48%	3476
September	1st to 10th	Night	9% 5% 2 5% 3 4 4 3 5% 6% 54%	1900
	11th to 20th	Night	12% 5% 1 5% 3 2 4 3 5% 6% 53%	1966
	21st to end	Night	11% 7% 2 5% 4 4 4 4 6% 6% 47%	2090
October	1st to 10th	Night	12% 7% 2 6% 3 4 5% 3 5% 7% 48%	2204
	11th to 20th	Night	15% 8% 3 7% 5% 4 5% 4 5% 6% 38%	2304
	21st to end	Night	18% 10% 2 7% 5% 4 5% 4 5% 7% 33%	2717
November	1st to 10th	Night	14% 9% 3 5% 4 3 4 4 5% 7% 44%	2530
	11th to 20th	Night	14% 10% 4 9% 5% 4 4 4 5% 7% 33%	2493
	21st to end	Night	15% 11% 3 7% 5% 4 4 4 5% 7% 37%	2660
December	1st to 10th	Night	13% 13% 4 10% 5% 4 5% 4 5% 7% 31%	2660
	11th to 20th	Night	13% 15% 5% 10% 6% 5% 4 3 4 5% 30%	3279
	21st to end	Night	21% 19% 5% 11% 5% 3 4 3 4 4 22%	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	56% 6% 15% 15% 7% 1	2528
	11th to 20th	Day	61% 6% 11% 18% 4 1	2530
	21st to end	Day	65% 5% 11% 14% 5%	2783
February	1st to 10th	Day	50% 6% 12% 20% 11% 1	1705
	11th to 20th	Day	47% 6% 11% 24% 11% 2	1797
	21st to end	Day	49% 6% 13% 21% 10% 2	1570
March	1st to 10th	Day	38% 5% 12% 26% 16% 3	3120
	11th to 20th	Day	39% 5% 14% 25% 15% 2	3281
	21st to end	Day	58% 5% 8% 21% 7% 1	4164
April	1st to 10th	Day	53% 6% 11% 19% 11%	2280
	11th to 20th	Day	51% 5% 8% 21% 13% 2	2254
	21st to end	Day	51% 6% 11% 19% 11% 2	2409
May	1st to 10th	Day	42% 6% 11% 24% 16% 1	4273
	11th to 20th	Day	36% 6% 10% 33% 14% 1	4403
	21st to end	Day	42% 7% 10% 22% 16% 2	4837
June	1st to 10th	Day	37% 7% 12% 28% 15% 2	2660
	11th to 20th	Day	40% 7% 13% 25% 15% 1	2660
	21st to end	Day	38% 8% 13% 25% 14% 2	2660
July	1st to 10th	Day	41% 8% 14% 27% 9% 1	4371
	11th to 20th	Day	23% 8% 17% 34% 16% 2	4365
	21st to end	Day	35% 7% 12% 22% 21% 2	4662
August	1st to 10th	Day	37% 8% 16% 27% 12% 1	4408
	11th to 20th	Day	34% 7% 13% 33% 13%	3956
	21st to end	Day	39% 8% 13% 25% 15% 1	4179
September	1st to 10th	Day	37% 7% 13% 26% 16% 1	2280
	11th to 20th	Day	34% 6% 17% 31% 12% 1	2195
	21st to end	Day	41% 6% 13% 29% 11%	2090
October	1st to 10th	Day	25% 4 8% 38% 23% 1	3270
	11th to 20th	Day	42% 5% 9% 27% 15% 1	3092
	21st to end	Day	43% 5% 13% 28% 10%	3081
November	1st to 10th	Day	42% 6% 13% 24% 15% 1	1753
	11th to 20th	Day	53% 5% 13% 19% 8% 1	1682
	21st to end	Day	50% 5% 16% 21% 7% 1	1520
December	1st to 10th	Day	54% 6% 13% 22% 5% 1	1520
	11th to 20th	Day	57% 5% 15% 14% 7% 2	1915
	21st to end	Day	71% 6% 7% 11% 5%	2783
January	1st to 10th	Night	56% 4 10% 20% 9% 1	4428
	11th to 20th	Night	62% 6% 9% 16% 6%	4440
