Fruitland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fruitland clear sky chart from 2005-11-06 to 2025-02-06.

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	12% 7% 2 6% 4 4 4 4 5% 7% 44%	108387
	Night	14% 7% 2 6% 4 4 4 3 5% 6% 45%	110019
Transparency	Day	37% 5% 11% 25% 18% 3	112021
	Night	37% 5% 10% 24% 19% 4	114502
Seeing	Day	14% 8% 23% 27% 19% 8%	15798
	Night	16% 8% 26% 32% 16% 2	25742

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	15% 9% 4 8% 5% 4 4 4 4 5% 38%	3617
	11th to 20th	Day	11% 6% 3 7% 4 4 4 4 5% 7% 45%	3914
	21st to end	Day	19% 9% 3 6% 4 4 4 2 4 6% 40%	4488
February	1st to 10th	Day	16% 12% 2 7% 3 4 4 3 4 6% 39%	1830
	11th to 20th	Day	16% 10% 3 7% 4 4 4 3 4 6% 39%	1848
	21st to end	Day	16% 11% 3 6% 4 4 4 4 5% 7% 36%	1570
March	1st to 10th	Day	20% 11% 3 7% 4 4 4 3 4 4 37%	3120
	11th to 20th	Day	13% 7% 3 5% 3 3 3 3 4 5% 50%	3438
	21st to end	Day	15% 7% 3 6% 4 3 4 3 6% 6% 41%	4087
April	1st to 10th	Day	12% 6% 2 5% 4 4 4 4 6% 7% 45%	2280
	11th to 20th	Day	16% 7% 3 7% 4 4 4 3 4 7% 42%	2254
	21st to end	Day	17% 8% 3 7% 4 5% 4 3 5% 6% 39%	2280
May	1st to 10th	Day	14% 6% 3 7% 6% 6% 5% 4 7% 9% 34%	3883
	11th to 20th	Day	17% 7% 3 6% 4 4 4 4 6% 8% 38%	4135
	21st to end	Day	11% 7% 3 6% 5% 5% 5% 4 5% 8% 41%	4824
June	1st to 10th	Day	9% 5% 2 5% 4 4 5% 5% 6% 9% 46%	2660
	11th to 20th	Day	5% 4 2 5% 5% 5% 5% 4 6% 9% 50%	2660
	21st to end	Day	5% 4 2 4 4 5% 5% 5% 7% 11% 48%	2660
July	1st to 10th	Day	10% 4 2 6% 4 5% 6% 4 7% 10% 42%	4440
	11th to 20th	Day	4 3 2 5% 4 4 5% 5% 7% 11% 51%	4440
	21st to end	Day	8% 7% 3 8% 6% 6% 7% 5% 7% 9% 35%	4578
August	1st to 10th	Day	4 3 1 5% 4 4 5% 4 7% 10% 54%	3922
	11th to 20th	Day	11% 6% 2 6% 4 4 4 4 6% 9% 45%	3729
	21st to end	Day	6% 4 1 4 3 4 4 4 5% 9% 56%	4180
September	1st to 10th	Day	10% 5% 2 6% 5% 3 4 3 6% 7% 48%	2280
	11th to 20th	Day	9% 6% 2 6% 4 4 5% 4 5% 7% 49%	2214
	21st to end	Day	11% 5% 2 5% 3 2 4 3 5% 8% 52%	2090
October	1st to 10th	Day	8% 4 2 4 3 3 3 3 4 7% 60%	1972
	11th to 20th	Day	14% 5% 1 5% 4 3 3 2 5% 5% 53%	1900
	21st to end	Day	18% 6% 2 5% 4 3 3 2 4 5% 47%	2049
November	1st to 10th	Day	11% 6% 2 5% 4 3 3 3 4 6% 53%	1762
	11th to 20th	Day	13% 8% 2 5% 4 3 4 3 4 6% 47%	1800
	21st to end	Day	18% 10% 3 5% 3 3 4 3 5% 5% 43%	1800
December	1st to 10th	Day	11% 9% 2 5% 3 3 3 3 4 6% 50%	2693
	11th to 20th	Day	15% 9% 3 7% 4 4 4 3 5% 5% 41%	3008
	21st to end	Day	25% 15% 4 8% 4 4 3 2 3 4 27%	3982
January	1st to 10th	Night	16% 10% 3 9% 4 4 4 3 5% 5% 36%	6348
	11th to 20th	Night	14% 8% 3 9% 5% 4 4 3 5% 5% 41%	6061
	21st to end	Night	19% 7% 3 6% 4 4 4 3 5% 5% 41%	6490
February	1st to 10th	Night	19% 11% 4 7% 4 4 3 3 4 5% 36%	2460
	11th to 20th	Night	16% 8% 3 7% 4 4 3 3 3 6% 43%	2218
	21st to end	Night	19% 8% 3 6% 5% 4 3 3 4 6% 39%	1884
March	1st to 10th	Night	21% 10% 3 6% 4 3 3 3 5% 4 38%	3733
	11th to 20th	Night	13% 6% 2 6% 3 3 4 3 5% 6% 49%	3549
	21st to end	Night	14% 6% 2 7% 5% 4 5% 3 5% 7% 41%	3544
April	1st to 10th	Night	11% 6% 2 4 3 4 5% 3 5% 7% 49%	1900
	11th to 20th	Night	15% 5% 2 5% 4 4 5% 4 6% 6% 44%	1875
	21st to end	Night	19% 7% 2 5% 4 4 4 3 5% 6% 40%	1900
May	1st to 10th	Night	18% 7% 2 5% 4 3 4 4 5% 9% 40%	3010
	11th to 20th	Night	15% 7% 2 8% 4 4 3 3 5% 7% 43%	2756
	21st to end	Night	9% 6% 2 7% 6% 5% 5% 4 8% 9% 40%	2743
June	1st to 10th	Night	9% 5% 2 5% 5% 5% 5% 4 6% 9% 46%	1520
	11th to 20th	Night	4 3 2 4 4 4 4 4 6% 9% 57%	1520
	21st to end	Night	3 3 1 3 3 4 5% 5% 8% 11% 53%	1520
July	1st to 10th	Night	10% 4 2 5% 4 4 4 4 5% 9% 49%	2530
	11th to 20th	Night	5% 3 2 4 4 4 4 3 5% 8% 57%	2530
	21st to end	Night	6% 9% 3 7% 5% 4 5% 5% 7% 9% 40%	2967
August	1st to 10th	Night	4 3 1 3 3 3 4 4 5% 9% 62%	3008
	11th to 20th	Night	7% 5% 2 5% 4 4 4 3 6% 8% 51%	3100
	21st to end	Night	3 3 2 4 3 4 3 4 6% 9% 59%	3476
September	1st to 10th	Night	9% 6% 2 5% 3 3 4 3 5% 5% 54%	1900
	11th to 20th	Night	8% 5% 2 6% 4 3 4 3 5% 7% 52%	1947
	21st to end	Night	11% 4 2 5% 3 4 3 3 5% 7% 54%	2090
October	1st to 10th	Night	6% 4 1 4 3 4 3 2 5% 6% 62%	2204
	11th to 20th	Night	12% 5% 2 5% 3 2 4 2 4 5% 56%	2280
	21st to end	Night	17% 7% 2 5% 3 3 3 2 3 5% 49%	2546
November	1st to 10th	Night	12% 5% 2 5% 3 2 2 2 5% 6% 56%	2536
	11th to 20th	Night	13% 6% 2 5% 4 3 3 3 4 6% 52%	2600
	21st to end	Night	18% 7% 2 6% 3 2 3 2 3 4 48%	2600
December	1st to 10th	Night	15% 8% 2 6% 4 3 3 3 4 6% 47%	4479
	11th to 20th	Night	17% 8% 2 5% 4 4 4 3 4 6% 45%	5199
	21st to end	Night	24% 12% 4 7% 4 4 4 3 4 5% 30%	6996

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	48% 4 11% 23% 12% 2	3618
	11th to 20th	Day	37% 4 9% 28% 18% 4	3914
	21st to end	Day	47% 3 11% 16% 15% 8%	4488
February	1st to 10th	Day	48% 3 13% 22% 13% 1	1830
	11th to 20th	Day	47% 3 11% 20% 14% 5%	1858
	21st to end	Day	48% 4 10% 21% 12% 5%	1570
March	1st to 10th	Day	52% 4 5% 19% 12% 7%	3120
	11th to 20th	Day	37% 4 10% 28% 16% 6%	3438
	21st to end	Day	42% 5% 15% 24% 14% 1	4087
April	1st to 10th	Day	36% 5% 11% 28% 18% 2	2280
	11th to 20th	Day	44% 3 11% 21% 16% 4	2254
	21st to end	Day	44% 5% 11% 24% 14% 1	2280
May	1st to 10th	Day	44% 8% 13% 23% 11% 1	3918
	11th to 20th	Day	43% 6% 12% 26% 12% 1	4139
	21st to end	Day	39% 7% 11% 22% 21% 1	4837
June	1st to 10th	Day	33% 7% 15% 25% 19% 2	2660
	11th to 20th	Day	29% 6% 12% 29% 22% 3	2660
	21st to end	Day	28% 8% 16% 26% 17% 5%	2660
July	1st to 10th	Day	35% 7% 13% 25% 16% 3	4371
	11th to 20th	Day	24% 8% 13% 35% 16% 2	4365
	21st to end	Day	42% 10% 14% 25% 9% 1	4434
August	1st to 10th	Day	23% 8% 15% 31% 23% 1	3908
	11th to 20th	Day	35% 6% 12% 27% 18% 2	3765
	21st to end	Day	24% 5% 13% 36% 18% 3	4179
September	1st to 10th	Day	34% 5% 10% 26% 20% 4	2280