	21st to end	Night	63% 5% 11% 15% 6%	4884
February	1st to 10th	Night	51% 5% 10% 22% 11% 2	2470
	11th to 20th	Night	47% 5% 10% 23% 12% 2	2279
	21st to end	Night	50% 5% 12% 20% 11% 2	1884
March	1st to 10th	Night	40% 5% 15% 28% 11% 3	3733
	11th to 20th	Night	43% 4 11% 25% 17% 1	3709
	21st to end	Night	55% 5% 8% 20% 10% 2	3466
April	1st to 10th	Night	50% 6% 7% 17% 18% 1	1900
	11th to 20th	Night	46% 6% 9% 21% 15% 3	1875
	21st to end	Night	46% 6% 10% 21% 15% 2	1770
May	1st to 10th	Night	44% 8% 15% 16% 16% 1	2689
	11th to 20th	Night	35% 9% 11% 30% 14% 1	2507
	21st to end	Night	43% 8% 12% 17% 16% 4	2751
June	1st to 10th	Night	34% 6% 13% 30% 16% 1	1520
	11th to 20th	Night	38% 6% 11% 25% 18% 1	1520
	21st to end	Night	31% 8% 16% 27% 14% 3	1520
July	1st to 10th	Night	39% 7% 15% 22% 13% 5%	2490
	11th to 20th	Night	21% 8% 16% 35% 17% 2	2482
	21st to end	Night	31% 8% 12% 23% 23% 2	2662
August	1st to 10th	Night	34% 7% 13% 27% 18% 1	2508
	11th to 20th	Night	35% 8% 12% 29% 15% 1	2939
	21st to end	Night	34% 7% 14% 22% 20% 3	3476
September	1st to 10th	Night	31% 6% 11% 29% 22% 1	1900
	11th to 20th	Night	31% 7% 12% 34% 16% 1	1966
	21st to end	Night	35% 7% 11% 30% 15% 1	2090
October	1st to 10th	Night	27% 4 7% 37% 22% 2	3672
	11th to 20th	Night	35% 5% 11% 31% 16% 2	3827
	21st to end	Night	47% 5% 10% 23% 16%	4467
November	1st to 10th	Night	40% 5% 13% 25% 15% 2	2530
	11th to 20th	Night	51% 4 13% 17% 12% 1	2493
	21st to end	Night	47% 6% 15% 24% 7% 1	2660
December	1st to 10th	Night	53% 6% 13% 21% 7% 1	2660
	11th to 20th	Night	57% 5% 12% 17% 8% 1	3281
	21st to end	Night	66% 6% 9% 14% 5%	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	16% 10% 35% 26% 11% 2	270
	11th to 20th	Day	21% 9% 34% 27% 8% 1	270
	21st to end	Day	20% 9% 34% 29% 7% 1	297
February	1st to 10th	Day	14% 13% 37% 27% 7% 2	270
	11th to 20th	Day	16% 18% 39% 19% 9%	270
	21st to end	Day	16% 17% 47% 18% 2	225
March	1st to 10th	Day	20% 14% 37% 22% 7%	270
	11th to 20th	Day	20% 15% 31% 22% 9% 2	270
	21st to end	Day	25% 11% 28% 26% 9% 1	505
April	1st to 10th	Day	25% 13% 32% 23% 7%	460
	11th to 20th	Day	25% 15% 29% 18% 10% 3	452
	21st to end	Day	24% 11% 27% 24% 13% 2	460
May	1st to 10th	Day	18% 12% 32% 27% 9% 1	551
	11th to 20th	Day	18% 11% 29% 28% 11% 4	675
	21st to end	Day	17% 10% 27% 27% 13% 7%	734
June	1st to 10th	Day	11% 9% 29% 30% 17% 5%	680
	11th to 20th	Day	14% 9% 29% 30% 13% 5%	680
	21st to end	Day	12% 9% 28% 31% 17% 4	680
July	1st to 10th	Day	8% 4 20% 32% 27% 9%	671
	11th to 20th	Day	9% 6% 25% 32% 20% 9%	668
	21st to end	Day	8% 4 23% 33% 23% 9%	739
August	1st to 10th	Day	10% 4 24% 29% 23% 10%	676
	11th to 20th	Day	13% 7% 16% 23% 29% 12%	533
	21st to end	Day	14% 7% 22% 25% 23% 10%	539
September	1st to 10th	Day	14% 7% 23% 26% 21% 9%	490
	11th to 20th	Day	12% 3 22% 32% 23% 8%	490
	21st to end	Day	15% 10% 28% 23% 20% 5%	490
October	1st to 10th	Day	16% 12% 25% 26% 16% 5%	371
	11th to 20th	Day	22% 17% 29% 23% 9% 1	300
	21st to end	Day	21% 16% 37% 21% 5% 1	330
November	1st to 10th	Day	16% 13% 34% 25% 10% 2	297
	11th to 20th	Day	16% 16% 40% 17% 10% 1	270
	21st to end	Day	22% 12% 41% 20% 6%	270
December	1st to 10th	Day	17% 15% 43% 19% 6% 1	270
	11th to 20th	Day	23% 15% 36% 20% 5% 1	270
	21st to end	Day	26% 19% 33% 18% 5%	297
January	1st to 10th	Night	17% 11% 35% 29% 8% 1	950
	11th to 20th	Night	21% 10% 36% 26% 6% 1	950
	21st to end	Night	20% 8% 34% 30% 8%	1045
February	1st to 10th	Night	16% 10% 36% 31% 7% 1	950
	11th to 20th	Night	16% 10% 40% 25% 9%	803
	21st to end	Night	21% 11% 36% 28% 4	628
March	1st to 10th	Night	19% 9% 32% 30% 9% 1	760
	11th to 20th	Night	17% 11% 37% 27% 8% 1	708
	21st to end	Night	22% 7% 30% 31% 7% 1	627
April	1st to 10th	Night	23% 9% 36% 26% 6%	570
	11th to 20th	Night	24% 10% 29% 31% 6% 1	563
	21st to end	Night	21% 7% 32% 32% 7% 1	570
May	1st to 10th	Night	22% 7% 33% 30% 7%	570
	11th to 20th	Night	18% 8% 32% 34% 8% 1	561
	21st to end	Night	15% 5% 25% 37% 18%	617
June	1st to 10th	Night	10% 6% 28% 39% 16%	570
	11th to 20th	Night	12% 5% 30% 41% 11% 1	570
	21st to end	Night	9% 5% 25% 44% 16% 1	570
July	1st to 10th	Night	8% 4 19% 45% 23% 2	555
	11th to 20th	Night	8% 4 21% 42% 23% 2	552
	21st to end	Night	6% 3 20% 45% 25% 2	624
August	1st to 10th	Night	9% 2 16% 46% 25% 2	567
	11th to 20th	Night	11% 3 16% 37% 30% 3	564
	21st to end	Night	10% 3 22% 40% 23% 2	627
September	1st to 10th	Night	11% 4 23% 40% 18% 5%	570
	11th to 20th	Night	14% 3 25% 32% 24% 3	636
	21st to end	Night	14% 8% 25% 33% 19% 1	760
October	1st to 10th	Night	15% 8% 27% 30% 19% 1	760
	11th to 20th	Night	20% 11% 33% 28% 9%	760
	21st to end	Night	24% 10% 31% 26% 8% 1	836
November	1st to 10th	Night	18% 9% 35% 27% 9% 1	779
	11th to 20th	Night	19% 15% 37% 23% 5% 1	783
	21st to end	Night	21% 12% 34% 25% 7%	950
December	1st to 10th	Night	20% 10% 39% 24% 6%	950
	11th to 20th	Night	22% 11% 34% 26% 6% 1	950
	21st to end	Night	27% 11% 32% 25% 4	1045

Page generated at 2024-11-07 05:55:48. Version ac07

Copyright © 2024 Attilla Danko.