	11th to 20th	Day	34% 6% 9% 23% 26% 2	2214
	21st to end	Day	31% 5% 8% 27% 26% 3	2090
October	1st to 10th	Day	15% 3 6% 21% 45% 11%	3271
	11th to 20th	Day	22% 3 6% 22% 36% 10%	3140
	21st to end	Day	31% 4 5% 28% 28% 5%	3351
November	1st to 10th	Day	33% 5% 9% 26% 20% 6%	1762
	11th to 20th	Day	39% 4 7% 23% 22% 6%	1800
	21st to end	Day	44% 4 7% 24% 19% 2	1800
December	1st to 10th	Day	36% 3 8% 35% 16% 1	2693
	11th to 20th	Day	44% 4 9% 26% 15% 2	3005
	21st to end	Day	61% 3 11% 15% 8% 2	3982
January	1st to 10th	Night	49% 4 9% 25% 12% 1	6348
	11th to 20th	Night	43% 6% 7% 24% 17% 3	6061
	21st to end	Night	44% 4 9% 22% 17% 3	6490
February	1st to 10th	Night	51% 3 9% 22% 13% 2	2460
	11th to 20th	Night	44% 3 9% 22% 18% 4	2219
	21st to end	Night	46% 4 10% 19% 16% 5%	1884
March	1st to 10th	Night	49% 4 8% 19% 15% 6%	3733
	11th to 20th	Night	35% 6% 11% 23% 19% 7%	3549
	21st to end	Night	41% 6% 12% 29% 11% 1	3544
April	1st to 10th	Night	34% 5% 11% 27% 19% 4	1900
	11th to 20th	Night	38% 5% 9% 23% 20% 5%	1875
	21st to end	Night	45% 5% 8% 25% 15% 3	1900
May	1st to 10th	Night	41% 6% 17% 24% 10% 1	3040
	11th to 20th	Night	41% 7% 13% 21% 17% 1	2757
	21st to end	Night	37% 8% 12% 24% 17% 2	2751
June	1st to 10th	Night	32% 7% 14% 25% 20% 3	1520
	11th to 20th	Night	23% 6% 12% 28% 24% 6%	1520
	21st to end	Night	21% 7% 18% 28% 18% 9%	1520
July	1st to 10th	Night	31% 7% 14% 28% 16% 4	2490
	11th to 20th	Night	24% 6% 11% 37% 18% 4	2482
	21st to end	Night	37% 8% 17% 24% 13% 1	2873
August	1st to 10th	Night	18% 7% 19% 34% 22% 1	2998
	11th to 20th	Night	30% 5% 16% 26% 18% 4	3130
	21st to end	Night	21% 5% 11% 38% 22% 3	3476
September	1st to 10th	Night	31% 6% 7% 29% 21% 6%	1900
	11th to 20th	Night	31% 6% 9% 26% 25% 4	1947
	21st to end	Night	31% 5% 9% 21% 27% 6%	2090
October	1st to 10th	Night	15% 2 6% 17% 44% 16%	3672
	11th to 20th	Night	22% 3 5% 19% 42% 10%	3779
	21st to end	Night	30% 4 6% 25% 28% 8%	4182
November	1st to 10th	Night	30% 3 10% 27% 24% 6%	2536
	11th to 20th	Night	34% 3 7% 25% 23% 7%	2600
	21st to end	Night	41% 3 8% 25% 21% 2	2600
December	1st to 10th	Night	39% 4 10% 28% 18% 1	4479
	11th to 20th	Night	42% 3 12% 21% 20% 1	5201
	21st to end	Night	56% 5% 10% 19% 9% 1	6996

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	27% 13% 31% 22% 6%	300
	11th to 20th	Day	23% 16% 42% 17% 2 1	300
	21st to end	Day	19% 16% 39% 21% 4	330
February	1st to 10th	Day	24% 13% 41% 16% 5%	285
	11th to 20th	Day	23% 21% 34% 18% 4	270
	21st to end	Day	28% 18% 34% 16% 4	225
March	1st to 10th	Day	19% 16% 36% 21% 8%	270
	11th to 20th	Day	24% 17% 38% 17% 3 1	270
	21st to end	Day	24% 15% 32% 23% 7%	454
April	1st to 10th	Day	14% 15% 36% 25% 10% 1	460
	11th to 20th	Day	19% 18% 28% 21% 13% 1	452
	21st to end	Day	19% 12% 29% 28% 9% 2	460
May	1st to 10th	Day	16% 12% 30% 26% 12% 3	463
	11th to 20th	Day	17% 6% 25% 26% 17% 8%	515
	21st to end	Day	11% 6% 23% 33% 20% 8%	734
June	1st to 10th	Day	11% 4 19% 24% 27% 15%	680
	11th to 20th	Day	6% 1 16% 37% 27% 12%	680
	21st to end	Day	6% 3 22% 37% 22% 10%	680
July	1st to 10th	Day	10% 3 11% 27% 27% 22%	671
	11th to 20th	Day	6% 2 12% 33% 32% 15%	668
	21st to end	Day	8% 3 13% 31% 32% 14%	739
August	1st to 10th	Day	9% 2 9% 31% 33% 16%	572
	11th to 20th	Day	14% 3 15% 25% 29% 13%	479
	21st to end	Day	9% 2 7% 26% 37% 19%	539
September	1st to 10th	Day	9% 4 11% 28% 32% 15%	490
	11th to 20th	Day	9% 3 8% 27% 36% 17%	490
	21st to end	Day	13% 8% 16% 26% 25% 11%	490
October	1st to 10th	Day	9% 4 18% 38% 20% 10%	372
	11th to 20th	Day	16% 10% 32% 25% 13% 4	300
	21st to end	Day	24% 13% 30% 25% 8% 1	330
November	1st to 10th	Day	14% 13% 28% 29% 13% 4	300
	11th to 20th	Day	12% 18% 32% 23% 14% 2	300
	21st to end	Day	24% 14% 29% 23% 10% 1	300
December	1st to 10th	Day	17% 15% 32% 23% 10% 3	300
	11th to 20th	Day	24% 14% 31% 22% 9%	300
	21st to end	Day	26% 15% 38% 17% 5%	330
January	1st to 10th	Night	23% 13% 34% 26% 4	1000
	11th to 20th	Night	23% 15% 38% 21% 3	1000
	21st to end	Night	20% 11% 40% 28% 2	1100
February	1st to 10th	Night	24% 14% 35% 24% 3	900
	11th to 20th	Night	21% 16% 35% 25% 3	743
	21st to end	Night	24% 13% 37% 23% 2	628
March	1st to 10th	Night	23% 13% 33% 27% 4	760
	11th to 20th	Night	20% 11% 33% 30% 6%	613
	21st to end	Night	23% 10% 29% 31% 7%	627
April	1st to 10th	Night	14% 11% 38% 31% 7%	570
	11th to 20th	Night	18% 10% 29% 30% 12% 1	563
	21st to end	Night	22% 6% 32% 30% 10% 1	570
May	1st to 10th	Night	16% 5% 28% 38% 12% 2	570
	11th to 20th	Night	16% 4 22% 38% 19% 1	561
	21st to end	Night	8% 3 18% 44% 23% 4	617
June	1st to 10th	Night	12% 3 13% 37% 32% 3	570
	11th to 20th	Night	4 2 11% 51% 30% 2	570
	21st to end	Night	4 2 15% 44% 33% 2	570
July	1st to 10th	Night	9% 2 8% 33% 39% 9%	555
	11th to 20th	Night	5% 3 8% 38% 39% 7%	552
	21st to end	Night	7% 3 10% 35% 40% 5%	624
August	1st to 10th	Night	6% 2 7% 39% 39% 6%	567
	11th to 20th	Night	8% 2 9% 38% 38% 4	564
	21st to end	Night	6% 2 7% 32% 46% 7%	627
September	1st to 10th	Night	12% 2 10% 33% 37% 6%	570
	11th to 20th	Night	10% 3 11% 32% 38% 7%	617
	21st to end	Night	12% 4 17% 33% 30% 4	760
October	1st to 10th	Night	8% 4 21% 38% 26% 4	760
	11th to 20th	Night	14% 7% 28% 32% 18% 2	760
	21st to end	Night	22% 8% 28% 32% 11%	836
November	1st to 10th	Night	15% 6% 30% 36% 13% 1	780
	11th to 20th	Night	17% 9% 32% 31% 10%	800
	21st to end	Night	22% 10% 29% 30% 9%	800
December	1st to 10th	Night	22% 11% 32% 29% 6%	938
	11th to 20th	Night	22% 10% 30% 31% 7% 1	1000
	21st to end	Night	25% 11% 35% 26% 4	1100

Page generated at 2025-02-03 02:05:56. Version ac07

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